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From: Dave Jiang <dave.jiang@intel.com>
To: vkoul@kernel.org
Cc: dmaengine@vger.kernel.org
Subject: [PATCH] dmaengine: idxd: fix wq slot allocation index check
Date: Thu, 22 Jul 2021 10:54:10 -0700	[thread overview]
Message-ID: <162697645067.3478714.506720687816951762.stgit@djiang5-desk3.ch.intel.com> (raw)

The sbitmap wait and allocate routine checks the index that is returned
from sbitmap_queue_get(). It should be idxd >= 0 as 0 is also a valid
index. This fixes issue where submission path hangs when WQ size is 1.

Fixes: 0705107fcc80 ("dmaengine: idxd: move submission to sbitmap_queue")
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
---
 drivers/dma/idxd/submit.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/dma/idxd/submit.c b/drivers/dma/idxd/submit.c
index 36c9c1a89b7e..196d6cf11965 100644
--- a/drivers/dma/idxd/submit.c
+++ b/drivers/dma/idxd/submit.c
@@ -67,7 +67,7 @@ struct idxd_desc *idxd_alloc_desc(struct idxd_wq *wq, enum idxd_op_type optype)
 		if (signal_pending_state(TASK_INTERRUPTIBLE, current))
 			break;
 		idx = sbitmap_queue_get(sbq, &cpu);
-		if (idx > 0)
+		if (idx >= 0)
 			break;
 		schedule();
 	}



             reply	other threads:[~2021-07-22 17:54 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-22 17:54 Dave Jiang [this message]
2021-07-28 12:28 ` Vinod Koul

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