Re: [PATCH v3 16/23] platform/chrome: cros_ec_proto: return 0 on getting cmd mask success

[Tzung-Bi Shih <tzungbi@kernel.org>]

On Wed, Jun 08, 2022 at 09:20:29AM -0700, Guenter Roeck wrote:
> On Wed, Jun 8, 2022 at 4:08 AM Tzung-Bi Shih <tzungbi@kernel.org> wrote:
> >
> > cros_ec_get_host_command_version_mask() used to return value from
> > send_command() which is number of available bytes for input payload on
> > success (i.e. sizeof(struct ec_response_get_cmd_versions)).
> >
> > However, the callers don't need to know how many bytes are available.
> >
> > Don't return number of available bytes.  Instead, return 0 on success;
> > otherwise, negative integers on error.
> >
> > Also remove the unneeded `ver_mask` initialization as the callers should
> > take it only if cros_ec_get_host_command_version_mask() returns 0.
> 
> Make sure this compiles with W=1. Compilers may think that ver_mask
> may be uninitialized when used.

If I tested it correctly, it compiles.

$ make mrproper
$ make allmodconfig
$ make W=1 drivers/platform/chrome/
...
  CC      drivers/platform/chrome/cros_ec_proto.o
  CC      drivers/platform/chrome/cros_ec_trace.o
  AR      drivers/platform/chrome/built-in.a
  CC [M]  drivers/platform/chrome/chromeos_acpi.o
  CC [M]  drivers/platform/chrome/chromeos_laptop.o
  CC [M]  drivers/platform/chrome/chromeos_privacy_screen.o
  CC [M]  drivers/platform/chrome/chromeos_pstore.o
  CC [M]  drivers/platform/chrome/chromeos_tbmc.o
  CC [M]  drivers/platform/chrome/cros_ec.o
...