diff options
| author | Ajay Kumar Gupta <ajay.gupta@ti.com> | 2012-07-20 07:37:24 +0200 |
|---|---|---|
| committer | Felipe Balbi <balbi@ti.com> | 2012-08-03 08:34:41 +0200 |
| commit | 603fe2b21d9fcde2022f9b52d95027bea29fe9e3 (patch) | |
| tree | 7cd9398bb5f39ae84655344f8fa1c7beaea261ed /drivers | |
| parent | usb: musb: gadget: don't program dma for zero byte tx (diff) | |
| download | linux-603fe2b21d9fcde2022f9b52d95027bea29fe9e3.tar.xz linux-603fe2b21d9fcde2022f9b52d95027bea29fe9e3.zip | |
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')
| -rw-r--r-- | 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 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); |