From: Alexander Gordeev <lasaine@lvk.cs.msu.su>
Date: Thu, 13 Jan 2011 01:00:53 +0000 (-0800)
Subject: pps: make idr lock a mutex and protect idr_pre_get
X-Git-Tag: v2.6.38-rc1~288
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2a5cd6e2fb1984cc83f08b3645bf394830ac7825;p=pandora-kernel.git

pps: make idr lock a mutex and protect idr_pre_get

Now pps_idr_lock is never used in interrupt context so we can replace
spin_lock_irq/spin_unlock_irq with plain spin_lock/spin_unlock. But
there is also a potential race condition when someone can steal an id
which was allocated by idr_pre_get before it is used. So convert spin
lock to mutex and protect the whole id generation process.

Signed-off-by: Alexander Gordeev <lasaine@lvk.cs.msu.su>
Cc: Rodolfo Giometti <giometti@linux.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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