From: Ajay Kumar Gupta <ajay.gupta@ti.com>
Date: Fri, 20 Jul 2012 05:37:24 +0000 (+0530)
Subject: usb: musb: check for zero byte in musb_read/write_fifo
X-Git-Tag: v3.7-rc1~171^2~138^2~23
X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=603fe2b21d9fcde2022f9b52d95027bea29fe9e3;p=~emulex%2Finfiniband.git

usb: musb: check for zero byte in musb_read/write_fifo

Added a check in musb_{read | write}_fifo for zero byte length.

Signed-off-by: Ajay Kumar Gupta <ajay.gupta@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
---

diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index 26f1befb489..69711e43ac6 100644
--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c
@@ -234,6 +234,9 @@ void musb_write_fifo(struct musb_hw_ep *hw_ep, u16 len, const u8 *src)
 	struct musb *musb = hw_ep->musb;
 	void __iomem *fifo = hw_ep->fifo;
 
+	if (unlikely(len == 0))
+		return;
+
 	prefetch((u8 *)src);
 
 	dev_dbg(musb->controller, "%cX ep%d fifo %p count %d buf %p\n",
@@ -276,6 +279,9 @@ void musb_read_fifo(struct musb_hw_ep *hw_ep, u16 len, u8 *dst)
 	struct musb *musb = hw_ep->musb;
 	void __iomem *fifo = hw_ep->fifo;
 
+	if (unlikely(len == 0))
+		return;
+
 	dev_dbg(musb->controller, "%cX ep%d fifo %p count %d buf %p\n",
 			'R', hw_ep->epnum, fifo, len, dst);