On Tue, 20 Jan 2015, Roger Tseng wrote:
> On Mon, 2015-01-19 at 09:45 +0000, Lee Jones wrote:
> > On Thu, 15 Jan 2015, Roger Tseng wrote:
> >
> > > sd_set_power_mode() in derived module drivers/mmc/host/rtsx_usb_sdmmc.c
> > > acquires dev_mutex and then calls pm_runtime_get_sync() to make sure the
> > > device is awake while initializing a newly inserted card. Once it is
> > > called during suspending state and explicitly before rtsx_usb_suspend()
> > > acquires the same dev_mutex, both routine deadlock and further hang the
> > > driver because pm_runtime_get_sync() waits the pending PM operations.
> > >
> > > Fix this by using an empty suspend method. mmc_core always turns the
> > > LED off after a request is done and thus it is ok to remove the only
> > > rtsx_usb_turn_off_led() here.
> > >
> > > Cc: <stable@xxxxxxxxxxxxxxx> # v3.16+
> > > Fixes: 730876be2566 ("mfd: Add realtek USB card reader driver")
> > > Signed-off-by: Roger Tseng <rogerable@xxxxxxxxxxx>
> > > ---
> > > drivers/mfd/rtsx_usb.c | 9 ---------
> > > 1 file changed, 9 deletions(-)
> >
> > Applied, thanks.
> >
> I'm sorry but build bot from Intel just reported me that I forgot to
> delete an unused variable "ucr" between two commits. My bad.
>
> Do I have a chance to send v2?
You're lucky I'm in a good mood. ;)
I fixed it already.
> > > diff --git a/drivers/mfd/rtsx_usb.c b/drivers/mfd/rtsx_usb.c
> > > index dbdd0faeb6ce..076694126e5d 100644
> > > --- a/drivers/mfd/rtsx_usb.c
> > > +++ b/drivers/mfd/rtsx_usb.c
> > > @@ -687,15 +687,6 @@ static int rtsx_usb_suspend(struct usb_interface *intf, pm_message_t message)
> > > dev_dbg(&intf->dev, "%s called with pm message 0x%04x\n",
> > > __func__, message.event);
> > >
> > > - /*
> > > - * Call to make sure LED is off during suspend to save more power.
> > > - * It is NOT a permanent state and could be turned on anytime later.
> > > - * Thus no need to call turn_on when resunming.
> > > - */
> > > - mutex_lock(&ucr->dev_mutex);
> > > - rtsx_usb_turn_off_led(ucr);
> > > - mutex_unlock(&ucr->dev_mutex);
> > > -
> > > return 0;
> > > }
> > >
> >
>
--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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