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authorAlan Stern <stern@rowland.harvard.edu>2009-05-28 00:21:56 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2009-06-16 06:44:46 +0200
commitb18ffd49e86102a9ed0a1cc83fdafe3891e844e5 (patch)
tree78b60211d13839baaa92128e1b583dc12139392c /drivers/usb/host/ehci-fsl.c
parentUSB: r8a66597-hcd: use platform_data instead of module_param (diff)
downloadlinux-b18ffd49e86102a9ed0a1cc83fdafe3891e844e5.tar.xz
linux-b18ffd49e86102a9ed0a1cc83fdafe3891e844e5.zip
USB: EHCI: update toggle state for linked QHs
This patch (as1245) fixes a bug in ehci-hcd. When an URB is queued for an endpoint whose QH is already in the LINKED state, the QH doesn't get refreshed. As a result, if usb_clear_halt() was called during the time that the QH was linked but idle, the data toggle value in the QH doesn't get reset. The symptom is that after a clear_halt, data gets lost and transfers time out. This problem is starting to show up now because the "ehci-hcd unlink speedups" patch causes QHs with no queued URBs to remain linked for a suitable time. The patch utilizes the new endpoint_reset mechanism to fix the problem. When an endpoint is reset, the new method forcibly unlinks the QH (if necessary) and safely updates the toggle value. This allows qh_update() to be simplified and avoids using usb_device's toggle bits in a rather unintuitive way. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> CC: David Brownell <david-b@pacbell.net> Tested-by: David <david@unsolicited.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/host/ehci-fsl.c')
-rw-r--r--drivers/usb/host/ehci-fsl.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/usb/host/ehci-fsl.c b/drivers/usb/host/ehci-fsl.c
index 01c3da34f678..bf86809c5120 100644
--- a/drivers/usb/host/ehci-fsl.c
+++ b/drivers/usb/host/ehci-fsl.c
@@ -309,6 +309,7 @@ static const struct hc_driver ehci_fsl_hc_driver = {
.urb_enqueue = ehci_urb_enqueue,
.urb_dequeue = ehci_urb_dequeue,
.endpoint_disable = ehci_endpoint_disable,
+ .endpoint_reset = ehci_endpoint_reset,
/*
* scheduling support