xhci might run with MSI/MSI-X only, with no support for legacy
interrupts. On these devices the request_irq() call in usb_add_hcd()
will fail, causing the entire device to fail.
For xhci this is especially painful as the driver will enable
interrupts during xhci_run(), so the initial call to request_irq()
is not required anyway.
This patch adds a flag 'msix_supported' to struct usb_hcd, which
will cause usb_add_hcd() to skip interrupt setup. This flag is
set in xhci-pci, so the registration will skip the first request_irq()
and can proceed.
Cc: Bjorn Helgaas <bhelg...@google.com>
Cc: Oliver Neukum <oneu...@suse.de>
Cc: Thomas Renninger <tr...@suse.de>
Cc: Yinghai Lu <ying...@kernel.org>
Cc: Frederik Himpe <fhi...@vub.ac.be>
Cc: David Haerdeman <da...@hardeman.nu>
Signed-off-by: Hannes Reinecke <h...@suse.de>
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index 8e64adf..e583444 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -2536,7 +2536,7 @@ int usb_add_hcd(struct usb_hcd *hcd,
/* enable irqs just before we start the controller,
* if the BIOS provides legacy PCI irqs.
*/
- if (usb_hcd_is_primary_hcd(hcd) && irqnum) {
+ if (usb_hcd_is_primary_hcd(hcd) && irqnum && !hcd->msix_supported) {
retval = usb_hcd_request_irqs(hcd, irqnum, irqflags);
if (retval)
goto err_request_irq;
diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index af259e0..a08c0ee 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -183,6 +183,12 @@ static int xhci_pci_probe(struct pci_dev *dev, const
struct pci_device_id *id)
*/
*((struct xhci_hcd **) xhci->shared_hcd->hcd_priv) = xhci;
+ /*
+ * Interrupts are setup during xhci_run(), so do not try
+ * to request an interrupt during hcd init.
+ */
+ hcd->msix_supported = 1;
+
retval = usb_add_hcd(xhci->shared_hcd, dev->irq,
IRQF_SHARED);
if (retval)
diff --git a/include/linux/usb/hcd.h b/include/linux/usb/hcd.h
index 0a78df5..eb6bf10 100644
--- a/include/linux/usb/hcd.h
+++ b/include/linux/usb/hcd.h
@@ -124,6 +124,7 @@ struct usb_hcd {
/* Flags that get set only during HCD registration or removal. */
unsigned rh_registered:1;/* is root hub registered? */
unsigned rh_pollable:1; /* may we poll the root hub? */
+ unsigned msix_supported:1; /* driver supports MSI-X */
unsigned msix_enabled:1; /* driver has MSI-X enabled? */
/* The next flag is a stopgap, to be removed when all the HCDs
--
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