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| author | Dmitry Shmidt <dimitrysh@google.com> | 2016-09-26 10:37:43 -0700 |
|---|---|---|
| committer | Dmitry Shmidt <dimitrysh@google.com> | 2016-09-26 10:37:43 -0700 |
| commit | 734bcf32c23442e81891641ae05e08108a4010d5 (patch) | |
| tree | b41cc318506b0c38ddf404520ba67753f3ab5452 /drivers/usb/chipidea/udc.c | |
| parent | 551569f25ec07596e144ffbc7911dd631645e63b (diff) | |
| parent | 8d5e93bb8c9c48ee5948f6b1aff0e895381f09e6 (diff) | |
Merge tag 'v4.4.22' into android-4.4.y
This is the 4.4.22 stable release
Change-Id: Id49e3c87d2cacb2fa85d85a17226f718f4a5ac28
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 ca367b05e440..68fc5fce4cc5 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; |