From: Tejun Heo Date: Wed, 14 Apr 2010 23:57:37 +0000 (+0900) Subject: libata: fix locking around blk_abort_request() X-Git-Tag: v2.6.34-rc6~59^2~3 X-Git-Url: https://bbs.cooldavid.org/git/?a=commitdiff_plain;h=fa41efdae7de61191a7bda3a00e88ef69afb5bb9;p=net-next-2.6.git libata: fix locking around blk_abort_request() blk_abort_request() expectes queue lock to be held by the caller. Grab it before calling the function. Lack of this synchronization led to infinite loop on corrupt q->timeout_list. Signed-off-by: Tejun Heo Cc: Jens Axboe Cc: stable@kernel.org Signed-off-by: Jeff Garzik --- diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c index 9f6cfac0f2c..9e18cc9be0d 100644 --- a/drivers/ata/libata-eh.c +++ b/drivers/ata/libata-eh.c @@ -879,6 +879,8 @@ static void ata_eh_set_pending(struct ata_port *ap, int fastdrain) void ata_qc_schedule_eh(struct ata_queued_cmd *qc) { struct ata_port *ap = qc->ap; + struct request_queue *q = qc->scsicmd->device->request_queue; + unsigned long flags; WARN_ON(!ap->ops->error_handler); @@ -890,7 +892,9 @@ void ata_qc_schedule_eh(struct ata_queued_cmd *qc) * Note that ATA_QCFLAG_FAILED is unconditionally set after * this function completes. */ + spin_lock_irqsave(q->queue_lock, flags); blk_abort_request(qc->scsicmd->request); + spin_unlock_irqrestore(q->queue_lock, flags); } /**