From: Michael Schmitz <schmitzmic@gmail.com>
Date: Sat, 1 Feb 2014 00:48:13 +0000 (+1300)
Subject: m68k/atari - ide: do not register interrupt if host->get_lock is set
X-Git-Tag: omap-for-v3.17/fixes-against-rc2~246^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a259d5320537576c0744238f01ca6e75ad776674;p=pandora-kernel.git

m68k/atari - ide: do not register interrupt if host->get_lock is set

On m68k, host->get_lock is used to both lock and register the interrupt
that the IDE host shares with other device drivers. Registering the
IDE interrupt handler in ide-probe.c results in duplicating the
interrupt registered (once via host->get lock, and also via init_irq()),
and may result in IDE accepting interrupts even when another driver has
locked the interrupt hardware. This opens the whole locking scheme up
to races.

host->get_lock is set on m68k only, so other drivers' behaviour is not
changed.

Signed-off-by: Michael Schmitz <schmitz@debian.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: David S. Miller <davem@davemloft.net>
Cc: linux-ide@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>
---

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