linux-kernel - [PATCH 08/14] media: wl128x-radio: use device managed memory allocation

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Date:   Fri, 21 Dec 2018 02:17:46 +0100
From:   Sebastian Reichel <sre@...nel.org>
To:     Sebastian Reichel <sre@...nel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Marcel Holtmann <marcel@...tmann.org>,
        Tony Lindgren <tony@...mide.com>
Cc:     Rob Herring <robh@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Pavel Machek <pavel@....cz>, linux-bluetooth@...r.kernel.org,
        linux-media@...r.kernel.org, linux-omap@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Sebastian Reichel <sebastian.reichel@...labora.com>
Subject: [PATCH 08/14] media: wl128x-radio: use device managed memory allocation

From: Sebastian Reichel <sebastian.reichel@...labora.com>

This simplifies memory allocation and removes a few useless
errors in case of -ENOMEM errors.

Signed-off-by: Sebastian Reichel <sebastian.reichel@...labora.com>
---
 drivers/media/radio/wl128x/fmdrv_common.c | 41 +++++++----------------
 1 file changed, 13 insertions(+), 28 deletions(-)

diff --git a/drivers/media/radio/wl128x/fmdrv_common.c b/drivers/media/radio/wl128x/fmdrv_common.c
index 9526613adf91..3f189d093eeb 100644
--- a/drivers/media/radio/wl128x/fmdrv_common.c
+++ b/drivers/media/radio/wl128x/fmdrv_common.c
@@ -1614,55 +1614,40 @@ int fmc_release(struct fmdev *fmdev)
 	return ret;
 }
 
-static int wl128x_fm_probe(struct platform_device *dev)
+static int wl128x_fm_probe(struct platform_device *pdev)
 {
-	struct fmdev *fmdev = NULL;
-	int ret = -ENOMEM;
-
-	fmdbg("FM driver\n");
+	struct fmdev *fmdev;
+	int ret;
 
 	/* Allocate memory for FM driver context and RX RDS buffer. */
-	fmdev = kzalloc(sizeof(struct fmdev), GFP_KERNEL);
-	if (NULL == fmdev) {
-		fmerr("Can't allocate operation structure memory\n");
-		return ret;
-	}
+	fmdev = devm_kzalloc(&pdev->dev, sizeof(*fmdev), GFP_KERNEL);
+	if (!fmdev)
+		return -ENOMEM;
+	platform_set_drvdata(pdev, fmdev);
+
 	fmdev->rx.rds.buf_size = default_rds_buf * FM_RDS_BLK_SIZE;
-	fmdev->rx.rds.buff = kzalloc(fmdev->rx.rds.buf_size, GFP_KERNEL);
-	if (NULL == fmdev->rx.rds.buff) {
-		fmerr("Can't allocate rds ring buffer\n");
-		goto rel_dev;
-	}
+	fmdev->rx.rds.buff = devm_kzalloc(&pdev->dev, fmdev->rx.rds.buf_size, GFP_KERNEL);
+	if (!fmdev->rx.rds.buff)
+		return -ENOMEM;
 
 	/* Ask FM V4L module to register video device. */
 	ret = fm_v4l2_init_video_device(fmdev, radio_nr);
 	if (ret < 0)
-		goto rel_rdsbuf;
+		return ret;
 
 	fmdev->irq_info.handlers = int_handler_table;
 	fmdev->curr_fmmode = FM_MODE_OFF;
 	fmdev->tx_data.pwr_lvl = FM_PWR_LVL_DEF;
 	fmdev->tx_data.preemph = FM_TX_PREEMPH_50US;
 	return ret;
-
-rel_rdsbuf:
-	kfree(fmdev->rx.rds.buff);
-rel_dev:
-	kfree(fmdev);
-
-	return ret;
 }
 
-static int wl128x_fm_remove(struct platform_device *dev)
+static int wl128x_fm_remove(struct platform_device *pdev)
 {
 	struct fmdev *fmdev = platform_get_drvdata(pdev);
 
 	/* Ask FM V4L module to unregister video device */
 	fm_v4l2_deinit_video_device(fmdev);
-	if (fmdev != NULL) {
-		kfree(fmdev->rx.rds.buff);
-		kfree(fmdev);
-	}
 
 	return 0;
 }
-- 
2.19.2