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authorAndreas Herrmann <herrmann.der.user@googlemail.com>2009-11-11 22:03:29 +0300
committerIngo Molnar <mingo@elte.hu>2009-11-11 22:06:54 +0300
commit9f15226e75583547aaf542c6be4bdac1060dd425 (patch)
treeaab312a545d423724195ee662362e72caab28241 /arch/x86/kernel/microcode_amd.c
parent1a74357066369be91e6f4f431621a00b052df964 (diff)
downloadlinux-9f15226e75583547aaf542c6be4bdac1060dd425.tar.xz
x86, ucode-amd: Ensure ucode update on suspend/resume after CPU off/online cycle
When switching a CPU offline/online and then doing suspend/resume, ucode is not updated on this CPU. This is due to the microcode_fini_cpu() call which frees uci->mc when setting the CPU offline: static void microcode_fini_cpu_amd(int cpu) { struct ucode_cpu_info *uci = ucode_cpu_info + cpu; vfree(uci->mc); uci->mc = NULL; } When the CPU is set online uci->mc is still NULL because no ucode update is required. Finally this prevents ucode update when resuming after suspend: static enum ucode_state microcode_resume_cpu(int cpu) { struct ucode_cpu_info *uci = ucode_cpu_info + cpu; if (!uci->mc) return UCODE_NFOUND; ... } Fix is to check whether uci->mc is valid before microcode_resume_cpu() is called. Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com> Cc: dimm <dmitry.adamushko@gmail.com> LKML-Reference: <20091111190329.GF18592@alberich.amd.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/microcode_amd.c')
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