Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=5ebffd7c05391693b71d3326c8c78ff82f728ed0
Commit: 5ebffd7c05391693b71d3326c8c78ff82f728ed0
Parent: d80d02173360562625c10a526132fb87be4de2a4
Author: Maxime Austruy <[EMAIL PROTECTED]>
AuthorDate: Sun Jul 1 12:06:38 2007 -0700
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Sun Jul 1 12:29:44 2007 -0700
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 <[EMAIL PROTECTED]>
Cc: Len Brown <[EMAIL PROTECTED]>
Cc: Richard Purdie <[EMAIL PROTECTED]>
Cc: Jan Engelhardt <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
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 6d7d415..3cd79ca 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;
-
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