DAC960: split up ioctl function to reduce stack size
When CONFIG_KASAN is set, all the local variables in this function are allocated on the stack together, leading to a warning about possible kernel stack overflow: drivers/block/DAC960.c: In function 'DAC960_gam_ioctl': drivers/block/DAC960.c:7061:1: error: the frame size of 2240 bytes is larger than 2048 bytes [-Werror=frame-larger-than=] By splitting up the function into smaller chunks, we can avoid that and make the code slightly more readable at the same time. The coding style in this file is completely nonstandard, and I chose to not touch that at all, leaving the unconventional intendation unchanged to make it easier to review the diff. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Arnd Bergmann
Jens Axboe
Родитель
cf8c0c6a38
Коммит
91f7b74aca
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@ -6619,43 +6619,27 @@ static void DAC960_DestroyProcEntries(DAC960_Controller_T *Controller)
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#ifdef DAC960_GAM_MINOR
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/*
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* DAC960_gam_ioctl is the ioctl function for performing RAID operations.
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*/
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static long DAC960_gam_ioctl(struct file *file, unsigned int Request,
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unsigned long Argument)
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static long DAC960_gam_get_controller_info(DAC960_ControllerInfo_T __user *UserSpaceControllerInfo)
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{
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long ErrorCode = 0;
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if (!capable(CAP_SYS_ADMIN)) return -EACCES;
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mutex_lock(&DAC960_mutex);
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switch (Request)
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{
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case DAC960_IOCTL_GET_CONTROLLER_COUNT:
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ErrorCode = DAC960_ControllerCount;
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break;
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case DAC960_IOCTL_GET_CONTROLLER_INFO:
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{
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DAC960_ControllerInfo_T __user *UserSpaceControllerInfo =
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(DAC960_ControllerInfo_T __user *) Argument;
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DAC960_ControllerInfo_T ControllerInfo;
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DAC960_Controller_T *Controller;
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int ControllerNumber;
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long ErrorCode;
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if (UserSpaceControllerInfo == NULL)
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ErrorCode = -EINVAL;
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else ErrorCode = get_user(ControllerNumber,
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&UserSpaceControllerInfo->ControllerNumber);
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if (ErrorCode != 0)
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break;
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goto out;
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ErrorCode = -ENXIO;
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if (ControllerNumber < 0 ||
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ControllerNumber > DAC960_ControllerCount - 1) {
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break;
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goto out;
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}
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Controller = DAC960_Controllers[ControllerNumber];
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if (Controller == NULL)
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break;
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goto out;
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memset(&ControllerInfo, 0, sizeof(DAC960_ControllerInfo_T));
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ControllerInfo.ControllerNumber = ControllerNumber;
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ControllerInfo.FirmwareType = Controller->FirmwareType;
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@ -6670,12 +6654,12 @@ static long DAC960_gam_ioctl(struct file *file, unsigned int Request,
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strcpy(ControllerInfo.FirmwareVersion, Controller->FirmwareVersion);
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ErrorCode = (copy_to_user(UserSpaceControllerInfo, &ControllerInfo,
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sizeof(DAC960_ControllerInfo_T)) ? -EFAULT : 0);
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break;
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}
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case DAC960_IOCTL_V1_EXECUTE_COMMAND:
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{
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DAC960_V1_UserCommand_T __user *UserSpaceUserCommand =
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(DAC960_V1_UserCommand_T __user *) Argument;
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out:
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return ErrorCode;
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}
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static long DAC960_gam_v1_execute_command(DAC960_V1_UserCommand_T __user *UserSpaceUserCommand)
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{
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DAC960_V1_UserCommand_T UserCommand;
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DAC960_Controller_T *Controller;
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DAC960_Command_T *Command = NULL;
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@ -6688,39 +6672,41 @@ static long DAC960_gam_ioctl(struct file *file, unsigned int Request,
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int ControllerNumber, DataTransferLength;
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unsigned char *DataTransferBuffer = NULL;
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dma_addr_t DataTransferBufferDMA;
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long ErrorCode;
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if (UserSpaceUserCommand == NULL) {
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ErrorCode = -EINVAL;
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break;
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goto out;
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}
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if (copy_from_user(&UserCommand, UserSpaceUserCommand,
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sizeof(DAC960_V1_UserCommand_T))) {
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ErrorCode = -EFAULT;
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break;
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goto out;
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}
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ControllerNumber = UserCommand.ControllerNumber;
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ErrorCode = -ENXIO;
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if (ControllerNumber < 0 ||
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ControllerNumber > DAC960_ControllerCount - 1)
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break;
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goto out;
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Controller = DAC960_Controllers[ControllerNumber];
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if (Controller == NULL)
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break;
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goto out;
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ErrorCode = -EINVAL;
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if (Controller->FirmwareType != DAC960_V1_Controller)
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break;
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goto out;
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CommandOpcode = UserCommand.CommandMailbox.Common.CommandOpcode;
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DataTransferLength = UserCommand.DataTransferLength;
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if (CommandOpcode & 0x80)
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break;
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goto out;
