[PATCH] eeepc-laptop: fix hot-unplug on resume

[PATCH] eeepc-laptop: fix hot-unplug on resume

[Alan Jenkins]

The patch below fixes a regression introduced by the rfkill rewrite. 
Please consider it for inclusion in 2.6.31 via the ACPI tree.

Thanks
Alan

-------------------->

>From d0265f0bfe63086816d61c69ee4b2dc4cb491d06 Mon Sep 17 00:00:00 2001
From: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
Date: Mon, 29 Jun 2009 09:40:07 +0100
Subject: [PATCH] eeepc-laptop: fix hot-unplug on resume

OOPS on resume when the wireless adaptor is disabled during suspend was
introduced by "eeepc-laptop: read rfkill soft-blocked state on resume".

Unable to handle kernel NULL pointer dereference

Process s2disk
Tainted: G W
IP: klist_put

Call trace:
? klist_del
? device_del
? device_unregister
? pci_stop_dev
? pci_stop_bus
? pci_remove_device
? eeepc_rfkill_hotplug [eeepc_laptop]
? eeepc_hotk_resume [eeepc_laptop]
? acpi_device_resume
? device_resume
? hibernation_snapshot

It appears the PCI device is removed twice.  The eeepc_rfkill_hotplug()
call from the resume handler is racing against the call from the ACPI
notifier callback.  The ACPI notification is triggered by the resume
handler when it refreshes the value of CM_ASL_WLAN.

The fix is to serialize hotplug calls using a workqueue.

Signed-off-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
---
 drivers/platform/x86/eeepc-laptop.c |    9 ++++++---
 1 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/platform/x86/eeepc-laptop.c b/drivers/platform/x86/eeepc-laptop.c
index ec560f1..222ffb8 100644
--- a/drivers/platform/x86/eeepc-laptop.c
+++ b/drivers/platform/x86/eeepc-laptop.c
@@ -143,6 +143,7 @@ struct eeepc_hotk {
 	struct rfkill *bluetooth_rfkill;
 	struct rfkill *wwan3g_rfkill;
 	struct hotplug_slot *hotplug_slot;
+	struct work_struct hotplug_work;
 };
 
 /* The actual device the driver binds to */
@@ -660,7 +661,7 @@ static int eeepc_get_adapter_status(struct hotplug_slot *hotplug_slot,
 	return 0;
 }
 
-static void eeepc_rfkill_hotplug(void)
+static void eeepc_hotplug_work(struct work_struct *work)
 {
 	struct pci_dev *dev;
 	struct pci_bus *bus = pci_find_bus(0, 1);
@@ -701,7 +702,7 @@ static void eeepc_rfkill_notify(acpi_handle handle, u32 event, void *data)
 	if (event != ACPI_NOTIFY_BUS_CHECK)
 		return;
 
-	eeepc_rfkill_hotplug();
+	schedule_work(&ehotk->hotplug_work);
 }
 
 static void eeepc_hotk_notify(struct acpi_device *device, u32 event)
@@ -892,7 +893,7 @@ static int eeepc_hotk_resume(struct acpi_device *device)
 
 		rfkill_set_sw_state(ehotk->wlan_rfkill, wlan != 1);
 
-		eeepc_rfkill_hotplug();
+		schedule_work(&ehotk->hotplug_work);
 	}
 
 	if (ehotk->bluetooth_rfkill)
@@ -1093,6 +1094,8 @@ static int eeepc_rfkill_init(struct device *dev)
 {
 	int result = 0;
 
+	INIT_WORK(&ehotk->hotplug_work, eeepc_hotplug_work);
+
 	eeepc_register_rfkill_notifier("\\_SB.PCI0.P0P6");
 	eeepc_register_rfkill_notifier("\\_SB.PCI0.P0P7");
 
-- 
1.6.3.2

Re: [PATCH] eeepc-laptop: fix hot-unplug on resume

[Corentin Chary]

On Mon, Jun 29, 2009 at 1:12 PM, Alan
Jenkins<alan-jenkins@tuffmail.co.uk> wrote:
> The patch below fixes a regression introduced by the rfkill rewrite.
> Please consider it for inclusion in 2.6.31 via the ACPI tree.
>
> Thanks
> Alan

Hi Len,

Please merge this patch in ACPI tree.
Thanks,

-- 
Corentin Chary
http://xf.iksaif.net - http://uffs.org

Re: [PATCH] eeepc-laptop: fix hot-unplug on resume

[Rafael J. Wysocki]

On Monday 29 June 2009, Alan Jenkins wrote:
> The patch below fixes a regression introduced by the rfkill rewrite. 
> Please consider it for inclusion in 2.6.31 via the ACPI tree.

