linux-kernel - [PATCH] USB: gadget: s3c-hsotg: fix can_write limit for non-periodic endpoints

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Date:	Tue, 24 Sep 2013 11:24:28 +0200
From:	Robert Baldyga <r.baldyga@...sung.com>
To:	balbi@...com
Cc:	gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, b.zolnierkie@...sung.com,
	m.szyprowski@...sung.com, andrzej.p@...sung.com,
	Robert Baldyga <r.baldyga@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>
Subject: [PATCH] USB: gadget: s3c-hsotg: fix can_write limit for non-periodic
 endpoints

Value of can_write variable in s3c_hsotg_write_fifo function should be limited
to 512 only for non-periodic endpoints. There was some discrepancy between
comment and code, becouse comment suggests correct behavior, but in the code
limit was applied to periodic endpoints too. So there is additional check
causing the limitation concerns only non-periodic endpoints.

Signed-off-by: Robert Baldyga <r.baldyga@...sung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@...sung.com>
---
 drivers/usb/gadget/s3c-hsotg.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

I have found one small bug in s3c_hsotg_write_fifo function which doesn't
allow to perform transfers greater than 512 bytes. 

diff --git a/drivers/usb/gadget/s3c-hsotg.c b/drivers/usb/gadget/s3c-hsotg.c
index d5d951d..2b9c446 100644
--- a/drivers/usb/gadget/s3c-hsotg.c
+++ b/drivers/usb/gadget/s3c-hsotg.c
@@ -542,7 +542,7 @@ static int s3c_hsotg_write_fifo(struct s3c_hsotg *hsotg,
 	 * FIFO, requests of >512 cause the endpoint to get stuck with a
 	 * fragment of the end of the transfer in it.
 	 */
-	if (can_write > 512)
+	if (can_write > 512 && !periodic)
 		can_write = 512;
 
 	/*
-- 
1.7.9.5

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