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authorMark Rutland <mark.rutland@arm.com>2017-04-11 11:39:49 +0300
committerWill Deacon <will.deacon@arm.com>2017-04-11 18:29:53 +0300
commit7654137071fa706e5c91f4f27bc2a5cd7e435a9b (patch)
tree95842326f7cc3e1d8262a793ba9a3e2818aaa962 /drivers/perf
parent3a5a89d30ee3d5d8b55490e3c63bf533b196e1c8 (diff)
downloadlinux-7654137071fa706e5c91f4f27bc2a5cd7e435a9b.tar.xz
drivers/perf: arm_pmu: handle no platform_device
In armpmu_dispatch_irq() we look at arm_pmu::plat_device to acquire platdata, so that we can defer to platform-specific IRQ handling, required on some 32-bit parts. With the advent of ACPI we won't always have a platform_device, and so we must avoid trying to dereference fields from it. This patch fixes up armpmu_dispatch_irq() to avoid doing so, introducing a new armpmu_get_platdata() helper. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Tested-by: Jeremy Linton <jeremy.linton@arm.com> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'drivers/perf')
-rw-r--r--drivers/perf/arm_pmu.c12
1 files changed, 9 insertions, 3 deletions
diff --git a/drivers/perf/arm_pmu.c b/drivers/perf/arm_pmu.c
index 183c6fd786b2..2442038b3ab5 100644
--- a/drivers/perf/arm_pmu.c
+++ b/drivers/perf/arm_pmu.c
@@ -316,10 +316,16 @@ validate_group(struct perf_event *event)
return 0;
}
+static struct arm_pmu_platdata *armpmu_get_platdata(struct arm_pmu *armpmu)
+{
+ struct platform_device *pdev = armpmu->plat_device;
+
+ return pdev ? dev_get_platdata(&pdev->dev) : NULL;
+}
+
static irqreturn_t armpmu_dispatch_irq(int irq, void *dev)
{
struct arm_pmu *armpmu;
- struct platform_device *plat_device;
struct arm_pmu_platdata *plat;
int ret;
u64 start_clock, finish_clock;
@@ -331,8 +337,8 @@ static irqreturn_t armpmu_dispatch_irq(int irq, void *dev)
* dereference.
*/
armpmu = *(void **)dev;
- plat_device = armpmu->plat_device;
- plat = dev_get_platdata(&plat_device->dev);
+
+ plat = armpmu_get_platdata(armpmu);
start_clock = sched_clock();
if (plat && plat->handle_irq)