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SubjectRe: [PATCH 07/15] Platform: OLPC: Avoid a warning if the EC didn't register yet
On Wed, Oct 10, 2018 at 8:23 PM Lubomir Rintel <lkundrak@v3.sk> wrote:
>
> Just return ENODEV, so that whoever attempted to use the EC call can
> defer their work.
>
> Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
> ---
> drivers/platform/olpc/olpc-ec.c | 7 +++++--
> 1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/platform/olpc/olpc-ec.c b/drivers/platform/olpc/olpc-ec.c
> index 35a21c66cd0d..342f5bb7f7a8 100644
> --- a/drivers/platform/olpc/olpc-ec.c
> +++ b/drivers/platform/olpc/olpc-ec.c
> @@ -116,8 +116,11 @@ int olpc_ec_cmd(u8 cmd, u8 *inbuf, size_t inlen, u8 *outbuf, size_t outlen)
> struct olpc_ec_priv *ec = ec_priv;
> struct ec_cmd_desc desc;
>
> - /* Ensure a driver and ec hook have been registered */
> - if (WARN_ON(!ec_driver || !ec_driver->ec_cmd))
> + /* Driver not yet registered. */
> + if (!ec_driver)
> + return -ENODEV;

Why -ENODEV is preferred over -EPROBE_DEFER?

> +
> + if (WARN_ON(!ec_driver->ec_cmd))
> return -ENODEV;
>
> if (!ec)
> --
> 2.19.0
>


--
With Best Regards,
Andy Shevchenko

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