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Date: Fri, 14 Jun 2019 10:31:35 +0300
From: Jukka Rissanen <jukka.rissanen@...ux.intel.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Alexander Aring <alex.aring@...il.com>
Cc: "David S. Miller" <davem@...emloft.net>,
linux-bluetooth@...r.kernel.org, linux-wpan@...r.kernel.org,
netdev@...r.kernel.org
Subject: Re: [PATCH] 6lowpan: no need to check return value of
debugfs_create functions
Hi Greg,
Acked-by: Jukka Rissanen <jukka.rissanen@...ux.intel.com>
Cheers,
Jukka
On Fri, 2019-06-14 at 09:14 +0200, 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.
>
> Because we don't care if debugfs works or not, this trickles back a
> bit
> so we can clean things up by making some functions return void
> instead
> of an error value that is never going to fail.
>
> Cc: Alexander Aring <alex.aring@...il.com>
> Cc: Jukka Rissanen <jukka.rissanen@...ux.intel.com>
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: linux-bluetooth@...r.kernel.org
> Cc: linux-wpan@...r.kernel.org
> Cc: netdev@...r.kernel.org
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> ---
> net/6lowpan/6lowpan_i.h | 16 ++-----
> net/6lowpan/core.c | 8 +---
> net/6lowpan/debugfs.c | 97 +++++++++++--------------------------
> ----
> 3 files changed, 32 insertions(+), 89 deletions(-)
>
> diff --git a/net/6lowpan/6lowpan_i.h b/net/6lowpan/6lowpan_i.h
> index 53cf446ce2e3..01853cec0209 100644
> --- a/net/6lowpan/6lowpan_i.h
> +++ b/net/6lowpan/6lowpan_i.h
> @@ -18,24 +18,16 @@ extern const struct ndisc_ops lowpan_ndisc_ops;
> int addrconf_ifid_802154_6lowpan(u8 *eui, struct net_device *dev);
>
> #ifdef CONFIG_6LOWPAN_DEBUGFS
> -int lowpan_dev_debugfs_init(struct net_device *dev);
> +void lowpan_dev_debugfs_init(struct net_device *dev);
> void lowpan_dev_debugfs_exit(struct net_device *dev);
>
> -int __init lowpan_debugfs_init(void);
> +void __init lowpan_debugfs_init(void);
> void lowpan_debugfs_exit(void);
> #else
> -static inline int lowpan_dev_debugfs_init(struct net_device *dev)
> -{
> - return 0;
> -}
> -
> +static inline void lowpan_dev_debugfs_init(struct net_device *dev) {
> }
> static inline void lowpan_dev_debugfs_exit(struct net_device *dev) {
> }
>
> -static inline int __init lowpan_debugfs_init(void)
> -{
> - return 0;
> -}
> -
> +static inline void __init lowpan_debugfs_init(void) { }
> static inline void lowpan_debugfs_exit(void) { }
> #endif /* CONFIG_6LOWPAN_DEBUGFS */
>
> diff --git a/net/6lowpan/core.c b/net/6lowpan/core.c
> index 2d68351f1ac4..a068757eabaf 100644
> --- a/net/6lowpan/core.c
> +++ b/net/6lowpan/core.c
> @@ -42,9 +42,7 @@ int lowpan_register_netdevice(struct net_device
> *dev,
> if (ret < 0)
> return ret;
>
> - ret = lowpan_dev_debugfs_init(dev);
> - if (ret < 0)
> - unregister_netdevice(dev);
> + lowpan_dev_debugfs_init(dev);
>
> return ret;
> }
> @@ -152,9 +150,7 @@ static int __init lowpan_module_init(void)
> {
> int ret;
>
> - ret = lowpan_debugfs_init();
> - if (ret < 0)
> - return ret;
> + lowpan_debugfs_init();
>
> ret = register_netdevice_notifier(&lowpan_notifier);
> if (ret < 0) {
> diff --git a/net/6lowpan/debugfs.c b/net/6lowpan/debugfs.c
> index f5a8eec9d7a3..1c140af06d52 100644
> --- a/net/6lowpan/debugfs.c
> +++ b/net/6lowpan/debugfs.c
> @@ -163,11 +163,11 @@ static const struct file_operations
> lowpan_ctx_pfx_fops = {
> .release = single_release,
> };
>
> -static int lowpan_dev_debugfs_ctx_init(struct net_device *dev,
> - struct dentry *ctx, u8 id)
> +static void lowpan_dev_debugfs_ctx_init(struct net_device *dev,
> + struct dentry *ctx, u8 id)
> {
> struct lowpan_dev *ldev = lowpan_dev(dev);
> - struct dentry *dentry, *root;
> + struct dentry *root;
> char buf[32];
>
> WARN_ON_ONCE(id > LOWPAN_IPHC_CTX_TABLE_SIZE);
> @@ -175,34 +175,18 @@ static int lowpan_dev_debugfs_ctx_init(struct
> net_device *dev,
> sprintf(buf, "%d", id);
>
> root = debugfs_create_dir(buf, ctx);
