From: Mike Christie Date: Thu, 7 Oct 2010 05:51:17 +0000 (-0700) Subject: [SCSI] qla4xxx: grab hardware_lock in eh_abort before accessing srb X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=92b3e5bbbebe86dd0071ccf23c1b21031f74bf56;p=linux-beck.git [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 Signed-off-by: Vikas Chaudhary Signed-off-by: Ravi Anand Reviewed-by: Mike Christie Signed-off-by: James Bottomley --- diff --git a/drivers/scsi/qla4xxx/ql4_os.c b/drivers/scsi/qla4xxx/ql4_os.c index 4b6cdb68a52a..f1c58eb26ba2 100644 --- a/drivers/scsi/qla4xxx/ql4_os.c +++ b/drivers/scsi/qla4xxx/ql4_os.c @@ -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",