diff options
| author | Maxime Austruy <maxime@tralhalla.org> | 2007-07-01 23:06:38 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-01 23:29:44 +0400 |
| commit | 5ebffd7c05391693b71d3326c8c78ff82f728ed0 (patch) | |
| tree | 8380be53dfe5e9e453572b64052a618ba4a2cf9f /drivers/acpi/asus_acpi.c | |
| parent | d80d02173360562625c10a526132fb87be4de2a4 (diff) | |
| download | linux-5ebffd7c05391693b71d3326c8c78ff82f728ed0.tar.xz | |
asus_acpi: fix oops on non-asus machines
If asus_acpi_init doesn't find any device it knows about, it mistakenly
returns a "success" error code even though it cleans up after itself. Later
when trying to rmmod asus_acpi, the module_exit routine would try to clean up
one more time and we would end up calling
acpi_bus_unregister_driver(&asus_hotk_driver) twice. This patch addresses
this first problem by returning -ENODEV when no appropriate device is found.
Then there was also another bug with the code handling the return value of
backlight_device_register. If this function ever failed, the driver would
cleanup by calling the module_exit routine from module_init, but it would
still return "success". So any attempt to rmmod this module would result in
asus_acpi_exit being called twice but it's not ready to handle it (I haven't
hit this bug, just found it by code inspection). This patch fixes that by
inserting a return -ENODEV; at the end of this error handling path.
Signed-off-by: Maxime Austruy <maxime@tralhalla.org>
Cc: Len Brown <lenb@kernel.org>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: Jan Engelhardt <jengelh@computergmbh.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/acpi/asus_acpi.c')
| -rw-r--r-- | drivers/acpi/asus_acpi.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/acpi/asus_acpi.c b/drivers/acpi/asus_acpi.c index 6d7d4157e049..3cd79caad70c 100644 --- a/drivers/acpi/asus_acpi.c +++ b/drivers/acpi/asus_acpi.c @@ -1398,7 +1398,7 @@ static int __init asus_acpi_init(void) if (!asus_hotk_found) { acpi_bus_unregister_driver(&asus_hotk_driver); remove_proc_entry(PROC_ASUS, acpi_root_dir); - return result; + return -ENODEV; } asus_backlight_device = backlight_device_register("asus",NULL,NULL, @@ -1407,6 +1407,7 @@ static int __init asus_acpi_init(void) printk(KERN_ERR "Could not register asus backlight device\n"); asus_backlight_device = NULL; asus_acpi_exit(); + return -ENODEV; } asus_backlight_device->props.max_brightness = 15; |