From: Aaro Koskinen Date: Tue, 22 Jul 2014 11:51:08 +0000 (+0300) Subject: MIPS: OCTEON: make get_system_type() thread-safe X-Git-Tag: fixes-for-v3.18-merge-window~106^2~12 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=33d9a530d4a87c5d645cfc82f23108ca8d89aa78;p=pandora-kernel.git MIPS: OCTEON: make get_system_type() thread-safe get_system_type() is not thread-safe on OCTEON. It uses static data, also more dangerous issue is that it's calling cvmx_fuse_read_byte() every time without any synchronization. Currently it's possible to get processes stuck looping forever in kernel simply by launching multiple readers of /proc/cpuinfo: (while true; do cat /proc/cpuinfo > /dev/null; done) & (while true; do cat /proc/cpuinfo > /dev/null; done) & ... Fix by initializing the system type string only once during the early boot. Signed-off-by: Aaro Koskinen Cc: stable@vger.kernel.org Reviewed-by: Markos Chandras Patchwork: http://patchwork.linux-mips.org/patch/7437/ Signed-off-by: James Hogan --- Reading git-diff-tree failed