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fault-inject: clean up debugfs file creation logic 

There is no need to check the return value of a debugfs_create_file
call, a caller should never change what they do depending on if debugfs
is working properly or not, so remove the checks, simplifying the logic
in the file a lot.

Also fix up the error check for debugfs_create_dir() which was not
returning NULL for an error, but rather a error pointer.

Cc: linux-kernel@vger.kernel.org
Reviewed-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Greg Kroah-Hartman 2019-06-12 11:58:28 +02:00
parent 9fd714cd7f
commit 053cf51040
1 changed files with 25 additions and 46 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

69
lib/fault-inject.c
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@ -166,10 +166,10 @@ static int debugfs_ul_get(void *data, u64 *val)
DEFINE_SIMPLE_ATTRIBUTE(fops_ul, debugfs_ul_get, debugfs_ul_set, "%llu\n");
static struct dentry *debugfs_create_ul(const char *name, umode_t mode,
static void debugfs_create_ul(const char *name, umode_t mode,
struct dentry *parent, unsigned long *value)
{
return debugfs_create_file(name, mode, parent, value, &fops_ul);
debugfs_create_file(name, mode, parent, value, &fops_ul);
}
#ifdef CONFIG_FAULT_INJECTION_STACKTRACE_FILTER
@ -185,12 +185,11 @@ static int debugfs_stacktrace_depth_set(void *data, u64 val)
DEFINE_SIMPLE_ATTRIBUTE(fops_stacktrace_depth, debugfs_ul_get,
debugfs_stacktrace_depth_set, "%llu\n");
static struct dentry *debugfs_create_stacktrace_depth(
const char *name, umode_t mode,
struct dentry *parent, unsigned long *value)
static void debugfs_create_stacktrace_depth(const char *name, umode_t mode,
struct dentry *parent,
unsigned long *value)
{
return debugfs_create_file(name, mode, parent, value,
&fops_stacktrace_depth);
debugfs_create_file(name, mode, parent, value, &fops_stacktrace_depth);
}
#endif /* CONFIG_FAULT_INJECTION_STACKTRACE_FILTER */
@ -202,51 +201,31 @@ struct dentry *fault_create_debugfs_attr(const char *name,
struct dentry *dir;
dir = debugfs_create_dir(name, parent);
if (!dir)
return ERR_PTR(-ENOMEM);
if (IS_ERR(dir))
return dir;
if (!debugfs_create_ul("probability", mode, dir, &attr->probability))
goto fail;
if (!debugfs_create_ul("interval", mode, dir, &attr->interval))
goto fail;
if (!debugfs_create_atomic_t("times", mode, dir, &attr->times))
goto fail;
if (!debugfs_create_atomic_t("space", mode, dir, &attr->space))
goto fail;
if (!debugfs_create_ul("verbose", mode, dir, &attr->verbose))
goto fail;
if (!debugfs_create_u32("verbose_ratelimit_interval_ms", mode, dir,
&attr->ratelimit_state.interval))
goto fail;
if (!debugfs_create_u32("verbose_ratelimit_burst", mode, dir,
&attr->ratelimit_state.burst))
goto fail;
if (!debugfs_create_bool("task-filter", mode, dir, &attr->task_filter))
goto fail;
debugfs_create_ul("probability", mode, dir, &attr->probability);
debugfs_create_ul("interval", mode, dir, &attr->interval);
debugfs_create_atomic_t("times", mode, dir, &attr->times);
debugfs_create_atomic_t("space", mode, dir, &attr->space);
debugfs_create_ul("verbose", mode, dir, &attr->verbose);
debugfs_create_u32("verbose_ratelimit_interval_ms", mode, dir,
&attr->ratelimit_state.interval);
debugfs_create_u32("verbose_ratelimit_burst", mode, dir,
&attr->ratelimit_state.burst);
debugfs_create_bool("task-filter", mode, dir, &attr->task_filter);
#ifdef CONFIG_FAULT_INJECTION_STACKTRACE_FILTER
if (!debugfs_create_stacktrace_depth("stacktrace-depth", mode, dir,
&attr->stacktrace_depth))
goto fail;
if (!debugfs_create_ul("require-start", mode, dir,
&attr->require_start))
goto fail;
if (!debugfs_create_ul("require-end", mode, dir, &attr->require_end))
goto fail;
if (!debugfs_create_ul("reject-start", mode, dir, &attr->reject_start))
goto fail;
if (!debugfs_create_ul("reject-end", mode, dir, &attr->reject_end))
goto fail;
debugfs_create_stacktrace_depth("stacktrace-depth", mode, dir,
&attr->stacktrace_depth);
debugfs_create_ul("require-start", mode, dir, &attr->require_start);
debugfs_create_ul("require-end", mode, dir, &attr->require_end);
debugfs_create_ul("reject-start", mode, dir, &attr->reject_start);
debugfs_create_ul("reject-end", mode, dir, &attr->reject_end);
#endif /* CONFIG_FAULT_INJECTION_STACKTRACE_FILTER */
attr->dname = dget(dir);
return dir;
fail:
debugfs_remove_recursive(dir);
return ERR_PTR(-ENOMEM);
}
EXPORT_SYMBOL_GPL(fault_create_debugfs_attr);