diff options
| author | Mark Rutland <mark.rutland@arm.com> | 2017-04-11 09:39:49 +0100 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2017-04-11 16:29:53 +0100 |
| commit | 7654137071fa706e5c91f4f27bc2a5cd7e435a9b (patch) | |
| tree | 95842326f7cc3e1d8262a793ba9a3e2818aaa962 /drivers/perf | |
| parent | 3a5a89d30ee3d5d8b55490e3c63bf533b196e1c8 (diff) | |
| download | linux-next-7654137071fa706e5c91f4f27bc2a5cd7e435a9b.tar.gz | |
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.c | 12 |
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) |