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WSL2-Linux-Kernel
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Staging: hv: Use only one txf buffer per channel and kmalloc/GFP_KERNEL on initialize 

Correct issue with not checking kmalloc return value.
This fix now only uses one receive buffer for all hv_utils
channels, and will do only one kmalloc on init and will return
with a -ENOMEM if kmalloc fails on initialize.

And properly clean up memory on failure.

Thanks to Evgeniy Polyakov <zbr@ioremap.net> for pointing this out.
And thanks to Jesper Juhl <jj@chaosbits.net> and Ky Srinivasan
<ksrinivasan@novell.com> for suggesting a better implementation of
my original patch.

Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
Reviewed-by: Jesper Juhl <jj@chaosbits.net>
Cc: Evgeniy Polyakov <zbr@ioremap.net>
Cc: Jesper Juhl <jj@chaosbits.net>
Cc: Ky Srinivasan <ksrinivasan@novell.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Hank Janssen 2010-12-13 16:23:36 -08:00 коммит произвёл Greg Kroah-Hartman
Родитель 244ba85606
Коммит 45241e50e3
1 изменённых файлов: 47 добавлений и 40 удалений
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87
drivers/staging/hv/hv_utils.c
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@ -38,12 +38,14 @@
#include "vmbus_api.h"
#include "utils.h"
static u8 *shut_txf_buf;
static u8 *time_txf_buf;
static u8 *hbeat_txf_buf;
static void shutdown_onchannelcallback(void *context)
{
struct vmbus_channel *channel = context;
u8 *buf;
u32 buflen, recvlen;
u32 recvlen;
u64 requestid;
u8 execute_shutdown = false;
@ -52,24 +54,23 @@ static void shutdown_onchannelcallback(void *context)
struct icmsg_hdr *icmsghdrp;
struct icmsg_negotiate *negop = NULL;
buflen = PAGE_SIZE;
buf = kmalloc(buflen, GFP_ATOMIC);
vmbus_recvpacket(channel, buf, buflen, &recvlen, &requestid);
vmbus_recvpacket(channel, shut_txf_buf,
PAGE_SIZE, &recvlen, &requestid);
if (recvlen > 0) {
DPRINT_DBG(VMBUS, "shutdown packet: len=%d, requestid=%lld",
recvlen, requestid);
icmsghdrp = (struct icmsg_hdr *)&buf[
icmsghdrp = (struct icmsg_hdr *)&shut_txf_buf[
sizeof(struct vmbuspipe_hdr)];
if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
prep_negotiate_resp(icmsghdrp, negop, buf);
prep_negotiate_resp(icmsghdrp, negop, shut_txf_buf);
} else {
shutdown_msg = (struct shutdown_msg_data *)&buf[
sizeof(struct vmbuspipe_hdr) +
sizeof(struct icmsg_hdr)];
shutdown_msg =
(struct shutdown_msg_data *)&shut_txf_buf[
sizeof(struct vmbuspipe_hdr) +
sizeof(struct icmsg_hdr)];
switch (shutdown_msg->flags) {
case 0:
@ -93,13 +94,11 @@ static void shutdown_onchannelcallback(void *context)
icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
| ICMSGHDRFLAG_RESPONSE;
vmbus_sendpacket(channel, buf,
vmbus_sendpacket(channel, shut_txf_buf,
recvlen, requestid,
VmbusPacketTypeDataInBand, 0);
}
kfree(buf);
if (execute_shutdown == true)
orderly_poweroff(false);
}
@ -150,28 +149,25 @@ static inline void adj_guesttime(u64 hosttime, u8 flags)
static void timesync_onchannelcallback(void *context)
{
struct vmbus_channel *channel = context;
u8 *buf;
u32 buflen, recvlen;
u32 recvlen;
u64 requestid;
struct icmsg_hdr *icmsghdrp;
struct ictimesync_data *timedatap;
buflen = PAGE_SIZE;
buf = kmalloc(buflen, GFP_ATOMIC);
vmbus_recvpacket(channel, buf, buflen, &recvlen, &requestid);
vmbus_recvpacket(channel, time_txf_buf,
PAGE_SIZE, &recvlen, &requestid);
