diff options
| author | John Stultz <john.stultz@linaro.org> | 2011-07-21 04:09:34 +0400 |
|---|---|---|
| committer | Felipe Balbi <balbi@ti.com> | 2011-08-01 23:06:50 +0400 |
| commit | 72c487dfb94d02025fb7437dfe2314d836d5a9ab (patch) | |
| tree | 047bb96aa1eb097f8ad14b15608efac18c3b2232 /drivers/usb/musb | |
| parent | d4aefec5daf51ebda90ebf0989598c206cf8e640 (diff) | |
| download | linux-72c487dfb94d02025fb7437dfe2314d836d5a9ab.tar.xz | |
usb: musb: fix oops on musb_gadget_pullup
an 'unhandled fault' is causes when a gadget driver calls
usb_gadget_connect() while the USB cable isn't plugged into
the OTG port.
the fault is caused by an access to MUSB's memory space
while its clock is turned off due to pm_runtime kicking
in.
in order to fix the fault, we enclose musb_gadget_pullup()
with pm_runtime_get_sync() ... pm_runtime_put() calls to
be sure we will always reach that path with clock turned on.
[ balbi@ti.com : simplified commit log; removed few things
which didn't belong there ]
Cc: stable@kernel.org
Reported-by: Zach Pfeffer <zach.pfeffer@linaro.org>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Diffstat (limited to 'drivers/usb/musb')
| -rw-r--r-- | drivers/usb/musb/musb_gadget.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c index b67a062f556b..8c41a2e6ea77 100644 --- a/drivers/usb/musb/musb_gadget.c +++ b/drivers/usb/musb/musb_gadget.c @@ -1698,6 +1698,8 @@ static int musb_gadget_pullup(struct usb_gadget *gadget, int is_on) is_on = !!is_on; + pm_runtime_get_sync(musb->controller); + /* NOTE: this assumes we are sensing vbus; we'd rather * not pullup unless the B-session is active. */ @@ -1707,6 +1709,9 @@ static int musb_gadget_pullup(struct usb_gadget *gadget, int is_on) musb_pullup(musb, is_on); } spin_unlock_irqrestore(&musb->lock, flags); + + pm_runtime_put(musb->controller); + return 0; } |