[PATCH 1/4] dmaengine: bcm-sba-raid: serialize dma_cookie_complete() using reqs_lock

[Anup Patel]

As-per documentation in driver/dma/dmaengine.h, the
dma_cookie_complete() API should be called with lock
held.

This patch ensures that Broadcom SBA RAID driver calls
the dma_cookie_complete() API with reqs_lock held.

Signed-off-by: Anup Patel <anup.pa...@broadcom.com>
Reviewed-by: Ray Jui <ray....@broadcom.com>
Reviewed-by: Scott Branden <scott.bran...@broadcom.com>
---
 drivers/dma/bcm-sba-raid.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/dma/bcm-sba-raid.c b/drivers/dma/bcm-sba-raid.c
index 6c2c447..15c5585 100644
--- a/drivers/dma/bcm-sba-raid.c
+++ b/drivers/dma/bcm-sba-raid.c
@@ -442,7 +442,9 @@ static void sba_process_received_request(struct sba_device 
*sba,
 
                WARN_ON(tx->cookie < 0);
                if (tx->cookie > 0) {
+                       spin_lock_irqsave(&sba->reqs_lock, flags);
                        dma_cookie_complete(tx);
+                       spin_unlock_irqrestore(&sba->reqs_lock, flags);
                        dmaengine_desc_get_callback_invoke(tx, NULL);
                        dma_descriptor_unmap(tx);
                        tx->callback = NULL;
-- 
2.7.4