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| author |   Hans de Goede <hdegoede@redhat.com> | 2012-01-04 23:29:18 +0100 |
|---|---|---|
| committer |   Sarah Sharp <sarah.a.sharp@linux.intel.com> | 2012-01-04 15:50:28 -0800 |
| commit | 71d85724bdd947a3b42a88d08af79f290a1a767b (patch) | |
| tree | b31a7e28bd209bfd8cc6706f6dc84037a14bd48f /drivers/usb/host/xhci.c | |
| parent | USB: remove dead code from suspend/resume path (diff) | |
| download | linux-dev-71d85724bdd947a3b42a88d08af79f290a1a767b.tar.xz linux-dev-71d85724bdd947a3b42a88d08af79f290a1a767b.zip | |
xhci: Properly handle COMP_2ND_BW_ERR
I encountered a result of COMP_2ND_BW_ERR while improving how the pwc
webcam driver handles not having the full usb1 bandwidth available to
itself.
I created the following test setup, a NEC xhci controller with a
single TT USB 2 hub plugged into it, with a usb keyboard and a pwc webcam
plugged into the usb2 hub. This caused the following to show up in dmesg
when trying to stream from the pwc camera at its highest alt setting:
xhci_hcd 0000:01:00.0: ERROR: unexpected command completion code 0x23.
usb 6-2.1: Not enough bandwidth for altsetting 9
And usb_set_interface returned -EINVAL, which caused my pwc code to not
do the right thing as it expected -ENOSPC.
This patch makes the xhci driver properly handle COMP_2ND_BW_ERR and makes
usb_set_interface return -ENOSPC as expected.
This should be backported to stable kernels as old as 2.6.32.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Cc: stable@vger.kernel.org
Diffstat (limited to 'drivers/usb/host/xhci.c')
| -rw-r--r-- | drivers/usb/host/xhci.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index f3d0b8d96440..6693de7ce03f 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -1623,6 +1623,7 @@ static int xhci_configure_endpoint_result(struct xhci_hcd *xhci, /* FIXME: can we allocate more resources for the HC? */ break; case COMP_BW_ERR: + case COMP_2ND_BW_ERR: dev_warn(&udev->dev, "Not enough bandwidth " "for new device state.\n"); ret = -ENOSPC; |