USB: EHCI: add software retry for transaction errors

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upstream commit: a2c2706e10

This patch (as1204) adds a software retry mechanism to ehci-hcd.  It
gets invoked when the driver encounters transaction errors on an
asynchronous endpoint.  On many systems, hardware deficiencies cause
such errors to occur if one device is unplugged while the host is
communicating with another device.  With the patch, the failed
transactions are retried and generally succeed the second or third
time through.

This is based on code originally written by Koichiro Saito.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Tested by: Koichiro Saito <Saito.Koichiro@adniss.jp>
CC: David Brownell <david-b@pacbell.net>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>

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Alan Stern 2009-03-26 18:25:05 +00:00 • committed by Chris Wright

parent ce2a2dc252

commit 39f8c8a3ef

2 changed files with 35 additions and 0 deletions

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32

drivers/usb/host/ehci-q.c

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3

drivers/usb/host/ehci.h

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