linux-kernel - [PATCH 1/4] uio: uio_cif: use devm_kzalloc() for uio

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Date:   Thu, 19 Nov 2020 17:49:00 +0200
From:   Alexandru Ardelean <alexandru.ardelean@...log.com>
To:     <linux-kernel@...r.kernel.org>
CC:     <gregkh@...uxfoundation.org>,
        Alexandru Ardelean <alexandru.ardelean@...log.com>
Subject: [PATCH 1/4] uio: uio_cif: use devm_kzalloc() for uio_info object

The uio_info object is free'd last, so it's life-time is tied PCI device
object. Using devm_kzalloc() cleans up the error path a bit and the exit
path.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
---
 drivers/uio/uio_cif.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/uio/uio_cif.c b/drivers/uio/uio_cif.c
index ab60186f9759..653f842a1491 100644
--- a/drivers/uio/uio_cif.c
+++ b/drivers/uio/uio_cif.c
@@ -43,12 +43,12 @@ static int hilscher_pci_probe(struct pci_dev *dev,
 {
 	struct uio_info *info;
 
-	info = kzalloc(sizeof(struct uio_info), GFP_KERNEL);
+	info = devm_kzalloc(&dev->dev, sizeof(struct uio_info), GFP_KERNEL);
 	if (!info)
 		return -ENOMEM;
 
 	if (pci_enable_device(dev))
-		goto out_free;
+		return -ENODEV;
 
 	if (pci_request_regions(dev, "hilscher"))
 		goto out_disable;
@@ -92,8 +92,6 @@ static int hilscher_pci_probe(struct pci_dev *dev,
 	pci_release_regions(dev);
 out_disable:
 	pci_disable_device(dev);
-out_free:
-	kfree (info);
 	return -ENODEV;
 }
 
@@ -105,8 +103,6 @@ static void hilscher_pci_remove(struct pci_dev *dev)
 	pci_release_regions(dev);
 	pci_disable_device(dev);
 	iounmap(info->mem[0].internal_addr);
-
-	kfree (info);
 }
 
 static struct pci_device_id hilscher_pci_ids[] = {
-- 
2.17.1