lkml.org 
[lkml]   [2019]   [Mar]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] ACPI / sysfs: Restructure get_status
Date
When building with -Wsometimes-uninitialized, Clang warns:

drivers/acpi/sysfs.c:667:13: warning: variable 'result' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]

Clang can't determine that all cases are covered by the two separate if
statements. We could combine then to look like this:

int result;

if (...) {
...
} else if {
...
} else {
result -EINVAL;
}

return result;

However, at that point, we can further simplify this function by only
using result when absolutely needed and just direct returning the value
of the function.

Link: https://github.com/ClangBuiltLinux/linux/issues/388
Suggested-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
---
drivers/acpi/sysfs.c | 13 ++++---------
1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/drivers/acpi/sysfs.c b/drivers/acpi/sysfs.c
index 41324f0b1bee..6ed785cadad9 100644
--- a/drivers/acpi/sysfs.c
+++ b/drivers/acpi/sysfs.c
@@ -651,23 +651,18 @@ static void acpi_global_event_handler(u32 event_type, acpi_handle device,
static int get_status(u32 index, acpi_event_status *status,
acpi_handle *handle)
{
- int result;
-
- if (index >= num_gpes + ACPI_NUM_FIXED_EVENTS)
- return -EINVAL;
-
if (index < num_gpes) {
- result = acpi_get_gpe_device(index, handle);
+ int result = acpi_get_gpe_device(index, handle);
if (result) {
ACPI_EXCEPTION((AE_INFO, AE_NOT_FOUND,
"Invalid GPE 0x%x", index));
return result;
}
- result = acpi_get_gpe_status(*handle, index, status);
+ return acpi_get_gpe_status(*handle, index, status);
} else if (index < (num_gpes + ACPI_NUM_FIXED_EVENTS))
- result = acpi_get_event_status(index - num_gpes, status);
+ return acpi_get_event_status(index - num_gpes, status);

- return result;
+ return -EINVAL;
}

static ssize_t counter_show(struct kobject *kobj,
--
2.21.0
\
 
 \ /
  Last update: 2019-03-07 18:38    [W:0.069 / U:26.244 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site