Re: [PATCH v4] HID: i2c-hid: Fix "(null)" output when reading report descriptor fails

[Mario Limonciello <superm1@kernel.org>]

On 7/16/26 06:29, Ai Chao wrote:
> When i2c-hid fails to read the HID report descriptor during device
> initialization, the error message prints as:
> 
>    hid (null): reading report descriptor failed
> 
> The HID device name is set in hid_add_device() after calling
> hdev->ll_driver->parse(), so when i2c_hid_parse() fails and calls
> hid_err(), the device name has not been set yet, resulting in "(null)"
> output.
> 
> Use dev_err(&client->dev, ...) instead of hid_err(hid, ...) because
> the I2C client device is fully initialized with a proper name, providing
> meaningful error messages for debugging.
> 
> Before: hid (null): reading report descriptor failed
> After:  i2c_hid i2c-TPD0001:00: reading report descriptor failed
> 
> Fixes: 4a200c3b9a40 ("HID: i2c-hid: introduce HID over i2c specification implementation")
> 
> Signed-off-by: Ai Chao <aichao@kylinos.cn>
Reviewed-by: Mario Limonciello (AMD) <superm1@kernel.org>
> ---
> change for v4
> - Add Fixes tag.
> ---
>   drivers/hid/i2c-hid/i2c-hid-core.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/hid/i2c-hid/i2c-hid-core.c b/drivers/hid/i2c-hid/i2c-hid-core.c
> index 3adb16366e93..0e725a0f0abe 100644
> --- a/drivers/hid/i2c-hid/i2c-hid-core.c
> +++ b/drivers/hid/i2c-hid/i2c-hid-core.c
> @@ -792,7 +792,7 @@ static int i2c_hid_parse(struct hid_device *hid)
>   					    ihid->hdesc.wReportDescRegister,
>   					    rdesc, rsize);
>   		if (ret) {
> -			hid_err(hid, "reading report descriptor failed\n");
> +			dev_err(&client->dev, "reading report descriptor failed\n");
>   			goto out;
>   		}
>   	}