Re: [PATCH] virt: vbox: Add check for device_create_file

From: Greg KH
Date: Thu Sep 01 2022 - 04:17:47 EST


On Thu, Sep 01, 2022 at 03:45:21PM +0800, Jiasheng Jiang wrote:
> As device_create_file() can return error number,
> it should be better to check the return value and
> deal with the exception.
>
> Fixes: 0ba002bc4393 ("virt: Add vboxguest driver for Virtual Box Guest integration")
> Signed-off-by: Jiasheng Jiang <jiasheng@xxxxxxxxxxx>
> ---
> drivers/virt/vboxguest/vboxguest_linux.c | 9 +++++++--
> 1 file changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/virt/vboxguest/vboxguest_linux.c b/drivers/virt/vboxguest/vboxguest_linux.c
> index 4ccfd30c2a30..0fee8e6ee6e0 100644
> --- a/drivers/virt/vboxguest/vboxguest_linux.c
> +++ b/drivers/virt/vboxguest/vboxguest_linux.c
> @@ -390,8 +390,13 @@ 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);
> +
> + ret = device_create_file(dev, &dev_attr_host_version);
> + if (ret)
> + goto err_unregister_misc_device_user;
> + ret = device_create_file(dev, &dev_attr_host_features);
> + if (ret)
> + goto err_unregister_misc_device_user;

No, this driver should be using an attribute group, please switch it to
use that instead.

> 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,

This should also be removed, when drivers are working properly, they are
quiet. But that can be a second patch in your series.

thanks,

greg k-h