On Fri, Feb 19, 2016 at 9:34 PM, Sam Protsenko <semen.protse...@linaro.org> wrote: > + Praneeth Bajjuri > + Tom Rini > + Rob Herring > > On Tue, Feb 16, 2016 at 7:59 PM, Semen Protsenko > <semen.protse...@linaro.org> wrote: >> From: Sam Protsenko <semen.protse...@linaro.org> >> >> 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.protse...@linaro.org> >> --- >> drivers/usb/gadget/composite.c | 8 +++++++- >> 1 file changed, 7 insertions(+), 1 deletion(-) >> >> diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c >> index 60f9272..d0ee784 100644 >> --- a/drivers/usb/gadget/composite.c >> +++ b/drivers/usb/gadget/composite.c >> @@ -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; >> } >> >> /** >> -- >> 2.7.0 >>
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