https://github.com/torvalds/linux
The powernow-k8 driver maintains a per-cpu data-structure called powernow_data that is used to perform the frequency transitions. It initializes this data structure only for the policy->cpu. So, accesses to this data structure by other CPUs results in various problems because they would have been uninitialized. Specifically, if a cpu (!= policy->cpu) invokes the drivers' ->get() function, it returns 0 as the KHz value, since its per-cpu memory doesn't point to anything valid. This causes problems during suspend/resume since cpufreq_update_policy() tries to enforce this (0 KHz) as the current frequency of the CPU, and this madness gets propagated to adjust_jiffies() as well. Eventually, lots of things start breaking down, including the r8169 ethernet card, in one particularly interesting case reported by Pierre Ossman. Fix this by initializing the per-cpu data-structures of all the CPUs in the policy appropriately. References: https://bugzilla.kernel.org/show_bug.cgi?id=70311 Reported-by: Pierre Ossman <pierre@ossman.eu> Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> Cc: All applicable <stable@vger.kernel.org> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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cpufreq: powernow-k8: Initialize per-cpu data-structures properly
File | Mode | Size |
---|---|---|
.gitignore | -rw-r--r-- | 151 bytes |
Kconfig | -rw-r--r-- | 5.6 KB |
Makefile | -rw-r--r-- | 2.3 KB |
gen_init_cpio.c | -rw-r--r-- | 12.7 KB |
initramfs_data.S | -rw-r--r-- | 1.3 KB |
Computing file changes ...