Messages in this thread Patch in this message | | | Date | Fri, 2 Apr 2004 14:28:38 -0800 | From | Todd Poynor <> | Subject | [PATCH] Device suspend/resume fixes |
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In case some changes to device handling during suspend/resume are welcome:
(1) Set device power state at runtime resume (as is done for runtime suspend) so that a later suspend does not think the device is still suspended.
(2) Move devices from active to off list only when suspending all devices, not for runtime suspend, to match resume handling, and to avoid reordering the device list (which is in order of registration and suspend/resume works best that way).
(3) Flush signals between resume handlers in case a resume function causes, for example, an ECHILD from modprobe or hotplug, so interruptible APIs for the next handler aren't affected.
--- linux-2.6.4-orig/drivers/base/power/suspend.c 2004-03-11 14:57:55.000000000 -0800 +++ linux-2.6.4-pm/drivers/base/power/suspend.c 2004-04-02 14:07:31.188415120 -0800 @@ -42,13 +42,6 @@ if (dev->bus && dev->bus->suspend) error = dev->bus->suspend(dev,state); - if (!error) { - list_del(&dev->power.entry); - list_add(&dev->power.entry,&dpm_off); - } else if (error == -EAGAIN) { - list_del(&dev->power.entry); - list_add(&dev->power.entry,&dpm_off_irq); - } return error; } @@ -81,12 +74,16 @@ while(!list_empty(&dpm_active)) { struct list_head * entry = dpm_active.prev; struct device * dev = to_device(entry); - if ((error = suspend_device(dev,state))) { - if (error != -EAGAIN) - goto Error; - else - error = 0; - } + error = suspend_device(dev,state); + + if (!error) { + list_del(&dev->power.entry); + list_add(&dev->power.entry,&dpm_off); + } else if (error == -EAGAIN) { + list_del(&dev->power.entry); + list_add(&dev->power.entry,&dpm_off_irq); + } else + goto Error; } Done: up(&dpm_sem); --- linux-2.6.4-orig/drivers/base/power/resume.c 2004-03-11 14:57:55.000000000 -0800 +++ linux-2.6.4-pm/drivers/base/power/resume.c 2004-04-02 14:07:29.425683096 -0800 @@ -37,6 +37,7 @@ list_del_init(entry); resume_device(dev); list_add_tail(entry,&dpm_active); + flush_signals(current); } } --- linux-2.6.4-orig/drivers/base/power/runtime.c 2004-03-11 15:02:22.000000000 -0800 +++ linux-2.6.4-pm/drivers/base/power/runtime.c 2004-04-02 14:23:31.400440704 -0800 @@ -12,9 +12,14 @@ static void runtime_resume(struct device * dev) { + int error; + if (!dev->power.power_state) return; - resume_device(dev); + if (!(error = resume_device(dev))) + dev->power.power_state = 0; + + return error; }
-- Todd Poynor MontaVista Software - 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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