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| author | Sarah Sharp <sarah.a.sharp@linux.intel.com> | 2012-02-13 16:25:57 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-02-29 16:31:08 -0800 |
| commit | 4d5845033ef313d6d1008ac5dafe69dbab23cc11 (patch) | |
| tree | 20752953009f6837b5cc62b40224ebbde9bf0f11 /drivers/usb/host/xhci.c | |
| parent | 0eec53088be92edf907c345ff96d94059d89f124 (diff) | |
| download | kernel_samsung_smdk4412-4d5845033ef313d6d1008ac5dafe69dbab23cc11.zip kernel_samsung_smdk4412-4d5845033ef313d6d1008ac5dafe69dbab23cc11.tar.gz kernel_samsung_smdk4412-4d5845033ef313d6d1008ac5dafe69dbab23cc11.tar.bz2 | |
USB: Don't fail USB3 probe on missing legacy PCI IRQ.
commit 68d07f64b8a11a852d48d1b05b724c3e20c0d94b upstream.
Intel has a PCI USB xhci host controller on a new platform. It doesn't
have a line IRQ definition in BIOS. The Linux driver refuses to
initialize this controller, but Windows works well because it only depends
on MSI.
Actually, Linux also can work for MSI. This patch avoids the line IRQ
checking for USB3 HCDs in usb core PCI probe. It allows the xHCI driver
to try to enable MSI or MSI-X first. It will fail the probe if MSI
enabling failed and there's no legacy PCI IRQ.
This patch should be backported to kernels as old as 2.6.32.
Signed-off-by: Alex Shi <alex.shi@intel.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/host/xhci.c')
| -rw-r--r-- | drivers/usb/host/xhci.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index b33f059..034f554 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -352,6 +352,11 @@ static int xhci_try_enable_msi(struct usb_hcd *hcd) /* hcd->irq is -1, we have MSI */ return 0; + if (!pdev->irq) { + xhci_err(xhci, "No msi-x/msi found and no IRQ in BIOS\n"); + return -EINVAL; + } + /* fall back to legacy interrupt*/ ret = request_irq(pdev->irq, &usb_hcd_irq, IRQF_SHARED, hcd->irq_descr, hcd); |