From: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Date: Tue, 30 Oct 2007 19:46:24 +0000 (-0200)
Subject: ACPI: thinkpad-acpi: allow for syscall restart in sysfs handlers
X-Git-Tag: v2.6.24-rc4~107^2~3^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fc589a3ce5f38db6239c147da4f9172a25575ecc;p=pandora-kernel.git

ACPI: thinkpad-acpi: allow for syscall restart in sysfs handlers

Map an mutex_lock_interruptible() error return into ERESTARTSYS, as the
only possible error from mutex_lock_interruptible is EINTR, and that will
only happen if signal_pending() causes the mutex lock attempt to abort.

This still allows signals to be delivered ASAP, which is much nicer than
just doing mutex_lock, and still shadows userspace from EINTR when
SA_RESTART is active.

Problem reported by Peter Jordan.

Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Cc: Jean Delvare <khali@linux-fr.org>
Cc: Peter Jordan <usernetwork@gmx.info>
Cc: Richard Neill <rn214@hermes.cam.ac.uk>
Signed-off-by: Len Brown <len.brown@intel.com>
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