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PM / devfreq: Fix static checker warning in try_then_request_governor

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[ Upstream commit b53b0128052ffd687797d5f4deeb76327e7b5711 ]

The patch 23c7b54ca1cd: "PM / devfreq: Fix devfreq_add_device() when
drivers are built as modules." leads to the following static checker
warning:

    drivers/devfreq/devfreq.c:1043 governor_store()
    warn: 'governor' can also be NULL

The reason is that the try_then_request_governor() function returns both
error pointers and NULL. It should just return error pointers, so fix
this by returning a ERR_PTR to the error intead of returning NULL.

Fixes: 23c7b54ca1cd ("PM / devfreq: Fix devfreq_add_device() when drivers are built as modules.")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Enric Balletbo i Serra 2019-03-13 13:22:53 +01:00 committed by Greg Kroah-Hartman
parent 903cfafe08
commit 4039b5dd0f
1 changed files with 2 additions and 2 deletions
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4
drivers/devfreq/devfreq.c
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@ -231,7 +231,7 @@ static struct devfreq_governor *find_devfreq_governor(const char *name)
* if is not found. This can happen when both drivers (the governor driver
* and the driver that call devfreq_add_device) are built as modules.
* devfreq_list_lock should be held by the caller. Returns the matched
* governor's pointer.
* governor's pointer or an error pointer.
*/
static struct devfreq_governor *try_then_request_governor(const char *name)
{
@ -257,7 +257,7 @@ static struct devfreq_governor *try_then_request_governor(const char *name)
/* Restore previous state before return */
mutex_lock(&devfreq_list_lock);
if (err)
return NULL;
return ERR_PTR(err);
governor = find_devfreq_governor(name);
}