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

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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>
This commit is contained in:
Ajay Kumar Gupta 2012-07-20 11:07:24 +05:30 committed by Felipe Balbi
parent d17d535fec
commit 603fe2b21d
1 changed files with 6 additions and 0 deletions
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6
drivers/usb/musb/musb_core.c
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@ -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);