From 3d73710880afa3d61cf57b5d4eb192e812eb7e4f Mon Sep 17 00:00:00 2001 From: Jesse Barnes Date: Tue, 28 Jun 2011 10:59:12 -0700 Subject: cpufreq: expose a cpufreq_quick_get_max routine This allows drivers and other code to get the max reported CPU frequency. Initial use is for scaling ring frequency with GPU frequency in the i915 driver. Signed-off-by: Jesse Barnes Signed-off-by: Keith Packard --- drivers/cpufreq/cpufreq.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) (limited to 'drivers/cpufreq') diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 0a5bea9e3585..987a165ede26 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -1199,6 +1199,26 @@ unsigned int cpufreq_quick_get(unsigned int cpu) } EXPORT_SYMBOL(cpufreq_quick_get); +/** + * cpufreq_quick_get_max - get the max reported CPU frequency for this CPU + * @cpu: CPU number + * + * Just return the max possible frequency for a given CPU. + */ +unsigned int cpufreq_quick_get_max(unsigned int cpu) +{ + struct cpufreq_policy *policy = cpufreq_cpu_get(cpu); + unsigned int ret_freq = 0; + + if (policy) { + ret_freq = policy->max; + cpufreq_cpu_put(policy); + } + + return ret_freq; +} +EXPORT_SYMBOL(cpufreq_quick_get_max); + static unsigned int __cpufreq_get(unsigned int cpu) { -- cgit v1.2.3 From e71f5cc402ecb42b407ae52add7b173bf1c53daa Mon Sep 17 00:00:00 2001 From: Naga Chumbalkar Date: Wed, 14 Sep 2011 16:22:23 -0700 Subject: drivers/cpufreq/pcc-cpufreq.c: avoid NULL pointer dereference per_cpu(processors, n) can be NULL, resulting in: Loading CPUFreq modules[ 437.661360] BUG: unable to handle kernel NULL pointer dereference at (null) IP: [] pcc_cpufreq_cpu_init+0x74/0x220 [pcc_cpufreq] It's better to avoid the oops by failing the driver, and allowing the system to boot. Signed-off-by: Naga Chumbalkar Cc: Dave Jones Cc: Len Brown Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/cpufreq/pcc-cpufreq.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'drivers/cpufreq') diff --git a/drivers/cpufreq/pcc-cpufreq.c b/drivers/cpufreq/pcc-cpufreq.c index 7b0603eb0129..cdc02ac8f41a 100644 --- a/drivers/cpufreq/pcc-cpufreq.c +++ b/drivers/cpufreq/pcc-cpufreq.c @@ -261,6 +261,9 @@ static int pcc_get_offset(int cpu) pr = per_cpu(processors, cpu); pcc_cpu_data = per_cpu_ptr(pcc_cpu_info, cpu); + if (!pr) + return -ENODEV; + status = acpi_evaluate_object(pr->handle, "PCCP", NULL, &buffer); if (ACPI_FAILURE(status)) return -ENODEV; -- cgit v1.2.3