From: Adrian Huang <ahuang12@xxxxxxxxxx> When some xHCI host controllers fall back to use the legacy IRQ, the member irq_descr of the usb_hcd structure will be empty. This leads to the empty string of the xHCI host controller in /proc/interrupts. Here is the example (The irq 19 is the xHCI host controller): CPU0 0: 91 IO-APIC-edge timer 8: 1 IO-APIC-edge rtc0 9: 7191 IO-APIC-fasteoi acpi 18: 104 IR-IO-APIC-fasteoi ehci_hcd:usb1, ehci_hcd:usb2 19: 473 IR-IO-APIC-fasteoi After applying the patch, the name of the registered xHCI host controller can be displayed correctly. Here is the example: CPU0 0: 91 IO-APIC-edge timer 8: 1 IO-APIC-edge rtc0 9: 7191 IO-APIC-fasteoi acpi 18: 104 IR-IO-APIC-fasteoi ehci_hcd:usb1, ehci_hcd:usb2 19: 473 IR-IO-APIC-fasteoi xhci_hcd:usb3 Tested on v3.14-rc4. Signed-off-by: Adrian Huang <ahuang12@xxxxxxxxxx> Reviewed-by: Nagananda Chumbalkar <nchumbalkar@xxxxxxxxxx> Signed-off-by: Sarah Sharp <sarah.a.sharp@xxxxxxxxxxxxxxx> --- drivers/usb/host/xhci.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index 1db3c2794a49..652be2138b4b 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -390,6 +390,10 @@ static int xhci_try_enable_msi(struct usb_hcd *hcd) } legacy_irq: + if (!strlen(hcd->irq_descr)) + snprintf(hcd->irq_descr, sizeof(hcd->irq_descr), "%s:usb%d", + hcd->driver->description, hcd->self.busnum); + /* fall back to legacy interrupt*/ ret = request_irq(pdev->irq, &usb_hcd_irq, IRQF_SHARED, hcd->irq_descr, hcd); -- 1.8.5.5 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html