lkml.org 
[lkml]   [2014]   [Apr]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 1/1] ahci: Do not receive interrupts sent by dummy ports
On Thu, Apr 17, 2014 at 06:06:15PM +0200, Alexander Gordeev wrote:
> In multiple MSI mode all AHCI ports (including dummy) get
> assigned separate MSI vectors and (as result of execution
> pci_enable_msi_exact() function) separate IRQ numbers,
> (mapped to the MSI vectors).
>
> Therefore, although interrupts from dummy ports are not
> desired they are still enabled. We do not request IRQs
> for dummy ports, but that only means we do not assign
> AHCI-specific ISRs to corresponding IRQ numbers.
>
> As result, dummy port interrupts still could come and
> traverse all the way from the PCI device to the kernel,
> causing unnecessary overhead.
>
> This update disables IRQs for dummy ports and prevents
> the described issue.
>
> Signed-off-by: Alexander Gordeev <agordeev@redhat.com>
> Cc: Tejun Heo <tj@kernel.org>
> Cc: David Milburn <dmilburn@redhat.com>
> Cc: linux-ide@vger.kernel.org

Applied to libata/for-3.15-fixes w/ David's tested-by added.

Thanks.

--
tejun


\
 
 \ /
  Last update: 2014-04-18 22:21    [W:0.294 / U:0.128 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site