Resolves a panic that can occur on AMD systems during host shutdown
where pt_issue_pending() could potentially call pt_cmd_callback()
with a NULL desc pointer.
Ref: Bugzilla Bug 216856.
Fixes: 6fa7e0e836e2 ("dmaengine: ptdma: fix concurrency issue with multiple dma transfer")
Signed-off-by: Eric Pilmore <epilmore@xxxxxxxxxx>
---
drivers/dma/ptdma/ptdma-dmaengine.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/dma/ptdma/ptdma-dmaengine.c b/drivers/dma/ptdma/ptdma-dmaengine.c
index cc22d162ce25..1aa65e5de0f3 100644
--- a/drivers/dma/ptdma/ptdma-dmaengine.c
+++ b/drivers/dma/ptdma/ptdma-dmaengine.c
@@ -254,7 +254,7 @@ static void pt_issue_pending(struct dma_chan *dma_chan)
spin_unlock_irqrestore(&chan->vc.lock, flags);
/* If there was nothing active, start processing */
- if (engine_is_idle)
+ if (engine_is_idle && desc)
pt_cmd_callback(desc, 0);
}
--
2.38.1
