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media: staging/imx: remove confusing IS_ERR_OR_NULL usage

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While looking at a compiler warning, I noticed the use of
IS_ERR_OR_NULL, which is generally a sign of a bad API design
and should be avoided.

In this driver, this is fairly easy, we can simply stop storing
error pointers in persistent structures, and change the two
functions that might return either a NULL pointer or an error
code to consistently return error pointers when failing.

of_parse_subdev() now separates the error code and the pointer
it looks up, to clarify the interface. There are two cases
where this function originally returns 'NULL', and I have
changed that to '0' for success to keep the current behavior,
though returning an error would also make sense there.

Fixes: e130291212 ("[media] media: Add i.MX media core driver")

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Tested-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Steve Longerbeam <steve_longerbeam@mentor.com>
Tested-by: Steve Longerbeam <steve_longerbeam@mentor.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Arnd Bergmann 2017-07-11 09:18:35 -04:00 • committed by Mauro Carvalho Chehab
commit 0b2e9e7947
5 changed files with 90 additions and 72 deletions
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