4.8-stable review patch. If anyone has any objections, please let me know.
------------------
From: Stefan Wahren <stefan.wahren@xxxxxxxx>
commit 991d5add50a5bb6ab8f12f2129f5c7487f6baaf6 upstream.
After commit b09b5224fe86 ("usb: chipidea: implement platform shutdown
callback") and commit 43a404577a93 ("usb: chipidea: host: set host to
be null after hcd is freed") a NULL pointer dereference is caused
on i.MX23 during shutdown. So ensure that role is set to CI_ROLE_END and
we finish interrupt handling before the hcd is deallocated. This avoids
the NULL pointer dereference.
Suggested-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Stefan Wahren <stefan.wahren@xxxxxxxx>
Fixes: b09b5224fe86 ("usb: chipidea: implement platform shutdown callback")
Signed-off-by: Peter Chen <peter.chen@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/chipidea/host.c | 2 ++
1 file changed, 2 insertions(+)
--- a/drivers/usb/chipidea/host.c
+++ b/drivers/usb/chipidea/host.c
@@ -185,6 +185,8 @@ static void host_stop(struct ci_hdrc *ci
if (hcd) {
usb_remove_hcd(hcd);
+ ci->role = CI_ROLE_END;
+ synchronize_irq(ci->irq);
usb_put_hcd(hcd);
if (ci->platdata->reg_vbus && !ci_otg_is_fsm_mode(ci) &&
(ci->platdata->flags & CI_HDRC_TURN_VBUS_EARLY_ON))
--
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