path: root/drivers/usb
diff options
authorHans de Goede <hdegoede@redhat.com>2012-01-04 23:29:18 +0100
committerGreg Kroah-Hartman <gregkh@suse.de>2012-01-12 11:29:43 -0800
commit5b511b783385bc68663e4729be7f169ce3061e6d (patch)
treeef3e9794fa8cdaf393725860ffa29e6eafd2f056 /drivers/usb
parent4781ace0ddff8057f2c1bf1811ae4886f8b88876 (diff)
xhci: Properly handle COMP_2ND_BW_ERR
commit 71d85724bdd947a3b42a88d08af79f290a1a767b upstream. 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> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb')
2 files changed, 1 insertions, 1 deletions
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index a1afb7c39f7..36f9dd81c49 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -1620,6 +1620,7 @@ static int xhci_configure_endpoint_result(struct xhci_hcd *xhci,
/* FIXME: can we allocate more resources for the HC? */
+ case COMP_2ND_BW_ERR:
dev_warn(&udev->dev, "Not enough bandwidth "
"for new device state.\n");
ret = -ENOSPC;
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index 3c8fbd2772e..09eda3a8e51 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -1033,7 +1033,6 @@ struct xhci_transfer_event {
/* Invalid Stream ID Error */
#define COMP_STRID_ERR 34
/* Secondary Bandwidth Error - may be returned by a Configure Endpoint cmd */
-/* FIXME - check for this */
#define COMP_2ND_BW_ERR 35
/* Split Transaction Error */
#define COMP_SPLIT_ERR 36