From: Ingo Molnar <mingo@elte.hu>
Date: Tue, 18 Nov 2008 14:23:08 +0000 (+0100)
Subject: x86, PEBS/DS: fix code flow in ds_request()
X-Git-Tag: v2.6.28-rc6~14^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=10db4ef7b9a65b86e4d047671a1886f4c101a859;p=pandora-kernel.git

x86, PEBS/DS: fix code flow in ds_request()

this compiler warning:

  arch/x86/kernel/ds.c: In function 'ds_request':
  arch/x86/kernel/ds.c:368: warning: 'context' may be used uninitialized in this function

Shows that the code flow in ds_request() is buggy - it goes into
the unlock+release-context path even when the context is not allocated
yet.

First allocate the context, then do the other checks.

Also, take care with GFP allocations under the ds_lock spinlock.

Cc: <stable@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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