linux-kernel - [PATCH] ALSA: USB-MIDI: Use common error handling code in __snd_usbmidi

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Date:   Wed, 23 Aug 2017 12:25:50 +0200
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     alsa-devel@...a-project.org, Clemens Ladisch <clemens@...isch.de>,
        Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: [PATCH] ALSA: USB-MIDI: Use common error handling code in
 __snd_usbmidi_create()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Wed, 23 Aug 2017 12:20:07 +0200

Add jump targets so that a bit of exception handling can be better reused
at the end of this function.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 sound/usb/midi.c | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/sound/usb/midi.c b/sound/usb/midi.c
index a35f41467237..bd9d02268724 100644
--- a/sound/usb/midi.c
+++ b/sound/usb/midi.c
@@ -2435,10 +2435,8 @@ int __snd_usbmidi_create(struct snd_card *card,
 		err = -ENXIO;
 		break;
 	}
-	if (err < 0) {
-		kfree(umidi);
-		return err;
-	}
+	if (err < 0)
+		goto free_midi;
 
 	/* create rawmidi device */
 	out_ports = 0;
@@ -2448,23 +2446,25 @@ int __snd_usbmidi_create(struct snd_card *card,
 		in_ports += hweight16(endpoints[i].in_cables);
 	}
 	err = snd_usbmidi_create_rawmidi(umidi, out_ports, in_ports);
-	if (err < 0) {
-		kfree(umidi);
-		return err;
-	}
+	if (err < 0)
+		goto free_midi;
 
 	/* create endpoint/port structures */
 	if (quirk && quirk->type == QUIRK_MIDI_MIDIMAN)
 		err = snd_usbmidi_create_endpoints_midiman(umidi, &endpoints[0]);
 	else
 		err = snd_usbmidi_create_endpoints(umidi, endpoints);
-	if (err < 0) {
-		return err;
-	}
+	if (err < 0)
+		goto exit;
 
 	usb_autopm_get_interface_no_resume(umidi->iface);
 
 	list_add_tail(&umidi->list, midi_list);
 	return 0;
+
+free_midi:
+	kfree(umidi);
+exit:
+	return err;
 }
 EXPORT_SYMBOL(__snd_usbmidi_create);
-- 
2.14.0