2019-01-22 15:23:04

by Greg Kroah-Hartman

Subject: [PATCH] b43: no need to check return value of debugfs_create functions

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: Kalle Valo <[email protected]>
Cc: [email protected]
Cc: [email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/net/wireless/broadcom/b43/debugfs.c | 36 +++++----------------
1 file changed, 8 insertions(+), 28 deletions(-)

diff --git a/drivers/net/wireless/broadcom/b43/debugfs.c b/drivers/net/wireless/broadcom/b43/debugfs.c
index 77046384dd80..976c8ec4e992 100644
--- a/drivers/net/wireless/broadcom/b43/debugfs.c
+++ b/drivers/net/wireless/broadcom/b43/debugfs.c
@@ -668,15 +668,13 @@ static void b43_remove_dynamic_debug(struct b43_wldev *dev)
static void b43_add_dynamic_debug(struct b43_wldev *dev)
{
struct b43_dfsentry *e = dev->dfsentry;
- struct dentry *d;

-#define add_dyn_dbg(name, id, initstate) do { \
- e->dyn_debug[id] = (initstate); \
- d = debugfs_create_bool(name, 0600, e->subdir, \
- &(e->dyn_debug[id])); \
- if (!IS_ERR(d)) \
- e->dyn_debug_dentries[id] = d; \
- } while (0)
+#define add_dyn_dbg(name, id, initstate) do { \
+ e->dyn_debug[id] = (initstate); \
+ e->dyn_debug_dentries[id] = \
+ debugfs_create_bool(name, 0600, e->subdir, \
+ &(e->dyn_debug[id])); \
+ } while (0)

add_dyn_dbg("debug_xmitpower", B43_DBG_XMITPOWER, false);
add_dyn_dbg("debug_dmaoverflow", B43_DBG_DMAOVERFLOW, false);
@@ -718,19 +716,6 @@ void b43_debugfs_add_device(struct b43_wldev *dev)

snprintf(devdir, sizeof(devdir), "%s", wiphy_name(dev->wl->hw->wiphy));
e->subdir = debugfs_create_dir(devdir, rootdir);
- if (!e->subdir || IS_ERR(e->subdir)) {
- if (e->subdir == ERR_PTR(-ENODEV)) {
- b43dbg(dev->wl, "DebugFS (CONFIG_DEBUG_FS) not "
- "enabled in kernel config\n");
- } else {
- b43err(dev->wl, "debugfs: cannot create %s directory\n",
- devdir);
- }
- dev->dfsentry = NULL;
- kfree(log->log);
- kfree(e);
- return;
- }

e->mmio16read_next = 0xFFFF; /* invalid address */
e->mmio32read_next = 0xFFFF; /* invalid address */
@@ -741,13 +726,10 @@ void b43_debugfs_add_device(struct b43_wldev *dev)

#define ADD_FILE(name, mode) \
do { \
- struct dentry *d; \
- d = debugfs_create_file(__stringify(name), \
+ e->file_##name.dentry = \
+ debugfs_create_file(__stringify(name), \
mode, e->subdir, dev, \
&fops_##name.fops); \
- e->file_##name.dentry = NULL; \
- if (!IS_ERR(d)) \
- e->file_##name.dentry = d; \
} while (0)


@@ -818,8 +800,6 @@ void b43_debugfs_log_txstat(struct b43_wldev *dev,
void b43_debugfs_init(void)
{
rootdir = debugfs_create_dir(KBUILD_MODNAME, NULL);
- if (IS_ERR(rootdir))
- rootdir = NULL;
}

void b43_debugfs_exit(void)
--
2.20.1

2019-01-22 15:46:30

by Larry Finger

Subject: Re: [PATCH] b43: no need to check return value of debugfs_create functions

On 1/22/19 9:21 AM, 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: Kalle Valo <[email protected]>
> Cc: [email protected]
> Cc: [email protected]
> Signed-off-by: Greg Kroah-Hartman <[email protected]>

Acked-by: Larry Finger <[email protected]>

Thanks,

Larry

2019-02-01 12:35:46

by Kalle Valo

Subject: Re: [PATCH] b43: no need to check return value of debugfs_create functions

Greg Kroah-Hartman <[email protected]> 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: Kalle Valo <[email protected]>
> Cc: [email protected]
> Cc: [email protected]
> Signed-off-by: Greg Kroah-Hartman <[email protected]>
> Acked-by: Larry Finger <[email protected]>

Patch applied to wireless-drivers-next.git, thanks.

e9bdcdc7cdf0 b43: no need to check return value of debugfs_create functions

--
https://patchwork.kernel.org/patch/10775733/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches