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ncr5380: Add missing lock in eh_abort_handler 

The host spin lock needs to be acquired by NCR5380_abort() before it calls
NCR5380_select(). This patch doesn't actually fix the EH issues in this
driver but it does avoid this:

BUG: spinlock already unlocked on CPU#0, kworker/u4:1/14
 lock: 0xc0c0f834, .magic: dead4ead, .owner: <none>/-1, .owner_cpu: -1
 CPU: 0 PID: 14 Comm: kworker/u4:1 Not tainted 3.15.5 #5
 Workqueue: scsi_tmf_4 scmd_eh_abort_handler
 Call Trace:
 [ef885d70] [c0008acc] show_stack+0x70/0x1bc (unreliable)
 [ef885db0] [c0492a00] dump_stack+0x84/0x684
 [ef885dc0] [c006f314] spin_dump+0xd0/0xe8
 [ef885dd0] [c006f460] do_raw_spin_unlock+0xd4/0xd8
 [ef885df0] [c0491c8c] _raw_spin_unlock_irq+0x10/0x3c
 [ef885e00] [f381fe3c] NCR5380_select+0x3e4/0x6e8 [dmx3191d]
 [ef885e40] [f382026c] NCR5380_abort+0x12c/0x190 [dmx3191d]
 [ef885e60] [c02fec9c] scmd_eh_abort_handler+0x100/0x460
 [ef885e80] [c0046470] process_one_work+0x16c/0x420
 [ef885ea0] [c0046870] worker_thread+0x14c/0x430
 [ef885ed0] [c004e4f4] kthread+0xd8/0xec
 [ef885f40] [c00124d4] ret_from_kernel_thread+0x5c/0x64

Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Tested-by: Ondrej Zary <linux@rainbow-software.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Finn Thain 2016-01-03 16:05:28 +11:00 коммит произвёл Martin K. Petersen
Родитель a2edc4a63b
Коммит 9dafbd939a
1 изменённых файлов: 8 добавлений и 1 удалений
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9
drivers/scsi/NCR5380.c
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@ -2374,6 +2374,7 @@ static int NCR5380_abort(struct scsi_cmnd *cmd)
scmd_printk(KERN_WARNING, cmd, "aborting command\n");
spin_lock_irq(instance->host_lock);
NCR5380_print_status(instance);
dprintk(NDEBUG_ABORT, "scsi%d : abort called\n", instance->host_no);
@ -2420,6 +2421,7 @@ static int NCR5380_abort(struct scsi_cmnd *cmd)
REMOVE(5, *prev, tmp, tmp->host_scribble);
(*prev) = (struct scsi_cmnd *) tmp->host_scribble;
tmp->host_scribble = NULL;
spin_unlock_irq(instance->host_lock);
tmp->result = DID_ABORT << 16;
dprintk(NDEBUG_ABORT, "scsi%d : abort removed command from issue queue.\n", instance->host_no);
tmp->scsi_done(tmp);
@ -2443,6 +2445,7 @@ static int NCR5380_abort(struct scsi_cmnd *cmd)
*/
if (hostdata->connected) {
spin_unlock_irq(instance->host_lock);
dprintk(NDEBUG_ABORT, "scsi%d : abort failed, command connected.\n", instance->host_no);
return FAILED;
}
@ -2475,8 +2478,10 @@ static int NCR5380_abort(struct scsi_cmnd *cmd)
if (cmd == tmp) {
dprintk(NDEBUG_ABORT, "scsi%d : aborting disconnected command.\n", instance->host_no);
if (NCR5380_select(instance, cmd))
if (NCR5380_select(instance, cmd)) {
spin_unlock_irq(instance->host_lock);
return FAILED;
}
dprintk(NDEBUG_ABORT, "scsi%d : nexus reestablished.\n", instance->host_no);
do_abort(instance);
@ -2486,6 +2491,7 @@ static int NCR5380_abort(struct scsi_cmnd *cmd)
REMOVE(5, *prev, tmp, tmp->host_scribble);
*prev = (struct scsi_cmnd *) tmp->host_scribble;
tmp->host_scribble = NULL;
spin_unlock_irq(instance->host_lock);
tmp->result = DID_ABORT << 16;
tmp->scsi_done(tmp);
return SUCCESS;
@ -2500,6 +2506,7 @@ static int NCR5380_abort(struct scsi_cmnd *cmd)
* so we won't panic, but we will notify the user in case something really
* broke.
*/
spin_unlock_irq(instance->host_lock);
printk(KERN_WARNING "scsi%d : warning : SCSI command probably completed successfully\n"
" before abortion\n", instance->host_no);
return FAILED;