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usb: gadget: udc: atmel: Fix vbus disconnect handling 

A DMA transfer can be in progress while vbus is lost due to a cable
disconnect. For endpoints that use DMA, this condition can lead to
peripheral hang. The patch ensures that endpoints are disabled before
the clocks are stopped to prevent this issue.

Fixes: a64ef71ddc ("usb: gadget: atmel_usba_udc: condition clocks to vbus state")
Signed-off-by: Cristian Birsan <cristian.birsan@microchip.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
This commit is contained in:
Cristian Birsan 2020-04-10 15:14:52 +03:00 committed by Felipe Balbi
parent 49e0590e3a
commit 12b94da411
1 changed files with 2 additions and 2 deletions
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4
drivers/usb/gadget/udc/atmel_usba_udc.c
View File

@ -1951,10 +1951,10 @@ static irqreturn_t usba_vbus_irq_thread(int irq, void *devid)
usba_start(udc);
} else {
udc->suspended = false;
usba_stop(udc);
if (udc->driver->disconnect)
udc->driver->disconnect(&udc->gadget);
usba_stop(udc);
}
udc->vbus_prev = vbus;
}