Is there a Bugzilla # for this regression?

Rafael

> -------------------->
> 
> From d0265f0bfe63086816d61c69ee4b2dc4cb491d06 Mon Sep 17 00:00:00 2001
> From: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
> Date: Mon, 29 Jun 2009 09:40:07 +0100
> Subject: [PATCH] eeepc-laptop: fix hot-unplug on resume
> 
> OOPS on resume when the wireless adaptor is disabled during suspend was
> introduced by "eeepc-laptop: read rfkill soft-blocked state on resume".
> 
> Unable to handle kernel NULL pointer dereference
> 
> Process s2disk
> Tainted: G W
> IP: klist_put
> 
> Call trace:
> ? klist_del
> ? device_del
> ? device_unregister
> ? pci_stop_dev
> ? pci_stop_bus
> ? pci_remove_device
> ? eeepc_rfkill_hotplug [eeepc_laptop]
> ? eeepc_hotk_resume [eeepc_laptop]
> ? acpi_device_resume
> ? device_resume
> ? hibernation_snapshot
> 
> It appears the PCI device is removed twice.  The eeepc_rfkill_hotplug()
> call from the resume handler is racing against the call from the ACPI
> notifier callback.  The ACPI notification is triggered by the resume
> handler when it refreshes the value of CM_ASL_WLAN.
> 
> The fix is to serialize hotplug calls using a workqueue.
> 
> Signed-off-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
> ---
>  drivers/platform/x86/eeepc-laptop.c |    9 ++++++---
>  1 files changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/platform/x86/eeepc-laptop.c b/drivers/platform/x86/eeepc-laptop.c
> index ec560f1..222ffb8 100644
> --- a/drivers/platform/x86/eeepc-laptop.c
> +++ b/drivers/platform/x86/eeepc-laptop.c
> @@ -143,6 +143,7 @@ struct eeepc_hotk {
>  	struct rfkill *bluetooth_rfkill;
>  	struct rfkill *wwan3g_rfkill;
>  	struct hotplug_slot *hotplug_slot;
> +	struct work_struct hotplug_work;
>  };
>  
>  /* The actual device the driver binds to */
> @@ -660,7 +661,7 @@ static int eeepc_get_adapter_status(struct hotplug_slot *hotplug_slot,
>  	return 0;
>  }
>  
> -static void eeepc_rfkill_hotplug(void)
> +static void eeepc_hotplug_work(struct work_struct *work)
>  {
>  	struct pci_dev *dev;
>  	struct pci_bus *bus = pci_find_bus(0, 1);
> @@ -701,7 +702,7 @@ static void eeepc_rfkill_notify(acpi_handle handle, u32 event, void *data)
>  	if (event != ACPI_NOTIFY_BUS_CHECK)
>  		return;
>  
> -	eeepc_rfkill_hotplug();
> +	schedule_work(&ehotk->hotplug_work);
>  }
>  
>  static void eeepc_hotk_notify(struct acpi_device *device, u32 event)
> @@ -892,7 +893,7 @@ static int eeepc_hotk_resume(struct acpi_device *device)
>  
>  		rfkill_set_sw_state(ehotk->wlan_rfkill, wlan != 1);
>  
> -		eeepc_rfkill_hotplug();
> +		schedule_work(&ehotk->hotplug_work);
>  	}
>  
>  	if (ehotk->bluetooth_rfkill)
> @@ -1093,6 +1094,8 @@ static int eeepc_rfkill_init(struct device *dev)
>  {
>  	int result = 0;
>  
> +	INIT_WORK(&ehotk->hotplug_work, eeepc_hotplug_work);
> +
>  	eeepc_register_rfkill_notifier("\\_SB.PCI0.P0P6");
>  	eeepc_register_rfkill_notifier("\\_SB.PCI0.P0P7");

Re: [PATCH] eeepc-laptop: fix hot-unplug on resume

[Alan Jenkins]

Rafael J. Wysocki wrote:
> On Monday 29 June 2009, Alan Jenkins wrote:
>   
>> The patch below fixes a regression introduced by the rfkill rewrite. 
>> Please consider it for inclusion in 2.6.31 via the ACPI tree.
>>     
>
> Is there a Bugzilla # for this regression?
>
> Rafael
>   

No.

I found it in testing, a few days after I'd submitted the change myself :-/.

Thanks
Alan