> - if (!root)
> - return -EINVAL;
>
> - dentry = debugfs_create_file_unsafe("active", 0644, root,
> - &ldev->ctx.table[id],
> - &lowpan_ctx_flag_active_fop
> s);
> - if (!dentry)
> - return -EINVAL;
> + debugfs_create_file("active", 0644, root, &ldev->ctx.table[id],
> + &lowpan_ctx_flag_active_fops);
>
> - dentry = debugfs_create_file_unsafe("compression", 0644, root,
> - &ldev->ctx.table[id],
> - &lowpan_ctx_flag_c_fops);
> - if (!dentry)
> - return -EINVAL;
> -
> - dentry = debugfs_create_file("prefix", 0644, root,
> - &ldev->ctx.table[id],
> - &lowpan_ctx_pfx_fops);
> - if (!dentry)
> - return -EINVAL;
> + debugfs_create_file("compression", 0644, root, &ldev-
> >ctx.table[id],
> + &lowpan_ctx_flag_c_fops);
>
> - dentry = debugfs_create_file_unsafe("prefix_len", 0644, root,
> - &ldev->ctx.table[id],
> - &lowpan_ctx_plen_fops);
> - if (!dentry)
> - return -EINVAL;
> + debugfs_create_file("prefix", 0644, root, &ldev->ctx.table[id],
> + &lowpan_ctx_pfx_fops);
>
> - return 0;
> + debugfs_create_file("prefix_len", 0644, root, &ldev-
> >ctx.table[id],
> + &lowpan_ctx_plen_fops);
> }
>
> static int lowpan_context_show(struct seq_file *file, void *offset)
> @@ -242,64 +226,39 @@ static int lowpan_short_addr_get(void *data,
> u64 *val)
> DEFINE_DEBUGFS_ATTRIBUTE(lowpan_short_addr_fops,
> lowpan_short_addr_get, NULL,
> "0x%04llx\n");
>
> -static int lowpan_dev_debugfs_802154_init(const struct net_device
> *dev,
> +static void lowpan_dev_debugfs_802154_init(const struct net_device
> *dev,
> struct lowpan_dev *ldev)
> {
> - struct dentry *dentry, *root;
> + struct dentry *root;
>
> if (!lowpan_is_ll(dev, LOWPAN_LLTYPE_IEEE802154))
> - return 0;
> + return;
>
> root = debugfs_create_dir("ieee802154", ldev->iface_debugfs);
> - if (!root)
> - return -EINVAL;
> -
> - dentry = debugfs_create_file_unsafe("short_addr", 0444, root,
> - lowpan_802154_dev(dev)-
> >wdev->ieee802154_ptr,
> - &lowpan_short_addr_fops);
> - if (!dentry)
> - return -EINVAL;
>
> - return 0;
> + debugfs_create_file("short_addr", 0444, root,
> + lowpan_802154_dev(dev)->wdev-
> >ieee802154_ptr,
> + &lowpan_short_addr_fops);
> }
>
> -int lowpan_dev_debugfs_init(struct net_device *dev)
> +void lowpan_dev_debugfs_init(struct net_device *dev)
> {
> struct lowpan_dev *ldev = lowpan_dev(dev);
> - struct dentry *contexts, *dentry;
> - int ret, i;
> + struct dentry *contexts;
> + int i;
>
> /* creating the root */
> ldev->iface_debugfs = debugfs_create_dir(dev->name,
> lowpan_debugfs);
> - if (!ldev->iface_debugfs)
> - goto fail;
>
> contexts = debugfs_create_dir("contexts", ldev->iface_debugfs);
> - if (!contexts)
> - goto remove_root;
> -
> - dentry = debugfs_create_file("show", 0644, contexts,
> - &lowpan_dev(dev)->ctx,
> - &lowpan_context_fops);
> - if (!dentry)
> - goto remove_root;
> -
> - for (i = 0; i < LOWPAN_IPHC_CTX_TABLE_SIZE; i++) {
> - ret = lowpan_dev_debugfs_ctx_init(dev, contexts, i);
> - if (ret < 0)
> - goto remove_root;
> - }
>
> - ret = lowpan_dev_debugfs_802154_init(dev, ldev);
> - if (ret < 0)
> - goto remove_root;
> + debugfs_create_file("show", 0644, contexts, &lowpan_dev(dev)-
> >ctx,
> + &lowpan_context_fops);
>
> - return 0;
> + for (i = 0; i < LOWPAN_IPHC_CTX_TABLE_SIZE; i++)
> + lowpan_dev_debugfs_ctx_init(dev, contexts, i);
>
> -remove_root:
> - lowpan_dev_debugfs_exit(dev);
> -fail:
> - return -EINVAL;
> + lowpan_dev_debugfs_802154_init(dev, ldev);
> }
>
> void lowpan_dev_debugfs_exit(struct net_device *dev)
> @@ -307,13 +266,9 @@ void lowpan_dev_debugfs_exit(struct net_device
> *dev)
> debugfs_remove_recursive(lowpan_dev(dev)->iface_debugfs);
> }
>
> -int __init lowpan_debugfs_init(void)
> +void __init lowpan_debugfs_init(void)
> {
> lowpan_debugfs = debugfs_create_dir("6lowpan", NULL);
> - if (!lowpan_debugfs)
> - return -EINVAL;
> -
> - return 0;
> }
>
> void lowpan_debugfs_exit(void)
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