[PATCH] firmware: arm_scmi: Use dev_err_probe() simplify the code

[Dan Carpenter]

On Thu, May 15, 2025 at 08:38:55PM +0800, long.yunjian at zte.com.cn wrote:
> From: Yumeng Fang <fang.yumeng at zte.com.cn>
> 
> In the probe path, dev_err() can be replaced with dev_err_probe()
> which will check if error code is -EPROBE_DEFER and prints the
> error name. It also sets the defer probe reason which can be
> checked later through debugfs.
> 
> Signed-off-by: Yumeng Fang <fang.yumeng at zte.com.cn>

When you're resending someone else's patch you need to add your own
Signed-off-by: line to the end of the list.

Please, could you resend a v2 patch with your signature?

> ---
>  drivers/firmware/arm_scmi/transports/mailbox.c | 17 +++++++----------
>  1 file changed, 7 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/firmware/arm_scmi/transports/mailbox.c b/drivers/firmware/arm_scmi/transports/mailbox.c
> index bd041c99b92b..816e79537935 100644
> --- a/drivers/firmware/arm_scmi/transports/mailbox.c
> +++ b/drivers/firmware/arm_scmi/transports/mailbox.c
> @@ -13,6 +13,7 @@
>  #include <linux/of_address.h>
>  #include <linux/platform_device.h>
>  #include <linux/slab.h>
> +#include <linux/dev_printk.h>
> 
>  #include "../common.h"
> 
> @@ -215,10 +216,8 @@ static int mailbox_chan_setup(struct scmi_chan_info *cinfo, struct device *dev,
>  	smbox->chan = mbox_request_channel(cl, tx ? 0 : p2a_chan);
>  	if (IS_ERR(smbox->chan)) {
>  		ret = PTR_ERR(smbox->chan);
> -		if (ret != -EPROBE_DEFER)
> -			dev_err(cdev,
> -				"failed to request SCMI %s mailbox\n", desc);
> -		return ret;
> +		return dev_err_probe(cdev, ret,

It's probably better to get rid of the "ret = PTR_ERR(smbox->chan);"
assignment as well.  Then it's a one liner:

  	if (IS_ERR(smbox->chan))
		return dev_err_probe(cdev, PTR_ERR(smbox->chan),
				     "failed to request SCMI %s mailbox\n", desc);

Same for the others as well.

regards,
dan carpenter