From 6840a1e10529e7142e22c7308d7db4b4fa9a6d8f Mon Sep 17 00:00:00 2001 From: Hans de Goede Date: Wed, 4 Jan 2012 23:29:18 +0100 Subject: [PATCH] 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 Signed-off-by: Sarah Sharp Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/xhci.c | 1 + drivers/usb/host/xhci.h | 1 - 2 files changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index 10dc1bdf3a7..004bcab1778 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -1568,6 +1568,7 @@ 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; diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h index 1fb0549b771..c149d200415 100644 --- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -900,7 +900,6 @@ 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 -- 2.11.4.GIT