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Commit 03e10e5a authored by Ben Dooks's avatar Ben Dooks Committed by Greg Kroah-Hartman
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USB: s3c-hsotg: Only load packet per fifo write 



Limit the IN FIFO write to a single packet per attempt at writing,
as per the specifications and ensure that we don't return fifo-full
so that we can continue writing packets if we have the space.

Signed-off-by: default avatarBen Dooks <ben-linux@fluff.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 10aebc77

drivers/usb/gadget/s3c-hsotg.c

+11 −0
Original line number Original line Diff line number Diff line
@@ -538,6 +538,17 @@ static int s3c_hsotg_write_fifo(struct s3c_hsotg *hsotg, 
	if (can_write > 512)

	if (can_write > 512)

		can_write = 512;

		can_write = 512;





	/* limit the write to one max-packet size worth of data, but allow

	 * the transfer to return that it did not run out of fifo space

	 * doing it. */

	if (to_write > hs_ep->ep.maxpacket) {

		to_write = hs_ep->ep.maxpacket;



		s3c_hsotg_en_gsint(hsotg,

				   periodic ? S3C_GINTSTS_PTxFEmp :

				   S3C_GINTSTS_NPTxFEmp);

	}



	/* see if we can write data */

	/* see if we can write data */





	if (to_write > can_write) {

	if (to_write > can_write) {