linux-kernel - [PATCH] Bluetooth: btmtkuart: add missed functions in the error paths of btmtuart

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Message-Id: <20200528102021.911709-1-hslester96@gmail.com>
Date:   Thu, 28 May 2020 18:20:21 +0800
From:   Chuhong Yuan <hslester96@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Sean Wang <sean.wang@...iatek.com>,
        Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-bluetooth@...r.kernel.org,
        linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Chuhong Yuan <hslester96@...il.com>
Subject: [PATCH] Bluetooth: btmtkuart: add missed functions in the error paths of btmtuart_probe()

btmtuart_probe() misses several function calls in its error paths,
including hci_free_dev() and clk_disable_unprepare().
Refactor the code and call correct undo functions to fix the error
paths.

Signed-off-by: Chuhong Yuan <hslester96@...il.com>
---
 drivers/bluetooth/btmtkuart.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/bluetooth/btmtkuart.c b/drivers/bluetooth/btmtkuart.c
index e11169ad8247..8a81fbca5c9d 100644
--- a/drivers/bluetooth/btmtkuart.c
+++ b/drivers/bluetooth/btmtkuart.c
@@ -1015,7 +1015,7 @@ static int btmtkuart_probe(struct serdev_device *serdev)
 	if (btmtkuart_is_standalone(bdev)) {
 		err = clk_prepare_enable(bdev->osc);
 		if (err < 0)
-			return err;
+			goto err_hci_free_dev;
 
 		if (bdev->boot) {
 			gpiod_set_value_cansleep(bdev->boot, 1);
@@ -1028,10 +1028,8 @@ static int btmtkuart_probe(struct serdev_device *serdev)
 
 		/* Power on */
 		err = regulator_enable(bdev->vcc);
-		if (err < 0) {
-			clk_disable_unprepare(bdev->osc);
-			return err;
-		}
+		if (err < 0)
+			goto err_clk_disable_unprepare;
 
 		/* Reset if the reset-gpios is available otherwise the board
 		 * -level design should be guaranteed.
@@ -1063,7 +1061,6 @@ static int btmtkuart_probe(struct serdev_device *serdev)
 	err = hci_register_dev(hdev);
 	if (err < 0) {
 		dev_err(&serdev->dev, "Can't register HCI device\n");
-		hci_free_dev(hdev);
 		goto err_regulator_disable;
 	}
 
@@ -1072,6 +1069,11 @@ static int btmtkuart_probe(struct serdev_device *serdev)
 err_regulator_disable:
 	if (btmtkuart_is_standalone(bdev))
 		regulator_disable(bdev->vcc);
+err_clk_disable_unprepare:
+	if (btmtkuart_is_standalone(bdev))
+		clk_disable_unprepare(bdev->osc);
+err_hci_free_dev:
+	hci_free_dev(hdev);
 
 	return err;
 }
-- 
2.26.2