linux-kernel - [PATCH 3.18 51/69] arm-ccn: perf: Prevent module unload while PMU is in use

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Message-Id: <20171218152745.769075827@linuxfoundation.org>
Date:   Mon, 18 Dec 2017 16:48:37 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Pawel Moll <pawel.moll@....com>,
        Will Deacon <will.deacon@....com>,
        Mark Rutland <mark.rutland@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 3.18 51/69] arm-ccn: perf: Prevent module unload while PMU is in use

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/bus/arm-ccn.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/bus/arm-ccn.c
+++ b/drivers/bus/arm-ccn.c
@@ -1157,6 +1157,7 @@ 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,