linux-kernel - [PATCH 09/11] media: ttusb-dec: cleanup an error handling logic

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Date:   Wed, 16 Jun 2021 14:28:35 +0200
From:   Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
To:     unlisted-recipients:; (no To-header on input)
Cc:     linuxarm@...wei.com, mauro.chehab@...wei.com,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Allen Pais <allen.lkml@...il.com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Romain Perier <romain.perier@...il.com>,
        dingsenjie <dingsenjie@...ong.com>, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org
Subject: [PATCH 09/11] media: ttusb-dec: cleanup an error handling logic

Simplify the logic at ttusb_dec_send_command().

Besides avoiding some code duplication, as a side effect,
this could remove this false positive return with spatch:

	drivers/media/usb/ttusb-dec/ttusb_dec.c:380 ttusb_dec_send_command() warn: inconsistent returns '&dec->usb_mutex'.
	  Locked on  : 330
	  Unlocked on: 354,365,380

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
---
 drivers/media/usb/ttusb-dec/ttusb_dec.c | 25 +++++++++++--------------
 1 file changed, 11 insertions(+), 14 deletions(-)

diff --git a/drivers/media/usb/ttusb-dec/ttusb_dec.c b/drivers/media/usb/ttusb-dec/ttusb_dec.c
index a852ee5f7ac9..bfda46a36dc5 100644
--- a/drivers/media/usb/ttusb-dec/ttusb_dec.c
+++ b/drivers/media/usb/ttusb-dec/ttusb_dec.c
@@ -324,10 +324,10 @@ static int ttusb_dec_send_command(struct ttusb_dec *dec, const u8 command,
 	if (!b)
 		return -ENOMEM;
 
-	if ((result = mutex_lock_interruptible(&dec->usb_mutex))) {
-		kfree(b);
+	result = mutex_lock_interruptible(&dec->usb_mutex);
+	if (result) {
 		printk("%s: Failed to lock usb mutex.\n", __func__);
-		return result;
+		goto err;
 	}
 
 	b[0] = 0xaa;
@@ -349,9 +349,7 @@ static int ttusb_dec_send_command(struct ttusb_dec *dec, const u8 command,
 	if (result) {
 		printk("%s: command bulk message failed: error %d\n",
 		       __func__, result);
-		mutex_unlock(&dec->usb_mutex);
-		kfree(b);
-		return result;
+		goto err;
 	}
 
 	result = usb_bulk_msg(dec->udev, dec->result_pipe, b,
@@ -360,9 +358,7 @@ static int ttusb_dec_send_command(struct ttusb_dec *dec, const u8 command,
 	if (result) {
 		printk("%s: result bulk message failed: error %d\n",
 		       __func__, result);
-		mutex_unlock(&dec->usb_mutex);
-		kfree(b);
-		return result;
+		goto err;
 	} else {
 		if (debug) {
 			printk(KERN_DEBUG "%s: result: %*ph\n",
@@ -373,12 +369,13 @@ static int ttusb_dec_send_command(struct ttusb_dec *dec, const u8 command,
 			*result_length = b[3];
 		if (cmd_result && b[3] > 0)
 			memcpy(cmd_result, &b[4], b[3]);
-
-		mutex_unlock(&dec->usb_mutex);
-
-		kfree(b);
-		return 0;
 	}
+
+err:
+	mutex_unlock(&dec->usb_mutex);
+
+	kfree(b);
+	return result;
 }
 
 static int ttusb_dec_get_stb_state (struct ttusb_dec *dec, unsigned int *mode,
-- 
2.31.1