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From: Dave Jiang <dave.jiang@intel.com>
To: vkoul@kernel.org
Cc: dmaengine@vger.kernel.org
Subject: [PATCH] dmaengine: idxd: add missing percpu ref put on failure
Date: Thu, 24 Jun 2021 12:08:21 -0700	[thread overview]
Message-ID: <162456170168.1121236.7240941044089212312.stgit@djiang5-desk3.ch.intel.com> (raw)

When enqcmds() fails, exit path is missing a percpu_ref_put(). This can
cause failure on shutdown path when the driver is attempting to quiesce the
wq. Add missing percpu_ref_put() call on the error exit path.

Fixes: 93a40a6d7428 ("dmaengine: idxd: add percpu_ref to descriptor submission path")
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
---
 drivers/dma/idxd/submit.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/idxd/submit.c b/drivers/dma/idxd/submit.c
index 19afb62abaff..b0f1ddf75d31 100644
--- a/drivers/dma/idxd/submit.c
+++ b/drivers/dma/idxd/submit.c
@@ -118,8 +118,10 @@ int idxd_submit_desc(struct idxd_wq *wq, struct idxd_desc *desc)
 		 * device is not accepting descriptor at all.
 		 */
 		rc = enqcmds(portal, desc->hw);
-		if (rc < 0)
+		if (rc < 0) {
+			percpu_ref_put(&wq->wq_active);
 			return rc;
+		}
 	}
 
 	percpu_ref_put(&wq->wq_active);



             reply	other threads:[~2021-06-24 19:08 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-24 19:08 Dave Jiang [this message]
2021-07-14  6:58 ` [PATCH] dmaengine: idxd: add missing percpu ref put on failure Vinod Koul

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