linux-kernel - Re: [PATCH] sk98lin: handle pci_enable_device() return value in skge

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Message-ID: <87mz33940d.fsf@sw.ru>
Date:	Sat, 24 Feb 2007 14:41:38 +0300
From:	Dmitriy Monakhov <dmonakhov@...nvz.org>
To:	Dmitriy Monakhov <dmonakhov@...nvz.org>
Cc:	Jiri Kosina <jikos@...os.cz>, Andrew Morton <akpm@...l.org>,
	Stephen Hemminger <shemminger@...l.org>,
	mlindner@...konnect.de, rroesler@...konnect.de,
	Jeff Garzik <jeff@...zik.org>, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH] sk98lin: handle pci_enable_device() return value in skge_resume()

Dmitriy Monakhov <dmonakhov@...nvz.org> writes:

> This thread looks dead but issue was't fixed.
>
> Jiri Kosina <jikos@...os.cz> writes:
>>> > -	pci_enable_device(pdev);
>>> > +	ret = pci_enable_device(pdev);
>>> > +	if (ret) {
>>> > +		printk(KERN_ERR "sk98lin: Cannot enable PCI device %s during resume\n", 
>>> > +				dev->name);
>>> > +		unregister_netdev(dev);
>>> This looks rather wrong - skge_exit() will run unregister_netdev() again.
>>
>> You are of course right (the problem was also spotted by Russell King). 
>> This I believe is the correct one for the sk98lin case.
>>
>> [PATCH] fix sk98lin driver, ignoring return value from pci_enable_device()
>>
>> add check of return value to _resume() function of sk98lin driver.
>>
>> Signed-off-by: Jiri Kosina <jikos@...os.cz>
>>
>> ---
>>
>> --- a/drivers/net/sk98lin/skge.c
>> +++ b/drivers/net/sk98lin/skge.c
>> @@ -5070,7 +5070,12 @@ static int skge_resume(struct pci_dev *p
>>  
>>  	pci_set_power_state(pdev, PCI_D0);
>>  	pci_restore_state(pdev);
>> -	pci_enable_device(pdev);
>> +	ret = pci_enable_device(pdev);
>> +	if (ret) {
>> +		printk(KERN_WARNING "sk98lin: unable to enable device %s in resume\n",
>> +				dev->name);
>> +		goto out_err;
>> +	}	
> [snip]
>> +out_err:
>> +	pAC->AllocFlag &= ~SK_ALLOC_IRQ;
>> +	dev->irq = 0;
>> +	pci_disable_device(pdev);
> <<<<< Ok what happend if we jump here right after pci_disable_device() has 
 OOPs.....Of course i mean pci_enable_device() here^^^^^^^^^^^^^^^^^^^^^
 I'm sorry about this. (Option complete_word not always good, some times 
 brain work required too :) )
 So correct comment looks like:
  <<<<< Ok what happend if we jump here right after pci_enable_device() has
        failed, but pci_disable_device() was called anyway, this is wrong and 
        may be fatal because pdev->enable_cnt may becomes negative.  
>> +
>> +	return ret;
>> +
>>  }
>>  #else
>>  #define skge_suspend NULL
> This is reworked Jiri's patch:
>
> [PATCH] sk98lin: handle pci_enable_device() return value in skge_resume()
>
> Signed-off-by: Monakhov Dmitriy <dmonakhov@...nvz.org>
> ---
>  drivers/net/sk98lin/skge.c |   20 +++++++++++++++-----
>  1 files changed, 15 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/net/sk98lin/skge.c b/drivers/net/sk98lin/skge.c
> index e94ab25..eea753a 100644
> --- a/drivers/net/sk98lin/skge.c
> +++ b/drivers/net/sk98lin/skge.c
> @@ -5125,7 +5125,12 @@ static int skge_resume(struct pci_dev *pdev)
>  
>  	pci_set_power_state(pdev, PCI_D0);
>  	pci_restore_state(pdev);
> -	pci_enable_device(pdev);
> +	ret = pci_enable_device(pdev);
> +	if (ret) {
> +		printk(KERN_WARNING "sk98lin: unable to enable device %s "
> +				"in resume\n", dev->name);
> +		goto err_out;
> +	}	
>  	pci_set_master(pdev);
>  	if (pAC->GIni.GIMacsFound == 2)
>  		ret = request_irq(dev->irq, SkGeIsr, IRQF_SHARED, "sk98lin", dev);
> @@ -5133,10 +5138,8 @@ static int skge_resume(struct pci_dev *pdev)
>  		ret = request_irq(dev->irq, SkGeIsrOnePort, IRQF_SHARED, "sk98lin", dev);
>  	if (ret) {
>  		printk(KERN_WARNING "sk98lin: unable to acquire IRQ %d\n", dev->irq);
> -		pAC->AllocFlag &= ~SK_ALLOC_IRQ;
> -		dev->irq = 0;
> -		pci_disable_device(pdev);
> -		return -EBUSY;
> +		ret = -EBUSY;
> +		goto err_out_disable_pdev;
>  	}
>  
>  	netif_device_attach(dev);
> @@ -5153,6 +5156,13 @@ static int skge_resume(struct pci_dev *pdev)
>  	}
>  
>  	return 0;
> +
> +err_out_disable_pdev:
> +	pci_disable_device(pdev);
> +err_out:
> +	pAC->AllocFlag &= ~SK_ALLOC_IRQ;
> +	dev->irq = 0;
> +	return ret;
>  }
>  #else
>  #define skge_suspend NULL
> -- 
> 1.4.4.4
>
>
>
> -
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