From mboxrd@z Thu Jan 1 00:00:00 1970 From: rnayak@ti.com (Rajendra Nayak) Date: Thu, 9 Aug 2012 12:38:21 +0530 Subject: [PATCH v2 1/2] cpufreq: OMAP: Handle missing frequency table on SMP systems In-Reply-To: <1344496102-24451-1-git-send-email-rnayak@ti.com> References: <1344496102-24451-1-git-send-email-rnayak@ti.com> Message-ID: <1344496102-24451-2-git-send-email-rnayak@ti.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On OMAP4, if the first CPU fails to get a valid frequency table (this could happen if the platform does not register any OPP table), the subsequent CPU instances end up dealing with a NULL freq_table and crash. Check for an already existing freq_table, before trying to create one, and increment the freq_table_users only if the table is sucessfully created. Signed-off-by: Rajendra Nayak Signed-off-by: Santosh Shilimkar Cc: --- drivers/cpufreq/omap-cpufreq.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/cpufreq/omap-cpufreq.c b/drivers/cpufreq/omap-cpufreq.c index 17fa04d..b47034e 100644 --- a/drivers/cpufreq/omap-cpufreq.c +++ b/drivers/cpufreq/omap-cpufreq.c @@ -218,7 +218,7 @@ static int __cpuinit omap_cpu_init(struct cpufreq_policy *policy) policy->cur = policy->min = policy->max = omap_getspeed(policy->cpu); - if (atomic_inc_return(&freq_table_users) == 1) + if (!freq_table) result = opp_init_cpufreq_table(mpu_dev, &freq_table); if (result) { @@ -227,6 +227,8 @@ static int __cpuinit omap_cpu_init(struct cpufreq_policy *policy) goto fail_ck; } + atomic_inc_return(&freq_table_users); + result = cpufreq_frequency_table_cpuinfo(policy, freq_table); if (result) goto fail_table; -- 1.7.9.5