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@vger.kernel.org> # v3.10+
Signed-off-by: Li Jun <jun.li@freescale.com>
Signed-off-by: Peter Chen <peter.chen@freescale.com>

diff --git a/drivers/usb/chipidea/debug.c b/drivers/usb/chipidea/debug.c
index 080b7be3daf034939bd12c509353c041b6027f49..58c8485a0715ada6c585a29e23883f25091fa127 100644 (file)
--- 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;