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[SCSI] qla4xxx: grab hardware_lock in eh_abort before accessing srb 

grab hardware_lock in eh_abort before accessing srb to avoid
race between command completion and get refcount on srb.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: Vikas Chaudhary <vikas.chaudhary@qlogic.com>
Signed-off-by: Ravi Anand <ravi.anand@qlogic.com>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Mike Christie 2010-10-06 22:51:17 -07:00 committed by James Bottomley
parent d64eab764a
commit 92b3e5bbbe
1 changed files with 6 additions and 3 deletions
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9
drivers/scsi/qla4xxx/ql4_os.c
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@ -2006,6 +2006,7 @@ static int qla4xxx_eh_abort(struct scsi_cmnd *cmd)
unsigned int id = cmd->device->id;
unsigned int lun = cmd->device->lun;
unsigned long serial = cmd->serial_number;
unsigned long flags;
struct srb *srb = NULL;
int ret = SUCCESS;
int wait = 0;
@ -2014,12 +2015,14 @@ static int qla4xxx_eh_abort(struct scsi_cmnd *cmd)
"scsi%ld:%d:%d: Abort command issued cmd=%p, pid=%ld\n",
ha->host_no, id, lun, cmd, serial);
spin_lock_irqsave(&ha->hardware_lock, flags);
srb = (struct srb *) CMD_SP(cmd);
if (!srb)
if (!srb) {
spin_unlock_irqrestore(&ha->hardware_lock, flags);
return SUCCESS;
}
kref_get(&srb->srb_ref);
spin_unlock_irqrestore(&ha->hardware_lock, flags);
if (qla4xxx_abort_task(ha, srb) != QLA_SUCCESS) {
DEBUG3(printk("scsi%ld:%d:%d: Abort_task mbx failed.\n",