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fujitsu-laptop: fix error return code

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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>
This commit is contained in:
Julia Lawall 2013-12-29 23:47:36 +01:00 committed by Matthew Garrett
parent 97f440c23f
commit b30bb89f0f
1 changed files with 7 additions and 8 deletions
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15
drivers/platform/x86/fujitsu-laptop.c
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@ -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)