linux-kernel - [PATCH AUTOSEL for 4.9 110/156] arm-ccn: perf: Prevent module unload while PMU is in use

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Date:   Thu, 7 Dec 2017 15:49:22 +0000
From:   alexander.levin@...izon.com
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Cc:     Suzuki K Poulose <suzuki.poulose@....com>,
        Pawel Moll <pawel.moll@....com>,
        Will Deacon <will.deacon@....com>, alexander.levin@...izon.com
Subject: [PATCH AUTOSEL for 4.9 110/156] arm-ccn: perf: Prevent module unload
 while PMU is in use

From: Suzuki K Poulose <suzuki.poulose@....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@....com>
Cc: Will Deacon <will.deacon@....com>
Acked-by: Mark Rutland <mark.rutland@....com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
Signed-off-by: Will Deacon <will.deacon@....com>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
---
 drivers/bus/arm-ccn.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/bus/arm-ccn.c b/drivers/bus/arm-ccn.c
index aee83462b796..7f70f29dc5d0 100644
--- a/drivers/bus/arm-ccn.c
+++ b/drivers/bus/arm-ccn.c
@@ -1276,6 +1276,7 @@ static int arm_ccn_pmu_init(struct arm_ccn *ccn)
 
 	/* 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,
-- 
2.11.0