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authorJeff Dike <jdike@addtoit.com>2007-02-10 01:43:52 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-02-11 10:51:21 -0800
commitd79a580936396bbcd2f4fae2c6215f9cf81e3c0d (patch)
tree72c91c7475e2562c5459c4d6d0499cdd671e0b50 /Documentation/sh
parent5cf885d01f30be710a339976c485f92bb8a8946d (diff)
downloadblackbird-op-linux-d79a580936396bbcd2f4fae2c6215f9cf81e3c0d.tar.gz
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[PATCH] uml: console locking fixes
Clean up the console driver locking. There are various problems here, including sleeping under a spinlock and spinlock recursion, some of which are fixed here. This patch deals with the locking involved with opens and closes. The problem is that an mconsole request to change a console's configuration can race with an open. Changing a configuration should only be done when a console isn't opened. Also, an open must be looking at a stable configuration. In addition, a get configuration request must observe the same locking since it must also see a stable configuration. With the old locking, it was possible for this to hang indefinitely in some cases because open would block for a long time waiting for a connection from the host while holding the lock needed by the mconsole request. As explained in the long comment, this is fixed by adding a spinlock for the use count and configuration and a mutex for the actual open and close. Signed-off-by: Jeff Dike <jdike@addtoit.com> Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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