From 869e78e31ac0af40522df04315e0e37894cd888c Mon Sep 17 00:00:00 2001 From: Josh Boyer Date: Tue, 18 Feb 2014 08:43:12 -0500 Subject: [PATCH] Fix r8169 ethernet after suspend (rhbz 1054408) --- ...ize-per-cpu-data-structures-properly.patch | 138 ++++++++++++++++++ kernel.spec | 7 + 2 files changed, 145 insertions(+) create mode 100644 cpufreq-powernow-k8-Initialize-per-cpu-data-structures-properly.patch diff --git a/cpufreq-powernow-k8-Initialize-per-cpu-data-structures-properly.patch b/cpufreq-powernow-k8-Initialize-per-cpu-data-structures-properly.patch new file mode 100644 index 000000000..70a553d2c --- /dev/null +++ b/cpufreq-powernow-k8-Initialize-per-cpu-data-structures-properly.patch @@ -0,0 +1,138 @@ +Bugzilla: 1054408 +Upstream-status: Queued for 3.14 and CC'd to stable +Delivered-To: jwboyer@gmail.com +Received: by 10.76.82.162 with SMTP id j2csp112184oay; + Mon, 17 Feb 2014 03:01:52 -0800 (PST) +X-Received: by 10.68.164.4 with SMTP id ym4mr26078759pbb.53.1392634911720; + Mon, 17 Feb 2014 03:01:51 -0800 (PST) +Return-Path: +Received: from vger.kernel.org (vger.kernel.org. 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Bhat" +Subject: [PATCH] cpufreq, + powernow-k8: Initialize per-cpu data-structures properly +To: pierre-list@ossman.eu, rjw@rjwysocki.net +Cc: viresh.kumar@linaro.org, linux-pm@vger.kernel.org, + linux-kernel@vger.kernel.org, + "Srivatsa S. Bhat" +Date: Mon, 17 Feb 2014 16:18:21 +0530 +Message-ID: <20140217104821.21147.71463.stgit@srivatsabhat.in.ibm.com> +User-Agent: StGIT/0.14.3 +MIME-Version: 1.0 +Content-Type: text/plain; charset="utf-8" +Content-Transfer-Encoding: 7bit +X-TM-AS-MML: disable +X-Content-Scanned: Fidelis XPS MAILER +x-cbid: 14021710-9574-0000-0000-00000BFDA307 +Sender: linux-kernel-owner@vger.kernel.org +Precedence: bulk +List-ID: +X-Mailing-List: linux-kernel@vger.kernel.org + +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. + +https://bugzilla.kernel.org/show_bug.cgi?id=70311 + +Fix this by initializing the per-cpu data-structures of _all_ the CPUs +in the policy appropriately. + +Cc: stable@vger.kernel.org +Reported-by: Pierre Ossman +Signed-off-by: Srivatsa S. Bhat +--- + + drivers/cpufreq/powernow-k8.c | 10 +++++++--- + 1 file changed, 7 insertions(+), 3 deletions(-) + +diff --git a/drivers/cpufreq/powernow-k8.c b/drivers/cpufreq/powernow-k8.c +index e10b646..6684e03 100644 +--- a/drivers/cpufreq/powernow-k8.c ++++ b/drivers/cpufreq/powernow-k8.c +@@ -1076,7 +1076,7 @@ static int powernowk8_cpu_init(struct cpufreq_policy *pol) + { + struct powernow_k8_data *data; + struct init_on_cpu init_on_cpu; +- int rc; ++ int rc, cpu; + + smp_call_function_single(pol->cpu, check_supported_cpu, &rc, 1); + if (rc) +@@ -1140,7 +1140,9 @@ static int powernowk8_cpu_init(struct cpufreq_policy *pol) + pr_debug("cpu_init done, current fid 0x%x, vid 0x%x\n", + data->currfid, data->currvid); + +- per_cpu(powernow_data, pol->cpu) = data; ++ /* Point all the CPUs in this policy to the same data */ ++ for_each_cpu(cpu, pol->cpus) ++ per_cpu(powernow_data, cpu) = data; + + return 0; + +@@ -1155,6 +1157,7 @@ err_out: + static int powernowk8_cpu_exit(struct cpufreq_policy *pol) + { + struct powernow_k8_data *data = per_cpu(powernow_data, pol->cpu); ++ int cpu; + + if (!data) + return -EINVAL; +@@ -1165,7 +1168,8 @@ static int powernowk8_cpu_exit(struct cpufreq_policy *pol) + + kfree(data->powernow_table); + kfree(data); +- per_cpu(powernow_data, pol->cpu) = NULL; ++ for_each_cpu(cpu, pol->cpus) ++ per_cpu(powernow_data, cpu) = NULL; + + return 0; + } + +-- +To unsubscribe from this list: send the line "unsubscribe linux-kernel" in +the body of a message to majordomo@vger.kernel.org +More majordomo info at http://vger.kernel.org/majordomo-info.html +Please read the FAQ at http://www.tux.org/lkml/ diff --git a/kernel.spec b/kernel.spec index a6f122987..4b6e4ba66 100644 --- a/kernel.spec +++ b/kernel.spec @@ -628,6 +628,9 @@ Patch25201: cifs-sanity-check-length-of-data-to-send-before-sending.patch #rhbz 1062833 Patch25202: dma-debug-account-for-cachelines-and-read-only-mappings.patch +#rhbz 1054408 +Patch25203: cpufreq-powernow-k8-Initialize-per-cpu-data-structures-properly.patch + # END OF PATCH DEFINITIONS %endif @@ -1278,6 +1281,9 @@ ApplyPatch cifs-sanity-check-length-of-data-to-send-before-sending.patch #rhbz 1062833 ApplyPatch dma-debug-account-for-cachelines-and-read-only-mappings.patch +#rhbz 1054408 +ApplyPatch cpufreq-powernow-k8-Initialize-per-cpu-data-structures-properly.patch + # END OF PATCH APPLICATIONS @@ -2061,6 +2067,7 @@ fi * Tue Feb 18 2014 Josh Boyer - 3.14.0-0.rc3.git1.1 - Linux v3.14-rc3-20-g60f76ea - Reenable debugging options. +- Fix r8169 ethernet after suspend (rhbz 1054408) * Mon Feb 17 2014 Josh Boyer - 3.14.0-0.rc3.git0.1 - Linux v3.14-rc3