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authorJulia Lawall <Julia.Lawall@lip6.fr>2013-12-29 23:47:36 +0100
committerMatthew Garrett <matthew.garrett@nebula.com>2014-01-21 08:44:17 -0500
commitb30bb89f0fb29502f573d01419391a1e2a4cc4f1 (patch)
tree7698fd123c24738df516325564cadca74997e559 /drivers/platform/x86
parent97f440c23f2b02fac8af0558cba9ca0bed603794 (diff)
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>
Diffstat (limited to 'drivers/platform/x86')
-rw-r--r--drivers/platform/x86/fujitsu-laptop.c15
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)