diff options
| author | Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> | 2017-07-18 21:26:42 +0900 |
|---|---|---|
| committer | Felipe Balbi <felipe.balbi@linux.intel.com> | 2017-07-18 16:20:31 +0300 |
| commit | 781001ff9678e5df048cca3d4290c1638a28cafa (patch) | |
| tree | 1b86a7b0e8e378faf5d3fdc17fc1caa356a825dd | |
| parent | ebe6b2b81464a2c083542feb1a1a6c78a2268151 (diff) | |
| download | linux-781001ff9678e5df048cca3d4290c1638a28cafa.tar.bz2 | |
usb: gadget: udc: renesas_usb3: protect usb3_ep->started in usb3_start_pipen()
This patch fixes an issue that unexpected behavior happens when
both the interrupt handler and renesas_usb3_ep_enable() are called.
In this case, since usb3_start_pipen() checked the usb3_ep->started,
but the flags was not protected. So, this patch protects the flag
by usb3->lock. Since renesas_usb3_ep_enable() for EP0 will be not called,
this patch doesn't take care of usb3_start_pipe0().
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
| -rw-r--r-- | drivers/usb/gadget/udc/renesas_usb3.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/usb/gadget/udc/renesas_usb3.c b/drivers/usb/gadget/udc/renesas_usb3.c index 1cc5f0deefba..62dc9c7798e7 100644 --- a/drivers/usb/gadget/udc/renesas_usb3.c +++ b/drivers/usb/gadget/udc/renesas_usb3.c @@ -1415,12 +1415,12 @@ static void usb3_start_pipen(struct renesas_usb3_ep *usb3_ep, int ret = -EAGAIN; u32 enable_bits = 0; + spin_lock_irqsave(&usb3->lock, flags); if (usb3_ep->halt || usb3_ep->started) - return; + goto out; if (usb3_req != usb3_req_first) - return; + goto out; - spin_lock_irqsave(&usb3->lock, flags); if (usb3_pn_change(usb3, usb3_ep->num) < 0) goto out; |