From 74665016086615bbaa3fa6f83af410a0a4e029ee Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Wed, 22 Jan 2014 15:29:29 +0100 Subject: scsi: convert host_busy to atomic_t Avoid taking the host-wide host_lock to check the per-host queue limit. Instead we do an atomic_inc_return early on to grab our slot in the queue, and if necessary decrement it after finishing all checks. Signed-off-by: Christoph Hellwig Reviewed-by: Martin K. Petersen Reviewed-by: Hannes Reinecke Reviewed-by: Webb Scales Acked-by: Jens Axboe Tested-by: Bart Van Assche Tested-by: Robert Elliott --- drivers/scsi/qlogicpti.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/scsi/qlogicpti.c') diff --git a/drivers/scsi/qlogicpti.c b/drivers/scsi/qlogicpti.c index 6d48d30bed05..740ae495aa77 100644 --- a/drivers/scsi/qlogicpti.c +++ b/drivers/scsi/qlogicpti.c @@ -959,7 +959,7 @@ static inline void update_can_queue(struct Scsi_Host *host, u_int in_ptr, u_int /* Temporary workaround until bug is found and fixed (one bug has been found already, but fixing it makes things even worse) -jj */ int num_free = QLOGICPTI_REQ_QUEUE_LEN - REQ_QUEUE_DEPTH(in_ptr, out_ptr) - 64; - host->can_queue = host->host_busy + num_free; + host->can_queue = atomic_read(&host->host_busy) + num_free; host->sg_tablesize = QLOGICPTI_MAX_SG(num_free); } -- cgit v1.2.3