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SubjectRe: [PATCH 1/1] driver core: disable device's runtime pm during shutdown
Date
On Monday, November 14, 2011, Ming Lei wrote:
> Hi,
>
> On Mon, Nov 14, 2011 at 8:43 AM, Peter Chen <peter.chen@freescale.com> wrote:
> > There may be an issue when the user issue "reboot/shutdown" command, then
> > the device has shut down its hardware, after that, this runtime-pm featured
> > device's driver will probably be scheduled to do its suspend routine,
> > and at its suspend routine, it may access hardware, but the device has
> > already shutdown physically, then the system hang may be occurred.
> >
> > I ran out this issue using an auto-suspend supported USB devices, like
> > 3G modem, keyboard. The usb runtime suspend routine may be scheduled
> > after the usb controller has been shut down, and the usb runtime suspend
> > routine will try to suspend its roothub(controller), it will access
> > register, then the system hang occurs as the controller is shutdown.
> > Signed-off-by: Peter Chen <peter.chen@freescale.com>
>
> This patch should make many guys happy about shutdown/reboot function,
> at least fix the reboot issue on my panda board, maybe CC stable@kernel.org
> is needed, :-)

I'm taking this as an ACK.

Rafael


> > ---
> > drivers/base/core.c | 3 +++
> > 1 files changed, 3 insertions(+), 0 deletions(-)
> >
> > diff --git a/drivers/base/core.c b/drivers/base/core.c
> > index bc8729d..78445f4 100644
> > --- a/drivers/base/core.c
> > +++ b/drivers/base/core.c
> > @@ -22,6 +22,7 @@
> > #include <linux/kallsyms.h>
> > #include <linux/mutex.h>
> > #include <linux/async.h>
> > +#include <linux/pm_runtime.h>
> >
> > #include "base.h"
> > #include "power/power.h"
> > @@ -1742,6 +1743,8 @@ void device_shutdown(void)
> > */
> > list_del_init(&dev->kobj.entry);
> > spin_unlock(&devices_kset->list_lock);
> > + /* Disable all device's runtime power management */
> > + pm_runtime_disable(dev);
> >
> > if (dev->bus && dev->bus->shutdown) {
> > dev_dbg(dev, "shutdown\n");
> > --
> > 1.7.1
> >
> >
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-pm" in
> > the body of a message to majordomo@vger.kernel.org
> > More majordomo info at http://vger.kernel.org/majordomo-info.html
> >
>
> thanks,
>



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