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drivers/perf: Prevent forced unbinding of PMU drivers

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Forcefully unbinding PMU drivers during perf sampling will lead to
a kernel panic, because the perf upper-layer framework call a NULL
pointer in this situation.

To solve this issue, "suppress_bind_attrs" should be set to true, so
that bind/unbind can be disabled via sysfs and prevent unbinding PMU
drivers during perf sampling.

Signed-off-by: Qi Liu <liuqi115@huawei.com>
Reviewed-by: John Garry <john.garry@huawei.com>
Link: https://lore.kernel.org/r/1594975763-32966-1-git-send-email-liuqi115@huawei.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Qi Liu
2020-07-17 16:49:23 +08:00
committed by Will Deacon
parent bd024e82e4
commit f32ed8eb0e
13 changed files with 13 additions and 0 deletions
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1
drivers/perf/fsl_imx8_ddr_perf.c
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@@ -707,6 +707,7 @@ static struct platform_driver imx_ddr_pmu_driver = {
.driver = {
.name = "imx-ddr-pmu",
.of_match_table = imx_ddr_pmu_dt_ids,
.suppress_bind_attrs = true,
},
.probe = ddr_perf_probe,
.remove = ddr_perf_remove,