fujitsu-laptop: fix error return code

These functions mix the use of result and error.  In acpi_fujitsu_add,
result does not seem useful; it would seem reasonable to propagate the
return value of acpi_bus_update_power in an error case.  On the other hand,
in the case of acpi_fujitsu_hotkey_add, there is an initialization of
result that can lead to what looks like a failure case, but that does not
abort the function.  The variable result is kept for this case.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
(
if@p1 (\(ret < 0\|ret != 0\))
 { ... return ret; }
|
ret@p1 = 0
)
... when != ret = e1
    when != &ret
*if(...)
{
  ... when != ret = e2
      when forall
 return ret;
}

// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Matthew Garrett <matthew.garrett@nebula.com>

1 files changed, 7 insertions, 8 deletions

diff --git a/drivers/platform/x86/fujitsu-laptop.c b/drivers/platform/x86/fujitsu-laptop.c
index 9d30d69aa78f..be02bcc346d3 100644
--- a/drivers/platform/x86/fujitsu-laptop.c
+++ b/drivers/platform/x86/fujitsu-laptop.c
@@ -633,7 +633,6 @@ static struct dmi_system_id fujitsu_dmi_table[] = {
 
 static int acpi_fujitsu_add(struct acpi_device *device)
 {
-        int result = 0;
         int state = 0;
         struct input_dev *input;
         int error;
@@ -669,8 +668,8 @@ static int acpi_fujitsu_add(struct acpi_device *device)
         if (error)
                 goto err_free_input_dev;
 
-        result = acpi_bus_update_power(fujitsu->acpi_handle, &state);
-        if (result) {
+        error = acpi_bus_update_power(fujitsu->acpi_handle, &state);
+        if (error) {
                 pr_err("Error reading power state\n");
                 goto err_unregister_input_dev;
         }
@@ -700,7 +699,7 @@ static int acpi_fujitsu_add(struct acpi_device *device)
                 fujitsu->max_brightness = FUJITSU_LCD_N_LEVELS;
         get_lcd_level();
 
-        return result;
+        return 0;
 
 err_unregister_input_dev:
         input_unregister_device(input);
@@ -708,7 +707,7 @@ err_unregister_input_dev:
 err_free_input_dev:
         input_free_device(input);
 err_stop:
-        return result;
+        return error;
 }
 
 static int acpi_fujitsu_remove(struct acpi_device *device)
@@ -831,8 +830,8 @@ static int acpi_fujitsu_hotkey_add(struct acpi_device *device)
         if (error)
                 goto err_free_input_dev;
 
-        result = acpi_bus_update_power(fujitsu_hotkey->acpi_handle, &state);
-        if (result) {
+        error = acpi_bus_update_power(fujitsu_hotkey->acpi_handle, &state);
+        if (error) {
                 pr_err("Error reading power state\n");
                 goto err_unregister_input_dev;
         }
@@ -907,7 +906,7 @@ err_free_input_dev:
 err_free_fifo:
         kfifo_free(&fujitsu_hotkey->fifo);
 err_stop:
-        return result;
+        return error;
 }
 
 static int acpi_fujitsu_hotkey_remove(struct acpi_device *device)