Fix r8169 ethernet after suspend (rhbz 1054408)
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Josh Boyer
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Bugzilla: 1054408
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Upstream-status: Queued for 3.14 and CC'd to stable
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Mon, 17 Feb 2014 16:23:45 +0530
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From: "Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>
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Subject: [PATCH] cpufreq,
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powernow-k8: Initialize per-cpu data-structures properly
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To: pierre-list@ossman.eu, rjw@rjwysocki.net
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Cc: viresh.kumar@linaro.org, linux-pm@vger.kernel.org,
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linux-kernel@vger.kernel.org,
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"Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>
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Date: Mon, 17 Feb 2014 16:18:21 +0530
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The powernow-k8 driver maintains a per-cpu data-structure called powernow_data
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that is used to perform the frequency transitions. It initializes this data-
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structure only for the policy->cpu. So, accesses to this data-structure by
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other CPUs results in various problems because they would have been
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uninitialized.
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Specifically, if a cpu (!= policy->cpu) invokes the drivers' ->get() function,
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it returns 0 as the KHz value, since its per-cpu memory doesn't point to
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anything valid. This causes problems during suspend/resume since
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cpufreq_update_policy() tries to enforce this (0 KHz) as the current frequency
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of the CPU, and this madness gets propagated to adjust_jiffies() as well.
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Eventually, lots of things start breaking down, including the r8169 ethernet
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card, in one particularly interesting case reported by Pierre Ossman.
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https://bugzilla.kernel.org/show_bug.cgi?id=70311
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Fix this by initializing the per-cpu data-structures of _all_ the CPUs
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in the policy appropriately.
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Cc: stable@vger.kernel.org
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Reported-by: Pierre Ossman <pierre@ossman.eu>
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Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
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---
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drivers/cpufreq/powernow-k8.c | 10 +++++++---
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1 file changed, 7 insertions(+), 3 deletions(-)
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diff --git a/drivers/cpufreq/powernow-k8.c b/drivers/cpufreq/powernow-k8.c
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index e10b646..6684e03 100644
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--- a/drivers/cpufreq/powernow-k8.c
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+++ b/drivers/cpufreq/powernow-k8.c
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@@ -1076,7 +1076,7 @@ static int powernowk8_cpu_init(struct cpufreq_policy *pol)
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{
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struct powernow_k8_data *data;
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struct init_on_cpu init_on_cpu;
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- int rc;
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+ int rc, cpu;
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smp_call_function_single(pol->cpu, check_supported_cpu, &rc, 1);
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if (rc)
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@@ -1140,7 +1140,9 @@ static int powernowk8_cpu_init(struct cpufreq_policy *pol)
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pr_debug("cpu_init done, current fid 0x%x, vid 0x%x\n",
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data->currfid, data->currvid);
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- per_cpu(powernow_data, pol->cpu) = data;
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+ /* Point all the CPUs in this policy to the same data */
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+ for_each_cpu(cpu, pol->cpus)
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+ per_cpu(powernow_data, cpu) = data;
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return 0;
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@@ -1155,6 +1157,7 @@ err_out:
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static int powernowk8_cpu_exit(struct cpufreq_policy *pol)
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{
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struct powernow_k8_data *data = per_cpu(powernow_data, pol->cpu);
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+ int cpu;
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if (!data)
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return -EINVAL;
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@@ -1165,7 +1168,8 @@ static int powernowk8_cpu_exit(struct cpufreq_policy *pol)
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kfree(data->powernow_table);
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kfree(data);
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- per_cpu(powernow_data, pol->cpu) = NULL;
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+ for_each_cpu(cpu, pol->cpus)
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+ per_cpu(powernow_data, cpu) = NULL;
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return 0;
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}
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--
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@ -628,6 +628,9 @@ Patch25201: cifs-sanity-check-length-of-data-to-send-before-sending.patch
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#rhbz 1062833
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Patch25202: dma-debug-account-for-cachelines-and-read-only-mappings.patch
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#rhbz 1054408
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Patch25203: cpufreq-powernow-k8-Initialize-per-cpu-data-structures-properly.patch
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# END OF PATCH DEFINITIONS
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%endif
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@ -1278,6 +1281,9 @@ ApplyPatch cifs-sanity-check-length-of-data-to-send-before-sending.patch
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#rhbz 1062833
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ApplyPatch dma-debug-account-for-cachelines-and-read-only-mappings.patch
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#rhbz 1054408
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ApplyPatch cpufreq-powernow-k8-Initialize-per-cpu-data-structures-properly.patch
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# END OF PATCH APPLICATIONS
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@ -2061,6 +2067,7 @@ fi
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* Tue Feb 18 2014 Josh Boyer <jwboyer@fedoraproject.org> - 3.14.0-0.rc3.git1.1
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- Linux v3.14-rc3-20-g60f76ea
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- Reenable debugging options.
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- Fix r8169 ethernet after suspend (rhbz 1054408)
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* Mon Feb 17 2014 Josh Boyer <jwboyer@fedoraproject.org> - 3.14.0-0.rc3.git0.1
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- Linux v3.14-rc3
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