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authorAjay Kumar Gupta <ajay.gupta@ti.com>2012-07-20 11:07:24 +0530
committerFelipe Balbi <balbi@ti.com>2012-08-03 09:34:41 +0300
commit603fe2b21d9fcde2022f9b52d95027bea29fe9e3 (patch)
tree7cd9398bb5f39ae84655344f8fa1c7beaea261ed /drivers/usb/musb/musb_core.c
parentd17d535fec07dbd298b3f65838ec8d63c26ab360 (diff)
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>
Diffstat (limited to 'drivers/usb/musb/musb_core.c')
-rw-r--r--drivers/usb/musb/musb_core.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index 26f1befb4896..69711e43ac6b 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);

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