diff options
Diffstat (limited to 'drivers/usb/chipidea/udc.c')
| -rw-r--r-- | drivers/usb/chipidea/udc.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c index d93e43cfb6f8..ebcf40c2f12b 100644 --- a/drivers/usb/chipidea/udc.c +++ b/drivers/usb/chipidea/udc.c @@ -939,6 +939,15 @@ 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; |