Added a check in musb_{read | write}_fifo for zero byte length.
Signed-off-by: Ajay Kumar Gupta <[email protected]>
---
drivers/usb/musb/musb_core.c | 6 ++++++
1 files changed, 6 insertions(+), 0 deletions(-)
diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index db3dff8..2901f38 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);
--
1.7.0.4
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