From: James Custer Date: Sun, 2 Nov 2014 18:16:39 +0000 (-0600) Subject: x86: UV BAU: Avoid NULL pointer reference in ptc_seq_show X-Git-Tag: omap-for-v3.19/fixes-rc1~155^3~1 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fa2a79ce6aef5de35a4d50487da35deb6b634944;p=pandora-kernel.git x86: UV BAU: Avoid NULL pointer reference in ptc_seq_show In init_per_cpu(), when get_cpu_topology() fails, init_per_cpu_tunables() is not called afterwards. This means that bau_control->statp is NULL. If a user then reads /proc/sgi_uv/ptc_statistics ptc_seq_show() references a NULL pointer. Therefore, since uv_bau_init calls set_bau_off when init_per_cpu() fails, we add code that detects when the bau is off in ptc_seq_show() to avoid referencing a NULL pointer. Signed-off-by: James Custer Cc: Russ Anderson Link: http://lkml.kernel.org/r/1414952199-185319-2-git-send-email-jcuster@sgi.com Signed-off-by: Thomas Gleixner --- Reading git-diff-tree failed