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usb: misc: usbtest: fix error of urb allocation

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urb allocation will fail when usbtest_alloc_urb() tries to
allocate zero length buffer, but it doesn't need it in fact,
so just skips buffer allocation in the case.

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Chunfeng Yun 2016-04-28 11:42:21 +08:00 committed by Greg Kroah-Hartman
parent f5e6253fe6
commit 26186e5f2c
1 changed files with 3 additions and 0 deletions
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3
drivers/usb/misc/usbtest.c
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@ -287,6 +287,9 @@ static struct urb *usbtest_alloc_urb(
if (usb_pipein(pipe))
urb->transfer_flags |= URB_SHORT_NOT_OK;
if ((bytes + offset) == 0)
return urb;
if (urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP)
urb->transfer_buffer = usb_alloc_coherent(udev, bytes + offset,
GFP_KERNEL, &urb->transfer_dma);