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path: root/drivers/usb/host/ehci-hcd.c
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Diffstat (limited to 'drivers/usb/host/ehci-hcd.c')
-rw-r--r--drivers/usb/host/ehci-hcd.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index ae1b6e69e..a962b89b6 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -368,6 +368,15 @@ static void ehci_shutdown(struct usb_hcd *hcd)
{
struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+ /**
+ * Protect the system from crashing at system shutdown in cases where
+ * usb host is not added yet from OTG controller driver.
+ * As ehci_setup() not done yet, so stop accessing registers or
+ * variables initialized in ehci_setup()
+ */
+ if (!ehci->sbrn)
+ return;
+
spin_lock_irq(&ehci->lock);
ehci->shutdown = true;
ehci->rh_state = EHCI_RH_STOPPING;