On 10/29/2015 10:36 AM, Peter Chen wrote:
Hi,
It is due to try to allocate memory with GFP_KERNEL at ISR, below change
can fix it, if not better solution, I can submit a patch.
diff --git a/drivers/usb/gadget/function/f_loopback.c
b/drivers/usb/gadget/function/f_loopback.c
index 6b2102b..d2524a1 100644
--- a/drivers/usb/gadget/function/f_loopback.c
+++ b/drivers/usb/gadget/function/f_loopback.c
@@ -329,7 +329,7 @@ static int alloc_requests(struct usb_composite_dev *cdev,
for (i = 0; i < loop->qlen && result == 0; i++) {
result = -ENOMEM;
- in_req = usb_ep_alloc_request(loop->in_ep, GFP_KERNEL);
+ in_req = usb_ep_alloc_request(loop->in_ep, GFP_ATOMIC);
if (!in_req)
Well... I didn't get this error on my hardware (odroid u3+) and my
"other hardware" (dummy_hcd) but agree. This function is called from
set_alt() and this may be called in interrupt ctx so this should use
GFP_ATOMIC as you suggested.
Best regards,
--
Krzysztof Opasiak
Samsung R&D Institute Poland
Samsung Electronics
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