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usb: gadget: composite: Correct recovery path for register

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In case when usb_composite_register() failed once (for whatever reason),
it will fail further even if all conditions are correct. Example:

    => fastboot 2
    Invalid Controller Index
    couldn't find an available UDC
    g_dnl_register: failed!, error: -19
    exit not allowed from main input shell.

    => fastboot 0
    g_dnl_register: failed!, error: -22
    exit not allowed from main input shell.

Despite that 0 is correct index for USB controller, "fastboot 0" command
will fail, because "composite" structure wasn't cleared properly on
previous fail (on "fastboot 2" command).

This patch fixes that erroneous behavior, allowing us to use composite
even after previous failure.

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
This commit is contained in:
Sam Protsenko 2016-02-16 19:59:19 +02:00 committed by Marek Vasut
parent 50dc8677d7
commit 8038f6d288
1 changed files with 7 additions and 1 deletions
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8
drivers/usb/gadget/composite.c
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@ -1077,6 +1077,8 @@ static struct usb_gadget_driver composite_driver = {
*/
int usb_composite_register(struct usb_composite_driver *driver)
{
int res;
if (!driver || !driver->dev || !driver->bind || composite)
return -EINVAL;
@ -1084,7 +1086,11 @@ int usb_composite_register(struct usb_composite_driver *driver)
driver->name = "composite";
composite = driver;
return usb_gadget_register_driver(&composite_driver);
res = usb_gadget_register_driver(&composite_driver);
if (res != 0)
composite = NULL;
return res;
}
/**