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crypto: stm32 - Properly handle pm_runtime_get failing 

[ Upstream commit aec4880516 ]

If pm_runtime_get() (disguised as pm_runtime_resume_and_get()) fails, this
means the clk wasn't prepared and enabled. Returning early in this case
however is wrong as then the following resource frees are skipped and this
is never catched up. So do all the cleanups but clk_disable_unprepare().

Also don't emit a warning, as stm32_hash_runtime_resume() already emitted
one.

Note that the return value of stm32_hash_remove() is mostly ignored by
the device core. The only effect of returning zero instead of an error
value is to suppress another warning in platform_remove(). So return 0
even if pm_runtime_resume_and_get() failed.

Fixes: 8b4d566de6 ("crypto: stm32/hash - Add power management support")
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Uwe Kleine-König 2023-07-31 18:54:54 +02:00 committed by Greg Kroah-Hartman
parent 148eaae092
commit 66ee37d0da
1 changed files with 3 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/crypto/stm32/stm32-hash.c
View File

@ -1705,9 +1705,7 @@ static int stm32_hash_remove(struct platform_device *pdev)
if (!hdev)
return -ENODEV;
ret = pm_runtime_resume_and_get(hdev->dev);
if (ret < 0)
return ret;
ret = pm_runtime_get_sync(hdev->dev);
stm32_hash_unregister_algs(hdev);
@ -1723,7 +1721,8 @@ static int stm32_hash_remove(struct platform_device *pdev)
pm_runtime_disable(hdev->dev);
pm_runtime_put_noidle(hdev->dev);
clk_disable_unprepare(hdev->clk);
if (ret >= 0)
clk_disable_unprepare(hdev->clk);
return 0;
}