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usb: chipidea: host: fix NULL ptr dereference during shutdown 

After commit b09b5224fe ("usb: chipidea: implement platform shutdown
callback") and commit 43a404577a ("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@rowland.harvard.edu>
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Fixes: b09b5224fe ("usb: chipidea: implement platform shutdown callback")
Signed-off-by: Peter Chen <peter.chen@nxp.com>
This commit is contained in:
Stefan Wahren 2016-09-10 12:53:21 +00:00 committed by Peter Chen
parent b76032396d
commit 991d5add50
1 changed files with 2 additions and 0 deletions
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2
drivers/usb/chipidea/host.c
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@ -188,6 +188,8 @@ 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))