Messages in this thread | | | Date | Mon, 14 Nov 2011 17:54:52 +0800 | Subject | Re: [PATCH 1/1] driver core: disable device's runtime pm during shutdown | From | Ming Lei <> |
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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, :-)
> --- > 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, -- Ming Lei -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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