[PATCH] dmaengine: idxd: fix wq slot allocation index check

[PATCH] dmaengine: idxd: fix wq slot allocation index check

[Dave Jiang]

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();
 	}

Re: [PATCH] dmaengine: idxd: fix wq slot allocation index check

[Vinod Koul]

On 22-07-21, 10:54, Dave Jiang wrote:
> 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.

Applied, thanks

-- 
~Vinod