From: Michal Januszewski <spock@gentoo.org>
Date: Mon, 2 Apr 2007 06:49:51 +0000 (-0700)
Subject: [PATCH] vt: fix potential race in VT_WAITACTIVE handler
X-Git-Tag: v2.6.21-rc6~25
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f991519c197534811046e5e47389b6fafcdf1e48;p=pandora-kernel.git

[PATCH] vt: fix potential race in VT_WAITACTIVE handler

On a multiprocessor machine the VT_WAITACTIVE ioctl call may return 0 if
fg_console has already been updated in redraw_screen() but the console
switch itself hasn't been completed.  Fix this by checking fg_console in
vt_waitactive() with the console sem held.

Signed-off-by: Michal Januszewski <spock@gentoo.org>
Acked-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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