tree 6fc0d50a4d286df33b18f21e0994b09637d0c6c8
parent 77f46328fb83b64befd889ebce6d7fb959932509
author Matthew Dharm <mdharm-usb@one-eyed-alien.net> 1122587150 -0700
committer Greg Kroah-Hartman <gregkh@suse.de> 1126221775 -0700

[PATCH] USB Storage: close a race condition in disconnect near queuecommand

This patch started life as as534, and has been re-diffed against the latest
tree.

usb-storage has a small loophole, a window between the time queuecommand
accepts a new command and the time the control thread starts to execute
it.  If disconnect is called during that window, the driver won't cancel
the pending command -- we've been relying on the SCSI core to cancel it
for us during host removal.  But it's better for usb-storage to cancel
it;  this avoids races and reduces reliance on the SCSI core.
Fortunately cancelling these commands is easy to do; the key is to do it
_before_ calling scsi_remove_host.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Matthew Dharm <mdharm-usb@one-eyed-alien.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>