Re: [PATCH] block: aoe: no need to check return value of debugfs_create functions

Omar Sandoval
2019-01-22T23:29:39Z

On Tue, Jan 22, 2019 at 04:21:04PM +0100, Greg Kroah-Hartman wrote:
> When calling debugfs functions, there is no need to ever check the
> return value. The function can work or not, but the code logic should
> never do something different based on this.
>
> Cc: "Ed L. Cashin" <ed.cashin@acm.org>
> Cc: Jens Axboe <axboe@kernel.dk>
> Cc: linux-block@vger.kernel.org
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> ---
> drivers/block/aoe/aoeblk.c | 13 +------------
> 1 file changed, 1 insertion(+), 12 deletions(-)
>
> diff --git a/drivers/block/aoe/aoeblk.c b/drivers/block/aoe/aoeblk.c
> index e2c6aae2d636..b602646bfa04 100644
> --- a/drivers/block/aoe/aoeblk.c
> +++ b/drivers/block/aoe/aoeblk.c
> @@ -207,14 +207,7 @@ aoedisk_add_debugfs(struct aoedev *d)
> else
> p++;
> BUG_ON(*p == '\0');
> - entry = debugfs_create_file(p, 0444, aoe_debugfs_dir, d,
> - &aoe_debugfs_fops);
> - if (IS_ERR_OR_NULL(entry)) {
> - pr_info("aoe: cannot create debugfs file for %s\n",
> - d->gd->disk_name);
> - return;
> - }
> - BUG_ON(d->debugfs);
> + debugfs_create_file(p, 0444, aoe_debugfs_dir, d, &aoe_debugfs_fops);
> d->debugfs = entry;

Now entry is uninitialized here when we assign it to d->debugfs.

> }
> void
> @@ -472,10 +465,6 @@ aoeblk_init(void)
> if (buf_pool_cache == NULL)
> return -ENOMEM;
> aoe_debugfs_dir = debugfs_create_dir("aoe", NULL);
> - if (IS_ERR_OR_NULL(aoe_debugfs_dir)) {
> - pr_info("aoe: cannot create debugfs directory\n");
> - aoe_debugfs_dir = NULL;
> - }
> return 0;
> }
>
> --
> 2.20.1
>