linux-kernel - Re: [ 069/100] e1000e: fix pci-device enable-counter balance

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Date:	Wed, 13 Mar 2013 11:52:22 +0400
From:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	Bruce Allan <bruce.w.allan@...el.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Borislav Petkov <bp@...e.de>,
	Aaron Brown <aaron.f.brown@...el.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: Re: [ 069/100] e1000e: fix pci-device enable-counter balance

Greg Kroah-Hartman wrote:
> 3.8-stable review patch.  If anyone has any objections, please let me know.

Vivek Goyal reported about problem caused by this improper fix.

https://lkml.org/lkml/2013/3/12/529

(this patch also pending to 3.0-stable and 3.4-stable)

>
> ------------------
>
> From: Konstantin Khlebnikov<khlebnikov@...nvz.org>
>
> commit 4e0855dff094b0d56d6b5b271e0ce7851cc1e063 upstream.
>
> This patch removes redundant and unbalanced pci_disable_device() from
> __e1000_shutdown(). pci_clear_master() is enough, device can go into
> suspended state with elevated enable_cnt.
>
> Bug was introduced in commit 23606cf5d1192c2b17912cb2ef6e62f9b11de133
> ("e1000e / PCI / PM: Add basic runtime PM support (rev. 4)") in v2.6.35
>
> Signed-off-by: Konstantin Khlebnikov<khlebnikov@...nvz.org>
> Cc: Bruce Allan<bruce.w.allan@...el.com>
> Acked-by: Rafael J. Wysocki<rafael.j.wysocki@...el.com>
> Tested-by: Borislav Petkov<bp@...e.de>
> Tested-by: Aaron Brown<aaron.f.brown@...el.com>
> Signed-off-by: Jeff Kirsher<jeffrey.t.kirsher@...el.com>
> Signed-off-by: Greg Kroah-Hartman<gregkh@...uxfoundation.org>
>
> ---
>   drivers/net/ethernet/intel/e1000e/netdev.c |    2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> --- a/drivers/net/ethernet/intel/e1000e/netdev.c
> +++ b/drivers/net/ethernet/intel/e1000e/netdev.c
> @@ -5549,7 +5549,7 @@ static int __e1000_shutdown(struct pci_d
>   	 */
>   	e1000e_release_hw_control(adapter);
>
> -	pci_disable_device(pdev);
> +	pci_clear_master(pdev);
>
>   	return 0;
>   }
>
>

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