linux-kernel - [PATCH v3 1/2] virt: vbox: Add check for device_create

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Message-Id: <20220901131506.3550180-1-jiasheng@iscas.ac.cn>
Date:   Thu,  1 Sep 2022 21:15:06 +0800
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     gregkh@...uxfoundation.org
Cc:     hdegoede@...hat.com, arnd@...db.de, linux-kernel@...r.kernel.org,
        Jiasheng Jiang <jiasheng@...as.ac.cn>
Subject: [PATCH v3 1/2] virt: vbox: Add check for device_create_file

As device_create_file() can return error number,
it should be better to check the return value and
deal with the exception.
Moreover, this driver should be using an attribute group.

Fixes: 0ba002bc4393 ("virt: Add vboxguest driver for Virtual Box Guest integration")
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
---
Change log:

v2-> v3:

1. Switch to use an attribute group.

v1 -> v2:

1. Use gdev->dev instead of dev.
2. Remove file when creation failed.
---
 drivers/virt/vboxguest/vboxguest_linux.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/virt/vboxguest/vboxguest_linux.c b/drivers/virt/vboxguest/vboxguest_linux.c
index 4ccfd30c2a30..6fc81347ae72 100644
--- a/drivers/virt/vboxguest/vboxguest_linux.c
+++ b/drivers/virt/vboxguest/vboxguest_linux.c
@@ -270,6 +270,13 @@ static ssize_t host_features_show(struct device *dev,
 static DEVICE_ATTR_RO(host_version);
 static DEVICE_ATTR_RO(host_features);
 
+static struct attribute *vbg_pci_attrs[] = {
+	&dev_attr_host_version.attr,
+	&dev_attr_host_features.attr,
+	NULL,
+};
+ATTRIBUTE_GROUPS(vbg_pci);
+
 /**
  * Does the PCI detection and init of the device.
  *
@@ -390,8 +397,6 @@ static int vbg_pci_probe(struct pci_dev *pci, const struct pci_device_id *id)
 	}
 
 	pci_set_drvdata(pci, gdev);
-	device_create_file(dev, &dev_attr_host_version);
-	device_create_file(dev, &dev_attr_host_features);
 
 	vbg_info("vboxguest: misc device minor %d, IRQ %d, I/O port %x, MMIO at %pap (size %pap)\n",
 		 gdev->misc_device.minor, pci->irq, gdev->io_port,
@@ -422,8 +427,6 @@ static void vbg_pci_remove(struct pci_dev *pci)
 	mutex_unlock(&vbg_gdev_mutex);
 
 	free_irq(pci->irq, gdev);
-	device_remove_file(gdev->dev, &dev_attr_host_features);
-	device_remove_file(gdev->dev, &dev_attr_host_version);
 	misc_deregister(&gdev->misc_device_user);
 	misc_deregister(&gdev->misc_device);
 	vbg_core_exit(gdev);
@@ -488,6 +491,7 @@ MODULE_DEVICE_TABLE(pci,  vbg_pci_ids);
 
 static struct pci_driver vbg_pci_driver = {
 	.name		= DEVICE_NAME,
+	.dev_groups	= vbg_pci_groups,
 	.id_table	= vbg_pci_ids,
 	.probe		= vbg_pci_probe,
 	.remove		= vbg_pci_remove,
-- 
2.25.1