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authorAndrey Borzenkov <arvidjaar@mail.ru>2007-11-14 16:58:28 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-11-14 18:45:36 -0800
commit1299342bacbe9038bef473d9b5b3cbebad112d4c (patch)
tree4db9e41efdc68d8ac3a124920ef2b29c34243f1b /drivers
parent8a146a2b0d6e97941a5c2dc5d8a3ea1e6c3ab997 (diff)
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')
-rw-r--r--drivers/acpi/toshiba_acpi.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/acpi/toshiba_acpi.c b/drivers/acpi/toshiba_acpi.c
index a736ef7bdee..9e8c20c6a0b 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;