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authorAlan Stern <stern@rowland.harvard.edu>2006-11-22 16:55:54 -0500
committerGreg Kroah-Hartman <gregkh@suse.de>2006-12-01 14:25:52 -0800
commitee49fb5dc89d34f1794ac9362fa97c1a640f7ddd (patch)
tree310d11b695b631c091c9f442d566400ba9a86de9 /sound
parentd25450c68767481f7c9cc4823a6da8235db40be6 (diff)
downloadlinux-2.6.34-ux500-ee49fb5dc89d34f1794ac9362fa97c1a640f7ddd.tar.gz
USB: keep count of unsuspended children
This patch (as818b) simplifies autosuspend processing by keeping track of the number of unsuspended children of each USB hub. This will permit us to avoid a good deal of unnecessary work all the time; we will no longer have to create a bunch of workqueue entries to carry out autosuspend requests, only to have them fail because one of the hub's children isn't suspended. The basic idea is simple. There already is a usage counter in the usb_device structure for preventing autosuspends. The patch just increments that counter for every unsuspended child. There's only one tricky part: When a device disconnects we need to remember whether it was suspended at the time (leave the counter alone) or not (decrement the counter). Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'sound')
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