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| author |  Qi Liu <liuqi115@huawei.com>
| 2020-07-17 16:49:23 +0800 |
|---|---|---|
| committer |  Will Deacon <will@kernel.org>
| 2020-07-17 10:51:44 +0100 |
| commit | f32ed8eb0e3f0d0ef4ddb854554d60ca5863a9f9 (patch) | |
| tree | 455b30ad8a4efffe84e472e9036fcd319eab0f82 /drivers/perf/qcom_l3_pmu.c | |
| parent | asm-generic/mmiowb: Allow mmiowb_set_pending() when preemptible() (diff) | |
| download | linux-f32ed8eb0e3f0d0ef4ddb854554d60ca5863a9f9.tar.gz linux-f32ed8eb0e3f0d0ef4ddb854554d60ca5863a9f9.tar.bz2 linux-f32ed8eb0e3f0d0ef4ddb854554d60ca5863a9f9.zip | |
drivers/perf: Prevent forced unbinding of PMU drivers
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>
Diffstat (limited to 'drivers/perf/qcom_l3_pmu.c')
| -rw-r--r-- | drivers/perf/qcom_l3_pmu.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/perf/qcom_l3_pmu.c b/drivers/perf/qcom_l3_pmu.c index 656e830798d9..9ddb577c542b 100644 --- a/drivers/perf/qcom_l3_pmu.c +++ b/drivers/perf/qcom_l3_pmu.c @@ -814,6 +814,7 @@ static struct platform_driver qcom_l3_cache_pmu_driver = { .driver = { .name = "qcom-l3cache-pmu", .acpi_match_table = ACPI_PTR(qcom_l3_cache_pmu_acpi_match), + .suppress_bind_attrs = true, }, .probe = qcom_l3_cache_pmu_probe, }; |