Re: [PATCH v2] staging: greybus: replace PTR_ERR() with %pe in error messages

[Alex Elder]

On 10/12/26 9:24 PM, pavankumaryalagada@xxxxxxxxx wrote:
> From: Yalagada Pavan Kumar <pavankumaryalagada@xxxxxxxxx>
>
> Use %pe to print error pointers directly and display their
> error names.
>
> Keep the other PTR_ERR() call because its return value is
> needed for ret.
>
> Signed-off-by: Yalagada Pavan Kumar <pavankumaryalagada@xxxxxxxxx>


Generally I think what you're doing is OK.  It looks
like %pe is better than just %d, because it prints
the error *name* for the pointer-coded error.

But I have two general questions about this effort:

- There are other places in the Greybus code (even in
  just the staging source files) where this exact same
  thing could be done.  Why limit this to "fw-core.c" only?

- Do you think that all Greybus error messages should be
  converted to use %pe (passing ERR_PTR() if necessary)
  instead of %d for showing the error number?

I think your suggested change is a net positive, but
doing it in some spots but not others means it is
adding a bit of inconsistency.

					-Alex

> ---
> v2:
> - Use %pe in the firmware management case, as suggested by Jeremy Clifton,
>    to match the other cases.
>
> v1: https://lore.kernel.org/outreachy/as0nhVbagZa8Birm@user/T/#t
> ---
>   drivers/staging/greybus/fw-core.c | 16 ++++++++--------
>   1 file changed, 8 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/staging/greybus/fw-core.c b/drivers/staging/greybus/fw-core.c
> index 2016a74f137f..78321be80013 100644
> --- a/drivers/staging/greybus/fw-core.c
> +++ b/drivers/staging/greybus/fw-core.c
> @@ -93,8 +93,8 @@ static int gb_fw_core_probe(struct gb_bundle *bundle,
>   			if (IS_ERR(connection)) {
>   				ret = PTR_ERR(connection);
>   				dev_err(&bundle->dev,
> -					"failed to create management connection (%d)\n",
> -					ret);
> +					"failed to create management connection (%pe)\n",
> +					connection);
>   				goto err_destroy_connections;
>   			}
>   
> @@ -112,8 +112,8 @@ static int gb_fw_core_probe(struct gb_bundle *bundle,
>   			connection = gb_connection_create(bundle, cport_id,
>   							  gb_fw_download_request_handler);
>   			if (IS_ERR(connection)) {
> -				dev_err(&bundle->dev, "failed to create download connection (%ld)\n",
> -					PTR_ERR(connection));
> +				dev_err(&bundle->dev, "failed to create download connection (%pe)\n",
> +					connection);
>   			} else {
>   				fw_core->download_connection = connection;
>   			}
> @@ -131,8 +131,8 @@ static int gb_fw_core_probe(struct gb_bundle *bundle,
>   			connection = gb_connection_create(bundle, cport_id,
>   							  NULL);
>   			if (IS_ERR(connection)) {
> -				dev_err(&bundle->dev, "failed to create SPI connection (%ld)\n",
> -					PTR_ERR(connection));
> +				dev_err(&bundle->dev, "failed to create SPI connection (%pe)\n",
> +					connection);
>   			} else {
>   				fw_core->spi_connection = connection;
>   			}
> @@ -149,8 +149,8 @@ static int gb_fw_core_probe(struct gb_bundle *bundle,
>   			connection = gb_connection_create(bundle, cport_id,
>   							  NULL);
>   			if (IS_ERR(connection)) {
> -				dev_err(&bundle->dev, "failed to create Authentication connection (%ld)\n",
> -					PTR_ERR(connection));
> +				dev_err(&bundle->dev, "failed to create Authentication connection (%pe)\n",
> +					connection);
>   			} else {
>   				fw_core->cap_connection = connection;
>   			}