usb: gadget: ffs: change gfp_flags to GFP_ATOMIC
usb_ep_alloc_request() may sleep with current flag
GFP_KERNEL, but it is in atomic context, change
flag to GFP_ATOMIC to fix this issue.
Change-Id: Ic43a25f0a504d7fed104e636a9a614a4398820ab
Signed-off-by:
Liangliang Lu <luliang@codeaurora.org>
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