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authorFinn Thain <fthain@telegraphics.com.au>2016-01-03 16:05:28 +1100
committerMartin K. Petersen <martin.petersen@oracle.com>2016-01-06 21:42:57 -0500
commit9dafbd939a224b96868fd8db6909662a4cab5957 (patch)
treecdaa712ac1b35dea2f91e8f88f8f8c286dbda157 /drivers/scsi/NCR5380.c
parenta2edc4a63b4f89016053fe5da3fdac3798f3e2ae (diff)
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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>
Diffstat (limited to 'drivers/scsi/NCR5380.c')
-rw-r--r--drivers/scsi/NCR5380.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/scsi/NCR5380.c b/drivers/scsi/NCR5380.c
index 9b437e19b7a1..b46efaf1fffb 100644
--- a/drivers/scsi/NCR5380.c
+++ b/drivers/scsi/NCR5380.c
@@ -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;