irq allocation for pci drivers

irq allocation for pci drivers

[KY Srinivasan]

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Greg,

Has something changed in the PCI code in the Linux-next tree - 2.6.39-rc1-12 with
regards to irq allocation? Earlier (a few weeks ago), the vmbus driver would get the irq allocated as part
of it being now a pci driver. Currently, however the system is setting pdev->irq to
0 and needless to say, request_irq() is failing.

Thanks,

K. Y

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Re: irq allocation for pci drivers

[Greg KH]

On Tue, Apr 12, 2011 at 11:57:22PM +0000, KY Srinivasan wrote:
> Greg,
> 
>  
> 
> Has something changed in the PCI code in the Linux-next tree – 2.6.39-rc1-12
> with
> 
> regards to irq allocation? Earlier (a few weeks ago), the vmbus driver would
> get the irq allocated as part
> 
> of it being now a pci driver. Currently, however the system is setting pdev->
> irq to
> 
> 0 and needless to say, request_irq() is failing.

{sigh}  Please fix your email client...

Anyway, I have no idea, please use 'git bisect' to track down the
problem commit that causes this.

thanks,

greg k-h

RE: irq allocation for pci drivers

[KY Srinivasan]

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> -----Original Message-----
> From: Greg KH [mailto:gregkh@suse.de]
> Sent: Tuesday, April 12, 2011 11:41 PM
> To: KY Srinivasan
> Cc: linux-kernel@vger.kernel.org; devel@linuxdriverproject.org;
> virtualization@lists.osdl.org
> Subject: Re: irq allocation for pci drivers
> 
> On Tue, Apr 12, 2011 at 11:57:22PM +0000, KY Srinivasan wrote:
> > Greg,
> 
> Anyway, I have no idea, please use 'git bisect' to track down the
> problem commit that causes this.

Greg,

This problem turned out to be on the host side. We don't have any issue with dynamic
irq allocation on the win2k8 r2 hosts. Some older hosts have an issue and in any event
it does not look like it is a  Linux issue.

Regards,

K. Y
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RE: irq allocation for pci drivers

[KY Srinivasan]

> -----Original Message-----
> From: Greg KH [mailto:gregkh@suse.de]
> Sent: Tuesday, April 12, 2011 11:41 PM
> To: KY Srinivasan
> Cc: linux-kernel@vger.kernel.org; devel@linuxdriverproject.org;
> virtualization@lists.osdl.org
> Subject: Re: irq allocation for pci drivers
> 
> On Tue, Apr 12, 2011 at 11:57:22PM +0000, KY Srinivasan wrote:
> > Greg,
> 
> Anyway, I have no idea, please use 'git bisect' to track down the
> problem commit that causes this.

Greg,

This problem turned out to be on the host side. We don't have any issue with dynamic
irq allocation on the win2k8 r2 hosts. Some older hosts have an issue and in any event
it does not look like it is a  Linux issue.

Regards,

K. Y