if (recvlen > 0) {
DPRINT_DBG(VMBUS, "timesync packet: recvlen=%d, requestid=%lld",
recvlen, requestid);
icmsghdrp = (struct icmsg_hdr *)&buf[
icmsghdrp = (struct icmsg_hdr *)&time_txf_buf[
sizeof(struct vmbuspipe_hdr)];
if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
prep_negotiate_resp(icmsghdrp, NULL, buf);
prep_negotiate_resp(icmsghdrp, NULL, time_txf_buf);
} else {
timedatap = (struct ictimesync_data *)&buf[
timedatap = (struct ictimesync_data *)&time_txf_buf[
sizeof(struct vmbuspipe_hdr) +
sizeof(struct icmsg_hdr)];
adj_guesttime(timedatap->parenttime, timedatap->flags);
@ -180,12 +176,10 @@ static void timesync_onchannelcallback(void *context)
icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
| ICMSGHDRFLAG_RESPONSE;
vmbus_sendpacket(channel, buf,
vmbus_sendpacket(channel, time_txf_buf,
recvlen, requestid,
VmbusPacketTypeDataInBand, 0);
}
kfree(buf);
}
/*
@ -196,30 +190,28 @@ static void timesync_onchannelcallback(void *context)
static void heartbeat_onchannelcallback(void *context)
{
struct vmbus_channel *channel = context;
u8 *buf;
u32 buflen, recvlen;
u32 recvlen;
u64 requestid;
struct icmsg_hdr *icmsghdrp;
struct heartbeat_msg_data *heartbeat_msg;
buflen = PAGE_SIZE;
buf = kmalloc(buflen, GFP_ATOMIC);
vmbus_recvpacket(channel, buf, buflen, &recvlen, &requestid);
vmbus_recvpacket(channel, hbeat_txf_buf,
PAGE_SIZE, &recvlen, &requestid);
if (recvlen > 0) {
DPRINT_DBG(VMBUS, "heartbeat packet: len=%d, requestid=%lld",
recvlen, requestid);
icmsghdrp = (struct icmsg_hdr *)&buf[
icmsghdrp = (struct icmsg_hdr *)&hbeat_txf_buf[
sizeof(struct vmbuspipe_hdr)];
if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
prep_negotiate_resp(icmsghdrp, NULL, buf);
prep_negotiate_resp(icmsghdrp, NULL, hbeat_txf_buf);
} else {
heartbeat_msg = (struct heartbeat_msg_data *)&buf[
sizeof(struct vmbuspipe_hdr) +
sizeof(struct icmsg_hdr)];
heartbeat_msg =
(struct heartbeat_msg_data *)&hbeat_txf_buf[
sizeof(struct vmbuspipe_hdr) +
sizeof(struct icmsg_hdr)];
DPRINT_DBG(VMBUS, "heartbeat seq = %lld",
heartbeat_msg->seq_num);
@ -230,12 +222,10 @@ static void heartbeat_onchannelcallback(void *context)
icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
| ICMSGHDRFLAG_RESPONSE;
vmbus_sendpacket(channel, buf,
vmbus_sendpacket(channel, hbeat_txf_buf,
recvlen, requestid,
VmbusPacketTypeDataInBand, 0);
}
kfree(buf);
}
static const struct pci_device_id __initconst
@ -268,6 +258,19 @@ static int __init init_hyperv_utils(void)
if (!dmi_check_system(hv_utils_dmi_table))
return -ENODEV;
shut_txf_buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
time_txf_buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
hbeat_txf_buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
if (!shut_txf_buf || !time_txf_buf || !hbeat_txf_buf) {
printk(KERN_INFO
"Unable to allocate memory for receive buffer\n");
kfree(shut_txf_buf);
kfree(time_txf_buf);
kfree(hbeat_txf_buf);
return -ENOMEM;
}
hv_cb_utils[HV_SHUTDOWN_MSG].channel->onchannel_callback =
&shutdown_onchannelcallback;
hv_cb_utils[HV_SHUTDOWN_MSG].callback = &shutdown_onchannelcallback;
@ -298,6 +301,10 @@ static void exit_hyperv_utils(void)
hv_cb_utils[HV_HEARTBEAT_MSG].channel->onchannel_callback =
&chn_cb_negotiate;
hv_cb_utils[HV_HEARTBEAT_MSG].callback = &chn_cb_negotiate;
kfree(shut_txf_buf);
kfree(time_txf_buf);
kfree(hbeat_txf_buf);
}
module_init(init_hyperv_utils);