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Date: Thu, 17 Apr 2014 13:06:41 -0400 From: Tejun Heo <tj@...nel.org> To: Alexander Gordeev <agordeev@...hat.com> Cc: linux-kernel@...r.kernel.org, David Milburn <dmilburn@...hat.com>, linux-ide@...r.kernel.org Subject: Re: [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@...hat.com> > Cc: Tejun Heo <tj@...nel.org> > Cc: David Milburn <dmilburn@...hat.com> > Cc: linux-ide@...r.kernel.org David, can you please test the patch? Thanks. -- tejun -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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