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| author | Hsin-Yi Wang <hsinyi@chromium.org> | 2022-07-05 20:16:49 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-08-17 16:14:17 +0300 |
| commit | f0762b6a3a40e3c2f551121a37448aa287309efc (patch) | |
| tree | 2e1b29c45a4b8547a7c70bb2b9460d97c8145d10 /drivers/base | |
| parent | f8c44af7dd2d023b9241f5bd530fa3b0778d97cc (diff) | |
| download | linux-f0762b6a3a40e3c2f551121a37448aa287309efc.tar.xz | |
PM: domains: Ensure genpd_debugfs_dir exists before remove
[ Upstream commit 37101d3c719386040ded735a5ec06974f1d94d1f ]
Both genpd_debug_add() and genpd_debug_remove() may be called
indirectly by other drivers while genpd_debugfs_dir is not yet
set. For example, drivers can call pm_genpd_init() in probe or
pm_genpd_init() in probe fail/cleanup path:
pm_genpd_init()
--> genpd_debug_add()
pm_genpd_remove()
--> genpd_remove()
--> genpd_debug_remove()
At this time, genpd_debug_init() may not yet be called.
genpd_debug_add() checks that if genpd_debugfs_dir is NULL, it
will return directly. Make sure this is also checked
in pm_genpd_remove(), otherwise components under debugfs root
which has the same name as other components under pm_genpd may
be accidentally removed, since NULL represents debugfs root.
Fixes: 718072ceb211 ("PM: domains: create debugfs nodes when adding power domains")
Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/base')
| -rw-r--r-- | drivers/base/power/domain.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index 739e52cd4aba..55a10e6d4e2a 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -222,6 +222,9 @@ static void genpd_debug_remove(struct generic_pm_domain *genpd) { struct dentry *d; + if (!genpd_debugfs_dir) + return; + d = debugfs_lookup(genpd->name, genpd_debugfs_dir); debugfs_remove(d); } |