diff options
| author | Andrey Borzenkov <arvidjaar@mail.ru> | 2007-11-15 01:58:28 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-11-15 03:45:36 +0100 |
| commit | 1299342bacbe9038bef473d9b5b3cbebad112d4c (patch) | |
| tree | 4db9e41efdc68d8ac3a124920ef2b29c34243f1b /drivers/acpi/toshiba_acpi.c | |
| parent | eCryptfs: cast page->index to loff_t instead of off_t (diff) | |
| download | linux-1299342bacbe9038bef473d9b5b3cbebad112d4c.tar.xz linux-1299342bacbe9038bef473d9b5b3cbebad112d4c.zip | |
Fix Oops in toshiba_acpi error return path
When backlight_device_register() fails, return after undo initialization, do
not try to use pointer that just was reset to NULL
This fixes this oops:
[ 1595.177672] [<c010480a>] show_trace_log_lvl+0x1a/0x30
[ 1595.177706] [<c01052a2>] show_trace+0x12/0x20
[ 1595.177718] [<c0105305>] dump_stack+0x15/0x20
[ 1595.177728] [<c01c9375>] kobject_shadow_add+0x125/0x1c0
[ 1595.177754] [<c01c941a>] kobject_add+0xa/0x10
[ 1595.177764] [<c0239a37>] device_add+0x97/0x5d0
[ 1595.177776] [<c0239f82>] device_register+0x12/0x20
[ 1595.177786] [<dfd912df>] backlight_device_register+0x9f/0x110 [backlight]
[ 1595.177814] [<df861117>] toshiba_acpi_init+0x117/0x15e [toshiba_acpi]
[ 1595.177834] [<c013e28d>] sys_init_module+0xfd/0x14e0
[ 1595.177871] [<c0104112>] sysenter_past_esp+0x5f/0x99
[ 1595.177883] =======================
[ 1595.177890] Could not register toshiba backlight device
[ 1595.177985] BUG: unable to handle kernel NULL pointer dereference at virtual address 00000004
...
[ 1595.394097] EIP: 0060:[<df861143>] Not tainted VLI
[ 1595.394101] EFLAGS: 00010282 (2.6.23-rc9-1avb #24)
[ 1595.480081] EIP is at toshiba_acpi_init+0x143/0x15e [toshiba_acpi]
Signed-off-by: Andrey Borzenkov <arvidjaar@mail.ru>
Cc: John Belmonte <toshiba_acpi@memebeam.org>
Acked-by: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/acpi/toshiba_acpi.c')
| -rw-r--r-- | drivers/acpi/toshiba_acpi.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/acpi/toshiba_acpi.c b/drivers/acpi/toshiba_acpi.c index a736ef7bdee4..9e8c20c6a0b7 100644 --- a/drivers/acpi/toshiba_acpi.c +++ b/drivers/acpi/toshiba_acpi.c @@ -591,9 +591,12 @@ static int __init toshiba_acpi_init(void) NULL, &toshiba_backlight_data); if (IS_ERR(toshiba_backlight_device)) { + int ret = PTR_ERR(toshiba_backlight_device); + printk(KERN_ERR "Could not register toshiba backlight device\n"); toshiba_backlight_device = NULL; toshiba_acpi_exit(); + return ret; } toshiba_backlight_device->props.max_brightness = HCI_LCD_BRIGHTNESS_LEVELS - 1; |