[PATCH 4.4 084/115] arm-ccn: perf: Prevent module unload while PMU is in use

Greg Kroah-Hartman
2017-12-18T17:58:49Z

From: Suzuki K Poulose <suzuki.poulose@arm.com>

[ Upstream commit c7f5828bf77dcbd61d51f4736c1d5aa35663fbb4 ]

When the PMU driver is built as a module, the perf expects the
pmu->module to be valid, so that the driver is prevented from
being unloaded while it is in use. Fix the CCN pmu driver to
fill in this field.

Fixes: a33b0daab73a0 ("bus: ARM CCN PMU driver")
Cc: Pawel Moll <pawel.moll@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/bus/arm-ccn.c | 1 +
1 file changed, 1 insertion(+)

--- a/drivers/bus/arm-ccn.c
+++ b/drivers/bus/arm-ccn.c
@@ -1260,6 +1260,7 @@ static int arm_ccn_pmu_init(struct arm_c

/* Perf driver registration */
ccn->dt.pmu = (struct pmu) {
+ .module = THIS_MODULE,
.attr_groups = arm_ccn_pmu_attr_groups,
.task_ctx_nr = perf_invalid_context,
.event_init = arm_ccn_pmu_event_init,