[Linux-kernel-mentees] [PATCH] media: dvb_dummy_fe: Add error messages in case of attach failure

[Mauro Carvalho Chehab]

Em Wed,  6 Nov 2019 22:37:45 -0300
"Daniel W. S. Almeida" <dwlsalmeida at gmail.com> escreveu:

> From: "Daniel W. S. Almeida" <dwlsalmeida at gmail.com>
> 
> Complain if the attach functions fail, for any reason. This is helpful
> when debugging.
> 
> Suggested-by: Shuah Khan <skhan at linuxfoundation.org>
> Signed-off-by: Daniel W. S. Almeida <dwlsalmeida at gmail.com>

Looks OK to me.

> ---
>  drivers/media/dvb-frontends/dvb_dummy_fe.c | 18 +++++++++++++++---
>  1 file changed, 15 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/media/dvb-frontends/dvb_dummy_fe.c b/drivers/media/dvb-frontends/dvb_dummy_fe.c
> index 4db679cb70ad..ca86857c3667 100644
> --- a/drivers/media/dvb-frontends/dvb_dummy_fe.c
> +++ b/drivers/media/dvb-frontends/dvb_dummy_fe.c
> @@ -114,12 +114,16 @@ struct dvb_frontend* dvb_dummy_fe_ofdm_attach(void)
>  	/* allocate memory for the internal state */
>  	state = kzalloc(sizeof(struct dvb_dummy_fe_state), GFP_KERNEL);
>  	if (!state)
> -		return NULL;
> +		goto err;
>  
>  	/* create dvb_frontend */
>  	memcpy(&state->frontend.ops, &dvb_dummy_fe_ofdm_ops, sizeof(struct dvb_frontend_ops));
>  	state->frontend.demodulator_priv = state;
>  	return &state->frontend;
> +
> +err:
> +	pr_err("%s: DVB Dummy frontend driver attach failed\n", __func__);
> +	return NULL;
>  }
>  
>  static const struct dvb_frontend_ops dvb_dummy_fe_qpsk_ops;
> @@ -131,12 +135,16 @@ struct dvb_frontend *dvb_dummy_fe_qpsk_attach(void)
>  	/* allocate memory for the internal state */
>  	state = kzalloc(sizeof(struct dvb_dummy_fe_state), GFP_KERNEL);
>  	if (!state)
> -		return NULL;
> +		goto err;
>  
>  	/* create dvb_frontend */
>  	memcpy(&state->frontend.ops, &dvb_dummy_fe_qpsk_ops, sizeof(struct dvb_frontend_ops));
>  	state->frontend.demodulator_priv = state;
>  	return &state->frontend;
> +
> +err:
> +	pr_err("%s: DVB Dummy frontend driver attach failed\n", __func__);
> +	return NULL;
>  }
>  
>  static const struct dvb_frontend_ops dvb_dummy_fe_qam_ops;
> @@ -148,12 +156,16 @@ struct dvb_frontend *dvb_dummy_fe_qam_attach(void)
>  	/* allocate memory for the internal state */
>  	state = kzalloc(sizeof(struct dvb_dummy_fe_state), GFP_KERNEL);
>  	if (!state)
> -		return NULL;
> +		goto err;
>  
>  	/* create dvb_frontend */
>  	memcpy(&state->frontend.ops, &dvb_dummy_fe_qam_ops, sizeof(struct dvb_frontend_ops));
>  	state->frontend.demodulator_priv = state;
>  	return &state->frontend;
> +
> +err:
> +	pr_err("%s: DVB Dummy frontend driver attach failed\n", __func__);
> +	return NULL;
>  }
>  
>  static const struct dvb_frontend_ops dvb_dummy_fe_ofdm_ops = {



Cheers,
Mauro