Commit 26b053be authored May 02, 2018 by Ajay Agarwal

usb: ehci-hcd: Fix ehci shutdown unclocked register access



ehci shutdown callback can access registers with the clocks
turned off if the USB controller is in low power mode. Check
HCD_FLAG_HW_ACCESSIBLE flag before accessing any register.

Change-Id: Iafc9a5057aa196131b3aa7a2f659b9f8f052ec7f
Signed-off-by: Ajay Agarwal <ajaya@codeaurora.org>

parent c287f849

drivers/usb/host/ehci-hcd.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -377,6 +377,9 @@ static void ehci_shutdown(struct usb_hcd *hcd)
		if (!ehci->sbrn)
		return;

		if (!HCD_HW_ACCESSIBLE(hcd))
		return;

		spin_lock_irq(&ehci->lock);
		ehci->shutdown = true;
		ehci->rh_state = EHCI_RH_STOPPING;