redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

PM: runtime: clk: Fix clk_pm_runtime_get() error path 

commit 64c7d7ea22 upstream.

clk_pm_runtime_get() assumes that the PM-runtime usage counter will
be dropped by pm_runtime_get_sync() on errors, which is not the case,
so PM-runtime references to devices acquired by the former are leaked
on errors returned by the latter.

Fix this by modifying clk_pm_runtime_get() to drop the reference if
pm_runtime_get_sync() returns an error.

Fixes: 9a34b45397 clk: Add support for runtime PM
Cc: 4.15+ <stable@vger.kernel.org> # 4.15+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
5.4-rM2-2.2.x-imx-squashed
Rafael J. Wysocki 2020-05-21 19:08:09 +02:00 committed by Greg Kroah-Hartman
parent fc45cd292c
commit 6ed11984ed
1 changed files with 5 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/clk/clk.c
View File

@ -114,7 +114,11 @@ static int clk_pm_runtime_get(struct clk_core *core)
return 0;
ret = pm_runtime_get_sync(core->dev);
return ret < 0 ? ret : 0;
if (ret < 0) {
pm_runtime_put_noidle(core->dev);
return ret;
}
return 0;
}
static void clk_pm_runtime_put(struct clk_core *core)