The patch below does not apply to the 3.10-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable@xxxxxxxxxxxxxxx>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 251b3c8b57481bcecd3f753108e36e7389ce12ac Mon Sep 17 00:00:00 2001 From: Li Jun <jun.li@xxxxxxxxxxxxx> Date: Tue, 13 Oct 2015 18:23:31 +0800 Subject: [PATCH] usb: chipidea: debug: disable usb irq while role switch Since the ci->role will be set after the host role start is complete, there will be nobody cared irq during start host if usb irq enabled. This error can be reproduced on i.mx6 sololite EVK board by: 1. disable otg id irq(IDIE) and disable all real otg properties of usbotg1 in dts. 2. boot up the board with ID cable and usb device connected. 3. echo gadget > /sys/kernel/debug/ci_hdrc.0/role 4. echo host > /sys/kernel/debug/ci_hdrc.0/role 5. irq 212: nobody cared. Cc: <stable@xxxxxxxxxxxxxxx> # v3.10+ Signed-off-by: Li Jun <jun.li@xxxxxxxxxxxxx> Signed-off-by: Peter Chen <peter.chen@xxxxxxxxxxxxx> diff --git a/drivers/usb/chipidea/debug.c b/drivers/usb/chipidea/debug.c index 080b7be3daf0..58c8485a0715 100644 --- a/drivers/usb/chipidea/debug.c +++ b/drivers/usb/chipidea/debug.c @@ -322,8 +322,10 @@ static ssize_t ci_role_write(struct file *file, const char __user *ubuf, return -EINVAL; pm_runtime_get_sync(ci->dev); + disable_irq(ci->irq); ci_role_stop(ci); ret = ci_role_start(ci, role); + enable_irq(ci->irq); pm_runtime_put_sync(ci->dev); return ret ? ret : count; -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html