To avoid deadlock, do not call blocking functions with spinlocks held.
Replace GFP_KERNEL with GFP_ATOMIC, as the latter will fail if the pile
doesn't have enough free pages but will not sleep and hence deadlock can
be avoided.
Found by Coccinelle.
Signed-off-by: Tapasweni Pathak <tapaswenipathak@xxxxxxxxx>
---
Is there any other way this can be fixed as it is better to avoid GFP_ATOMIC?
drivers/staging/emxx_udc/emxx_udc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/staging/emxx_udc/emxx_udc.c b/drivers/staging/emxx_udc/emxx_udc.c
index 4be646c..6c1de27 100644
--- a/drivers/staging/emxx_udc/emxx_udc.c
+++ b/drivers/staging/emxx_udc/emxx_udc.c
@@ -2794,7 +2794,7 @@ static int nbu2ss_ep_queue(
if (ep->virt_buf == NULL)
ep->virt_buf = (u8 *)dma_alloc_coherent(
NULL, PAGE_SIZE,
- &ep->phys_buf, GFP_KERNEL | GFP_DMA);
+ &ep->phys_buf, GFP_ATOMIC | GFP_DMA);
if (ep->epnum > 0) {
if (ep->direct == USB_DIR_IN)
memcpy(ep->virt_buf, req->req.buf,
--
1.7.9.5
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