[PATCH] usb: gadget: function: Replace GFP_KERNEL with GFP_ATOMIC

[Tapasweni Pathak <tapaswenipathak@gmail.com>]

To avoid deadlock, do not call blocking functions with spinlocks held.

Replace GFP_KERNEL with GFP_ATOMIC, as the latter will fail if the heap
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@gmail.com>
---
Is there any other way this can be fixed as it is better to avoid GFP_ATOMIC?

 drivers/usb/gadget/function/f_fs.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c
index af98b09..8a25d30 100644
--- a/drivers/usb/gadget/function/f_fs.c
+++ b/drivers/usb/gadget/function/f_fs.c
@@ -823,7 +823,7 @@ static ssize_t ffs_epfile_io(struct file *file, struct ffs_io_data *io_data)
 		}

 		if (io_data->aio) {
-			req = usb_ep_alloc_request(ep->ep, GFP_KERNEL);
+			req = usb_ep_alloc_request(ep->ep, GFP_ATOMIC);
 			if (unlikely(!req))
 				goto error_lock;

--
1.7.9.5