linux-kernel - Re: [PATCH 1/2] nfs/blocklayout: Don't attempt unregister for invalid block device

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Message-ID: <ZzyHqEDt8UXoAUyh@infradead.org>
Date: Tue, 19 Nov 2024 04:42:16 -0800
From: Christoph Hellwig <hch@...radead.org>
To: Benjamin Coddington <bcodding@...hat.com>
Cc: Trond Myklebust <trondmy@...nel.org>, Anna Schumaker <anna@...nel.org>,
	Chuck Lever <chuck.lever@...cle.com>, linux-nfs@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] nfs/blocklayout: Don't attempt unregister for
 invalid block device

On Mon, Nov 18, 2024 at 05:40:40PM -0500, Benjamin Coddington wrote:
> Since commit d869da91cccb, an unmount of a pNFS SCSI layout-enabled NFS

Please also spell out the commit subject in the commit log body, similar
to to the Fixes tag.

> index 6252f4447945..7ae79814f4ff 100644
> --- a/fs/nfs/blocklayout/dev.c
> +++ b/fs/nfs/blocklayout/dev.c
> @@ -16,13 +16,16 @@
>  
>  static void bl_unregister_scsi(struct pnfs_block_dev *dev)
>  {
> -	struct block_device *bdev = file_bdev(dev->bdev_file);
> -	const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
> +	struct block_device *bdev;
> +	const struct pr_ops *ops;
>  	int status;
>  
>  	if (!test_and_clear_bit(PNFS_BDEV_REGISTERED, &dev->flags))
>  		return;
>  
> +	bdev = file_bdev(dev->bdev_file);
> +	ops = bdev->bd_disk->fops->pr_ops;
> +

Hmm.  Just moving the test_and_clear_bit to the caller would
feel cleaner than this to me.

But either way the change looks good:

Reviewed-by: Christoph Hellwig <hch@....de>