@@ -1171,12 +1171,16 @@ int ahci_host_activate(struct ata_host *host, int irq, unsigned int n_msis)
for (i = 0; i < host->n_ports; i++) {
struct ahci_port_priv *pp = host->ports[i]->private_data;
- /* pp is NULL for dummy ports */
- if (pp)
- rc = devm_request_threaded_irq(host->dev,
- irq + i, ahci_hw_interrupt,
- ahci_thread_fn, IRQF_SHARED,
- pp->irq_desc, host->ports[i]);
+ /* Do not receive interrupts sent by dummy ports */
+ if (!pp) {
+ disable_irq(irq + i);
+ continue;
+ }
+
+ rc = devm_request_threaded_irq(host->dev, irq + i,
+ ahci_hw_interrupt,
+ ahci_thread_fn, IRQF_SHARED,
+ pp->irq_desc, host->ports[i]);
if (rc)
goto out_free_irqs;
}
This is a note to let you know that I have just added a patch titled ahci: Do not receive interrupts sent by dummy ports to the linux-3.13.y-queue branch of the 3.13.y.z extended stable tree which can be found at: http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.13.y-queue This patch is scheduled to be released in version 3.13.11.3. If you, or anyone else, feels it should not be added to this tree, please reply to this email. For more information about the 3.13.y.z tree, see https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable Thanks. -Kamal ------ From 92cee439ba690337e4831e4a8ac86405118d4ca8 Mon Sep 17 00:00:00 2001 From: Alexander Gordeev <agordeev@redhat.com> Date: Thu, 17 Apr 2014 18:06:15 +0200 Subject: ahci: Do not receive interrupts sent by dummy ports commit 2cf532f5e67c0cfe38c8c100e49280cdadacd2be upstream. 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> Signed-off-by: Tejun Heo <tj@kernel.org> Tested-by: David Milburn <dmilburn@redhat.com> Cc: linux-ide@vger.kernel.org Fixes: 5ca72c4f7c41 ("AHCI: Support multiple MSIs") Signed-off-by: Kamal Mostafa <kamal@canonical.com> --- drivers/ata/ahci.c | 16 ++++++++++------ 1 file changed, 10 insertions(+), 6 deletions(-) -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html