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if (CommandOpcode == DAC960_V1_DCDB)
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{
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if (copy_from_user(&DCDB, UserCommand.DCDB,
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sizeof(DAC960_V1_DCDB_T))) {
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ErrorCode = -EFAULT;
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break;
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goto out;
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}
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if (DCDB.Channel >= DAC960_V1_MaxChannels)
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break;
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goto out;
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if (!((DataTransferLength == 0 &&
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DCDB.Direction
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== DAC960_V1_DCDB_NoDataTransfer) ||
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@ -6730,15 +6716,15 @@ static long DAC960_gam_ioctl(struct file *file, unsigned int Request,
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(DataTransferLength < 0 &&
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DCDB.Direction
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== DAC960_V1_DCDB_DataTransferSystemToDevice)))
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break;
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goto out;
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if (((DCDB.TransferLengthHigh4 << 16) | DCDB.TransferLength)
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!= abs(DataTransferLength))
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break;
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goto out;
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DCDB_IOBUF = pci_alloc_consistent(Controller->PCIDevice,
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sizeof(DAC960_V1_DCDB_T), &DCDB_IOBUFDMA);
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if (DCDB_IOBUF == NULL) {
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ErrorCode = -ENOMEM;
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break;
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goto out;
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}
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}
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ErrorCode = -ENOMEM;
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@ -6748,19 +6734,19 @@ static long DAC960_gam_ioctl(struct file *file, unsigned int Request,
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DataTransferLength,
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&DataTransferBufferDMA);
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if (DataTransferBuffer == NULL)
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break;
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goto out;
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}
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else if (DataTransferLength < 0)
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{
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DataTransferBuffer = pci_alloc_consistent(Controller->PCIDevice,
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-DataTransferLength, &DataTransferBufferDMA);
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if (DataTransferBuffer == NULL)
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break;
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goto out;
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if (copy_from_user(DataTransferBuffer,
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UserCommand.DataTransferBuffer,
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-DataTransferLength)) {
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ErrorCode = -EFAULT;
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break;
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goto out;
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}
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}
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if (CommandOpcode == DAC960_V1_DCDB)
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@ -6837,12 +6823,12 @@ static long DAC960_gam_ioctl(struct file *file, unsigned int Request,
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if (DCDB_IOBUF != NULL)
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pci_free_consistent(Controller->PCIDevice, sizeof(DAC960_V1_DCDB_T),
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DCDB_IOBUF, DCDB_IOBUFDMA);
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break;
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}
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case DAC960_IOCTL_V2_EXECUTE_COMMAND:
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{
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DAC960_V2_UserCommand_T __user *UserSpaceUserCommand =
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(DAC960_V2_UserCommand_T __user *) Argument;
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out:
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return ErrorCode;
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}
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static long DAC960_gam_v2_execute_command(DAC960_V2_UserCommand_T __user *UserSpaceUserCommand)
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{
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DAC960_V2_UserCommand_T UserCommand;
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DAC960_Controller_T *Controller;
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DAC960_Command_T *Command = NULL;
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@ -6855,26 +6841,26 @@ static long DAC960_gam_ioctl(struct file *file, unsigned int Request,
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dma_addr_t DataTransferBufferDMA;
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unsigned char *RequestSenseBuffer = NULL;
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dma_addr_t RequestSenseBufferDMA;
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long ErrorCode = -EINVAL;
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ErrorCode = -EINVAL;
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if (UserSpaceUserCommand == NULL)
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break;
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goto out;
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if (copy_from_user(&UserCommand, UserSpaceUserCommand,
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sizeof(DAC960_V2_UserCommand_T))) {
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ErrorCode = -EFAULT;
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break;
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goto out;
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}
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ErrorCode = -ENXIO;
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ControllerNumber = UserCommand.ControllerNumber;
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if (ControllerNumber < 0 ||
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ControllerNumber > DAC960_ControllerCount - 1)
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break;
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goto out;
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Controller = DAC960_Controllers[ControllerNumber];
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if (Controller == NULL)
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break;
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goto out;
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if (Controller->FirmwareType != DAC960_V2_Controller){
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ErrorCode = -EINVAL;
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break;
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goto out;
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}
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DataTransferLength = UserCommand.DataTransferLength;
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ErrorCode = -ENOMEM;
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@ -6884,14 +6870,14 @@ static long DAC960_gam_ioctl(struct file *file, unsigned int Request,
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DataTransferLength,
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&DataTransferBufferDMA);
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if (DataTransferBuffer == NULL)
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break;
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goto out;
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}
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else if (DataTransferLength < 0)
