Commit 76541370 authored by Mark Rutland's avatar Mark Rutland Committed by Will Deacon

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: default avatarMark Rutland <mark.rutland@arm.com>
Tested-by: default avatarJeremy Linton <jeremy.linton@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent 3a5a89d3
......@@ -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)
......
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