From: Vitaly Mayatskikh <v.mayatskih@gmail.com>
Date: Sun, 28 Sep 2008 23:24:33 +0000 (+0000)
Subject: powerpc: Honor O_NONBLOCK flag when reading RTAS log
X-Git-Tag: v2.6.28-rc1~569^2~37
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=76c31f239ea221a6c84bd26141262a43bfe8b7f4;p=pandora-kernel.git

powerpc: Honor O_NONBLOCK flag when reading RTAS log

rtas_log_read() doesn't check file flags for O_NONBLOCK and blocks
non-blocking readers of /proc/ppc64/rtas/error_log when there is
no data available. This fixes it.

Also rtas_log_read() returns now with ENODATA to prevent suspending of
process in wait_event_interruptible() when logging facility was
switched off and log is already empty.

Signed-off-by: Vitaly Mayatskikh <v.mayatskih@gmail.com>
Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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