| Message ID | 2852781.TfChGuuEkJ@vostro.rjw.lan |
|---|---|
| State | Not Applicable |
| Headers | show |
On Tue, Aug 20, 2013 at 01:47:57AM +0200, Rafael J. Wysocki wrote: > From: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > > Bad things happen if ACPI hotplug events are handled during system > PM transitions, especially if devices are removed as a result. > To prevent those bad things from happening, acquire acpi_scan_lock > when a transition is started and release it when that transition > is complete or has been aborted. > > This fixes resume lockup on my test-bed Acer Aspire S5 that happens > when Thunderbolt devices are disconnected from the machine while > suspended. > > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> I tested this on Intel DZ77RE-75K and after the patch is applied the machine didn't hang anymore once resuming. Feel free to add my tested-by. -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Tuesday, August 20, 2013 02:08:33 PM Mika Westerberg wrote: > On Tue, Aug 20, 2013 at 01:47:57AM +0200, Rafael J. Wysocki wrote: > > From: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > > > > Bad things happen if ACPI hotplug events are handled during system > > PM transitions, especially if devices are removed as a result. > > To prevent those bad things from happening, acquire acpi_scan_lock > > when a transition is started and release it when that transition > > is complete or has been aborted. > > > > This fixes resume lockup on my test-bed Acer Aspire S5 that happens > > when Thunderbolt devices are disconnected from the machine while > > suspended. > > > > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > > I tested this on Intel DZ77RE-75K and after the patch is applied the > machine didn't hang anymore once resuming. > > Feel free to add my tested-by. I will, thanks! -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Tue, 2013-08-20 at 01:47 +0200, Rafael J. Wysocki wrote: > From: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > > Bad things happen if ACPI hotplug events are handled during system > PM transitions, especially if devices are removed as a result. > To prevent those bad things from happening, acquire acpi_scan_lock > when a transition is started and release it when that transition > is complete or has been aborted. > > This fixes resume lockup on my test-bed Acer Aspire S5 that happens > when Thunderbolt devices are disconnected from the machine while > suspended. > > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> The change looks good to me. Acked-by: Toshi Kani <toshi.kani@hp.com> Thanks, -Toshi -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Index: linux-pm/drivers/acpi/sleep.c =================================================================== --- linux-pm.orig/drivers/acpi/sleep.c +++ linux-pm/drivers/acpi/sleep.c @@ -420,10 +420,21 @@ static void acpi_pm_finish(void) } /** - * acpi_pm_end - Finish up suspend sequence. + * acpi_pm_start - Start system PM transition. + */ +static void acpi_pm_start(u32 acpi_state) +{ + acpi_target_sleep_state = acpi_state; + acpi_sleep_tts_switch(acpi_target_sleep_state); + acpi_scan_lock_acquire(); +} + +/** + * acpi_pm_end - Finish up system PM transition. */ static void acpi_pm_end(void) { + acpi_scan_lock_release(); /* * This is necessary in case acpi_pm_finish() is not called during a * failing transition to a sleep state. @@ -451,21 +462,19 @@ static u32 acpi_suspend_states[] = { static int acpi_suspend_begin(suspend_state_t pm_state) { u32 acpi_state = acpi_suspend_states[pm_state]; - int error = 0; + int error; error = (nvs_nosave || nvs_nosave_s3) ? 0 : suspend_nvs_alloc(); if (error) return error; - if (sleep_states[acpi_state]) { - acpi_target_sleep_state = acpi_state; - acpi_sleep_tts_switch(acpi_target_sleep_state); - } else { - printk(KERN_ERR "ACPI does not support this state: %d\n", - pm_state); - error = -ENOSYS; + if (!sleep_states[acpi_state]) { + pr_err("ACPI does not support sleep state S%u\n", acpi_state); + return -ENOSYS; } - return error; + + acpi_pm_start(acpi_state); + return 0; } /** @@ -631,10 +640,8 @@ static int acpi_hibernation_begin(void) int error; error = nvs_nosave ? 0 : suspend_nvs_alloc(); - if (!error) { - acpi_target_sleep_state = ACPI_STATE_S4; - acpi_sleep_tts_switch(acpi_target_sleep_state); - } + if (!error) + acpi_pm_start(ACPI_STATE_S4); return error; } @@ -713,8 +720,10 @@ static int acpi_hibernation_begin_old(vo if (!error) { if (!nvs_nosave) error = suspend_nvs_alloc(); - if (!error) + if (!error) { acpi_target_sleep_state = ACPI_STATE_S4; + acpi_scan_lock_acquire(); + } } return error; }