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authorAlan Stern <stern@rowland.harvard.edu>2008-09-03 16:38:32 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2008-10-17 14:40:54 -0700
commit4a511bc3f5829bc18428bcf11c25417a79d09396 (patch)
treed2512a4e4cdf680f297e0af8be6566f9f95fdfb7 /Documentation
parent8bfa24727087d7252f9ecfb5fea2dfc92d797fbd (diff)
downloadop-kernel-dev-4a511bc3f5829bc18428bcf11c25417a79d09396.zip
op-kernel-dev-4a511bc3f5829bc18428bcf11c25417a79d09396.tar.gz
OHCI: Allow broken controllers to auto-stop
This patch (as1134) attempts to improve the way we handle OHCI controllers with broken Root Hub Status Change interrupt support. In these controllers the RHSC interrupt bit essentially never turns off, making RHSC interrupts useless -- they have to remain permanently disabled. Such controllers should still be allowed to turn off their root hubs when no devices are attached. Polling for new connections can continue while the root hub is suspended. The patch implements this feature. (It won't have much effect unless CONFIG_PM is enabled and CONFIG_USB_SUSPEND is disabled, but since the overhead is very small we may as well do it.) Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Cc: stable <stable@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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