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| author | John Stultz <john.stultz@linaro.org> | 2011-07-20 17:09:34 -0700 |
|---|---|---|
| committer | Felipe Balbi <balbi@ti.com> | 2011-08-12 11:52:42 +0300 |
| commit | 93e098a8fc02c579875e64001f7a511b7e75a16c (patch) | |
| tree | c713fdba9768c87a6d253d838235dab11c0a30de | |
| parent | 15154962f777e4ab38adb7641ccae92194c9a96b (diff) | |
| download | linux-stable-93e098a8fc02c579875e64001f7a511b7e75a16c.tar.gz linux-stable-93e098a8fc02c579875e64001f7a511b7e75a16c.tar.bz2 linux-stable-93e098a8fc02c579875e64001f7a511b7e75a16c.zip | |
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>
| -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; } |