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{
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DataTransferBuffer = pci_alloc_consistent(Controller->PCIDevice,
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-DataTransferLength, &DataTransferBufferDMA);
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if (DataTransferBuffer == NULL)
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break;
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goto out;
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if (copy_from_user(DataTransferBuffer,
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UserCommand.DataTransferBuffer,
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-DataTransferLength)) {
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@ -7001,42 +6987,44 @@ static long DAC960_gam_ioctl(struct file *file, unsigned int Request,
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if (RequestSenseBuffer != NULL)
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pci_free_consistent(Controller->PCIDevice, RequestSenseLength,
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RequestSenseBuffer, RequestSenseBufferDMA);
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break;
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}
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case DAC960_IOCTL_V2_GET_HEALTH_STATUS:
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{
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DAC960_V2_GetHealthStatus_T __user *UserSpaceGetHealthStatus =
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(DAC960_V2_GetHealthStatus_T __user *) Argument;
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out:
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return ErrorCode;
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}
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static long DAC960_gam_v2_get_health_status(DAC960_V2_GetHealthStatus_T __user *UserSpaceGetHealthStatus)
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{
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DAC960_V2_GetHealthStatus_T GetHealthStatus;
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DAC960_V2_HealthStatusBuffer_T HealthStatusBuffer;
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DAC960_Controller_T *Controller;
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int ControllerNumber;
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long ErrorCode;
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if (UserSpaceGetHealthStatus == NULL) {
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ErrorCode = -EINVAL;
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break;
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goto out;
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}
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if (copy_from_user(&GetHealthStatus, UserSpaceGetHealthStatus,
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sizeof(DAC960_V2_GetHealthStatus_T))) {
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ErrorCode = -EFAULT;
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break;
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goto out;
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}
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ErrorCode = -ENXIO;
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ControllerNumber = GetHealthStatus.ControllerNumber;
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if (ControllerNumber < 0 ||
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ControllerNumber > DAC960_ControllerCount - 1)
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break;
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goto out;
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Controller = DAC960_Controllers[ControllerNumber];
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if (Controller == NULL)
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break;
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goto out;
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if (Controller->FirmwareType != DAC960_V2_Controller) {
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ErrorCode = -EINVAL;
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break;
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goto out;
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}
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if (copy_from_user(&HealthStatusBuffer,
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GetHealthStatus.HealthStatusBuffer,
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sizeof(DAC960_V2_HealthStatusBuffer_T))) {
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ErrorCode = -EFAULT;
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break;
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goto out;
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}
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ErrorCode = wait_event_interruptible_timeout(Controller->HealthStatusWaitQueue,
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!(Controller->V2.HealthStatusBuffer->StatusChangeCounter
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@ -7046,7 +7034,7 @@ static long DAC960_gam_ioctl(struct file *file, unsigned int Request,
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DAC960_MonitoringTimerInterval);
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if (ErrorCode == -ERESTARTSYS) {
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ErrorCode = -EINTR;
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break;
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goto out;
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}
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if (copy_to_user(GetHealthStatus.HealthStatusBuffer,
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Controller->V2.HealthStatusBuffer,
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@ -7054,7 +7042,39 @@ static long DAC960_gam_ioctl(struct file *file, unsigned int Request,
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ErrorCode = -EFAULT;
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else
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ErrorCode = 0;
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}
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out:
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return ErrorCode;
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}
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/*
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* DAC960_gam_ioctl is the ioctl function for performing RAID operations.
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*/
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static long DAC960_gam_ioctl(struct file *file, unsigned int Request,
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unsigned long Argument)
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{
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long ErrorCode = 0;
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void __user *argp = (void __user *)Argument;
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if (!capable(CAP_SYS_ADMIN)) return -EACCES;
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mutex_lock(&DAC960_mutex);
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switch (Request)
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{
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case DAC960_IOCTL_GET_CONTROLLER_COUNT:
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ErrorCode = DAC960_ControllerCount;
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break;
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case DAC960_IOCTL_GET_CONTROLLER_INFO:
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ErrorCode = DAC960_gam_get_controller_info(argp);
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break;
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case DAC960_IOCTL_V1_EXECUTE_COMMAND:
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ErrorCode = DAC960_gam_v1_execute_command(argp);
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break;
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case DAC960_IOCTL_V2_EXECUTE_COMMAND:
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ErrorCode = DAC960_gam_v2_execute_command(argp);
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break;
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case DAC960_IOCTL_V2_GET_HEALTH_STATUS:
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ErrorCode = DAC960_gam_v2_get_health_status(argp);
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break;
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default:
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ErrorCode = -ENOTTY;
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