From 781001ff9678e5df048cca3d4290c1638a28cafa Mon Sep 17 00:00:00 2001 From: Yoshihiro Shimoda Date: Tue, 18 Jul 2017 21:26:42 +0900 Subject: [PATCH] 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 Signed-off-by: Yoshihiro Shimoda Signed-off-by: Felipe Balbi --- drivers/usb/gadget/udc/renesas_usb3.c | 6 +++--- 1 file 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; -- 2.20.1