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@xxxxxxxxxx> > Cc: Tejun Heo <tj@xxxxxxxxxx> > Cc: David Milburn <dmilburn@xxxxxxxxxx> > Cc: linux-ide@xxxxxxxxxxxxxxx Applied to libata/for-3.15-fixes w/ David's tested-by added. Thanks. -- tejun -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
