On Wed, 21 Jan 2015, Roger Tseng wrote:
> On Tue, 2015-01-20 at 16:07 +0000, Lee Jones wrote:
> > 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.
> >
> That's great, thanks! And thus patch 2/2 also needs to be changed
> accordingly.
>
> By the way, the build bot reported again about an undefined variable
> build error in 2/2(I'm sorry for this again). I put the overall updated
> content of 2/2 here for you if you're going to fix it, or I can also
> re-send it individually.
Please re-send this patch and prefix it with [OVERWRITE].
In future make sure you test your submission thoroughly prior to
sending, as my time is very limited and with all due respect I could
make better use of it than this.
> diff --git a/drivers/mfd/rtsx_usb.c b/drivers/mfd/rtsx_usb.c
> index 210d1f85679e..ede50244f265 100644
> --- a/drivers/mfd/rtsx_usb.c
> +++ b/drivers/mfd/rtsx_usb.c
> @@ -681,9 +681,27 @@ static void rtsx_usb_disconnect(struct
> usb_interface *intf)
> #ifdef CONFIG_PM
> static int rtsx_usb_suspend(struct usb_interface *intf, pm_message_t
> message)
> {
> + struct rtsx_ucr *ucr =
> + (struct rtsx_ucr *)usb_get_intfdata(intf);
> + u16 val = 0;
> +
> dev_dbg(&intf->dev, "%s called with pm message 0x%04x\n",
> __func__, message.event);
>
> + if (PMSG_IS_AUTO(message)) {
> + if (mutex_trylock(&ucr->dev_mutex)) {
> + rtsx_usb_get_card_status(ucr, &val);
> + mutex_unlock(&ucr->dev_mutex);
> +
> + /* Defer the autosuspend if card exists */
> + if (val & (SD_CD | MS_CD))
> + return -EAGAIN;
> + } else {
> + /* There is an ongoing operation*/
> + return -EAGAIN;
> + }
> + }
> +
> return 0;
> }
>
>
>
> > > > > 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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