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

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Date:   Wed,  6 Nov 2019 22:37:45 -0300
From:   "Daniel W. S. Almeida" <dwlsalmeida@...il.com>
To:     mchehab@...nel.org, gregkh@...uxfoundation.org,
        rfontana@...hat.com, kstewart@...uxfoundation.org,
        tglx@...utronix.de
Cc:     "Daniel W. S. Almeida" <dwlsalmeida@...il.com>,
        skhan@...uxfoundation.org,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] media: dvb_dummy_fe: Add error messages in case of attach failure

From: "Daniel W. S. Almeida" <dwlsalmeida@...il.com>

Complain if the attach functions fail, for any reason. This is helpful
when debugging.

Suggested-by: Shuah Khan <skhan@...uxfoundation.org>
Signed-off-by: Daniel W. S. Almeida <dwlsalmeida@...il.com>
---
 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 = {
-- 
2.24.0