usb: gadget: android: Reset next_string_id before enable

Reset next_string_id to 0 before enabling the gadget driver. Otherwise,
after a large number of enable/disable cycles, bind will fail
because we cannot allocate new string ids. String ids cannot be larger
than 254 per USB spec.

Change-Id: I44f5fece45008b7a0a18c025d4eb5ce842585c28
Signed-off-by: Benoit Goby <benoit@android.com>

diff --git a/drivers/usb/gadget/android.c b/drivers/usb/gadget/android.c
index d109bfb..5d77899 100644 (file)
--- a/drivers/usb/gadget/android.c
+++ b/drivers/usb/gadget/android.c
@@ -823,6 +823,7 @@ static ssize_t enable_store(struct device *pdev, struct device_attribute *attr,
 
        sscanf(buff, "%d", &enabled);
        if (enabled && !dev->enabled) {
+               cdev->next_string_id = 0;
                /* update values in composite driver's copy of device descriptor */
                cdev->desc.idVendor = device_desc.idVendor;
                cdev->desc.idProduct = device_desc.idProduct;