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Fix the possible kernel panic when the hardware signal is bad for chipidea udc.

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Merge tag 'usb-ci-v4.8-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/peter.chen/usb into usb-linus

Peter writes:

Fix the possible kernel panic when the hardware signal is bad for chipidea udc.
This commit is contained in:
Greg Kroah-Hartman 2016-09-09 13:47:20 +02:00
parent bcf42aa60c 6f3c4fb6d0
commit 1b49dae1ca
1 changed files with 9 additions and 0 deletions
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9
drivers/usb/chipidea/udc.c
View file

@ -949,6 +949,15 @@ static int isr_setup_status_phase(struct ci_hdrc *ci)
int retval;
struct ci_hw_ep *hwep;
/*
* Unexpected USB controller behavior, caused by bad signal integrity
* or ground reference problems, can lead to isr_setup_status_phase
* being called with ci->status equal to NULL.
* If this situation occurs, you should review your USB hardware design.
*/
if (WARN_ON_ONCE(!ci->status))
return -EPIPE;
hwep = (ci->ep0_dir == TX) ? ci->ep0out : ci->ep0in;
ci->status->context = ci;
ci->status->complete = isr_setup_status_complete;