From 7654137071fa706e5c91f4f27bc2a5cd7e435a9b Mon Sep 17 00:00:00 2001 From: Mark Rutland Date: Tue, 11 Apr 2017 09:39:49 +0100 Subject: [PATCH] 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 Tested-by: Jeremy Linton Cc: Will Deacon Signed-off-by: Will Deacon --- drivers/perf/arm_pmu.c | 12 +++++++++--- 1 file 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)