From: Oleg Nesterov <oleg@redhat.com>
Date: Tue, 23 Jul 2013 15:26:10 +0000 (+0200)
Subject: tracing: Change tracing_fops/snapshot_fops to rely on tracing_get_cpu()
X-Git-Tag: v3.11-rc3~2^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6484c71cbc170634fa131b6d022d86d61686b88b;p=pandora-kernel.git

tracing: Change tracing_fops/snapshot_fops to rely on tracing_get_cpu()

tracing_open() and tracing_snapshot_open() are racy, the memory
inode->i_private points to can be already freed.

Convert these last users of "inode->i_private == trace_cpu" to
use "i_private = trace_array" and rely on tracing_get_cpu().

v2: incorporate the fix from Steven, tracing_release() must not
    blindly dereference file->private_data unless we know that
    the file was opened for reading.

Link: http://lkml.kernel.org/r/20130723152610.GA23737@redhat.com

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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