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From: Christoph Hellwig <hch@infradead.org>
To: Jason Gunthorpe <jgg@nvidia.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	kvm@vger.kernel.org, "Rafael J. Wysocki" <rafael@kernel.org>
Subject: Re: [PATCH 02/10] driver core: Pull required checks into driver_probe_device()
Date: Tue, 8 Jun 2021 06:59:10 +0100	[thread overview]
Message-ID: <YL8HLhJNFgIGfEQm@infradead.org> (raw)
In-Reply-To: <2-v1-324b2038f212+1041f1-vfio3a_jgg@nvidia.com>

This looks good as-is, but a suggestions for incremental improvements
below:

> @@ -1032,10 +1035,10 @@ int device_driver_attach(struct device_driver *drv, struct device *dev)
>  	__device_driver_lock(dev, dev->parent);
>  
>  	/*
> -	 * If device has been removed or someone has already successfully
> -	 * bound a driver before us just skip the driver probe call.
> +	 * If device someone has already successfully bound a driver before us
> +	 * just skip the driver probe call.
>  	 */
> -	if (!dev->p->dead && !dev->driver)
> +	if (!dev->driver)
>  		ret = driver_probe_device(drv, dev);
>  
>  	__device_driver_unlock(dev, dev->parent);

It is kinda silly to keep the ->driver check here given that one caller
completely ignores the return value, and the other turns a 0 return into
-ENODEV anyway.  So I think this check can go away, turning
device_driver_attach into a trivial wrapper for driver_probe_device
that adds locking, which might be useful to reflect in the naming.

> @@ -1047,19 +1050,11 @@ static void __driver_attach_async_helper(void *_dev, async_cookie_t cookie)
>  {
>  	struct device *dev = _dev;
>  	struct device_driver *drv;
> -	int ret = 0;
> +	int ret;
>  
>  	__device_driver_lock(dev, dev->parent);
> -
>  	drv = dev->p->async_driver;
> -
> -	/*
> -	 * If device has been removed or someone has already successfully
> -	 * bound a driver before us just skip the driver probe call.
> -	 */
> -	if (!dev->p->dead && !dev->driver)
> -		ret = driver_probe_device(drv, dev);
> -
> +	ret = driver_probe_device(drv, dev);
>  	__device_driver_unlock(dev, dev->parent);

And that helper could be used here as well.

  reply	other threads:[~2021-06-08  5:59 UTC|newest]

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-08  0:55 [PATCH 00/10] Allow mdev drivers to directly create the vfio_device Jason Gunthorpe
2021-06-08  0:55 ` [Intel-gfx] " Jason Gunthorpe
2021-06-08  0:55 ` [PATCH 01/10] driver core: Do not continue searching for drivers if deferred probe is used Jason Gunthorpe
2021-06-08  5:51   ` Christoph Hellwig
2021-06-08  6:44   ` Greg Kroah-Hartman
2021-06-08 12:16     ` Jason Gunthorpe
2021-06-08 13:13       ` Greg Kroah-Hartman
2021-06-08 13:53         ` Jason Gunthorpe
2021-06-08  7:35   ` Greg Kroah-Hartman
2021-06-08 12:17     ` Jason Gunthorpe
2021-06-08  0:55 ` [PATCH 02/10] driver core: Pull required checks into driver_probe_device() Jason Gunthorpe
2021-06-08  5:59   ` Christoph Hellwig [this message]
2021-06-08 12:21     ` Jason Gunthorpe
2021-06-08  0:55 ` [PATCH 03/10] driver core: Flow the return code from ->probe() through to sysfs bind Jason Gunthorpe
2021-06-08  6:07   ` Christoph Hellwig
2021-06-08 23:53     ` Jason Gunthorpe
2021-06-08  6:47   ` Greg Kroah-Hartman
2021-06-08 12:30     ` Jason Gunthorpe
2021-06-08 13:16       ` Greg Kroah-Hartman
2021-06-08 14:03         ` Jason Gunthorpe
2021-06-08  0:55 ` [PATCH 04/10] driver core: Don't return EPROBE_DEFER to userspace during " Jason Gunthorpe
2021-06-08  6:14   ` Christoph Hellwig
2021-06-08  7:37   ` Greg Kroah-Hartman
2021-06-08  0:55 ` [PATCH 05/10] driver core: Export device_driver_attach() Jason Gunthorpe
2021-06-08  6:19   ` Christoph Hellwig
2021-06-08 12:33     ` Jason Gunthorpe
2021-06-08  0:55 ` [PATCH 06/10] vfio/mdev: Remove CONFIG_VFIO_MDEV_DEVICE Jason Gunthorpe
2021-06-08  0:55   ` [Intel-gfx] " Jason Gunthorpe
2021-06-08  6:20   ` Christoph Hellwig
2021-06-08  6:20     ` [Intel-gfx] " Christoph Hellwig
2021-06-11 12:40   ` Cornelia Huck
2021-06-11 12:40     ` [Intel-gfx] " Cornelia Huck
2021-06-14 12:35     ` Jason Gunthorpe
2021-06-14 12:35       ` [Intel-gfx] " Jason Gunthorpe
2021-06-14 12:35       ` Jason Gunthorpe
2021-06-08  0:55 ` [PATCH 07/10] vfio/mdev: Allow the mdev_parent_ops to specify the device driver to bind Jason Gunthorpe
2021-06-08  6:21   ` Christoph Hellwig
2021-06-08  0:55 ` [PATCH 08/10] vfio/mtty: Convert to use vfio_register_group_dev() Jason Gunthorpe
2021-06-08  0:55 ` [PATCH 09/10] vfio/mdpy: " Jason Gunthorpe
2021-06-08  0:55 ` [PATCH 10/10] vfio/mbochs: " Jason Gunthorpe
2021-06-08  6:22 ` [PATCH 00/10] Allow mdev drivers to directly create the vfio_device Christoph Hellwig
2021-06-08  6:22   ` [Intel-gfx] " Christoph Hellwig
2021-06-14 14:34 ` Kirti Wankhede
2021-06-14 14:34   ` [Intel-gfx] " Kirti Wankhede
2021-06-14 14:34   ` Kirti Wankhede
2021-06-14 14:36   ` Jason Gunthorpe
2021-06-14 14:36     ` [Intel-gfx] " Jason Gunthorpe
2021-06-14 14:36     ` Jason Gunthorpe

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