revert "ACPI: drivers/acpi: elide a non-zero test on a result that is never 0"
Revert commit 1192aeb957402b45f311895f124e4ca41206843c ("ACPI:
drivers/acpi: elide a non-zero test on a result that is never 0")
because it turns out that thermal_cooling_device_register() does
actually return NULL if CONFIG_THERMAL is turned off (then the routine
turns into a dummy inline routine in the header files that returns NULL
unconditionally).
This was found with randconfig testing, causing a crash during bootup:
initcall 0x78878534 ran for 13 msecs: acpi_button_init+0x0/0x51()
Calling initcall 0x78878585: acpi_fan_init+0x0/0x2c()
BUG: unable to handle kernel NULL pointer dereference at 00000000
IP: [<782b8ad0>] acpi_fan_add+0x7d/0xfd
*pde = 00000000
Oops: 0000 [#1]
Modules linked in:
Pid: 1, comm: swapper Not tainted (2.6.25-rc7-sched-devel.git-x86-latest.git #14)
EIP: 0060:[<782b8ad0>] EFLAGS: 00010246 CPU: 0
EIP is at acpi_fan_add+0x7d/0xfd
EAX: b787c718 EBX: b787c400 ECX: b782ceb4 EDX: 00000007
ESI: 00000000 EDI: b787c6f4 EBP: b782cee0 ESP: b782cecc
DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068
Process swapper (pid: 1, ti=b782c000 task=b7846000 task.ti=b782c000)
Stack: b787c459 00000000 b787c400 78790888 b787c60c b782cef8 782b6fb8 ffffffda
b787c60c 00000000 78790958 b782cf0c 783005d7 b787c60c 78790958 78790584
b782cf1c 783007f6 b782cf28 00000000 b782cf40 782ffc4a 78790958 b794d558
Call Trace:
[<782b6fb8>] ? acpi_device_probe+0x3e/0xdb
[<783005d7>] ? driver_probe_device+0x82/0xfc
[<783007f6>] ? __driver_attach+0x3a/0x70
[<782ffc4a>] ? bus_for_each_dev+0x3e/0x60
[<7830048c>] ? driver_attach+0x14/0x16
[<783007bc>] ? __driver_attach+0x0/0x70
[<7830006a>] ? bus_add_driver+0x9d/0x1b0
[<783008c3>] ? driver_register+0x47/0xa3
[<7813db00>] ? timespec_to_ktime+0x9/0xc
[<782b7331>] ? acpi_bus_register_driver+0x3a/0x3c
[<78878592>] ? acpi_fan_init+0xd/0x2c
[<78863656>] ? kernel_init+0xac/0x1f9
[<788635aa>] ? kernel_init+0x0/0x1f9
[<78114563>] ? kernel_thread_helper+0x7/0x10
=======================
Code: 6e 78 e8 57 44 e7 ff 58 e9 93 00 00 00 8b 55 f0 8d bb f4 02 00 00 80 4b 2d 10 8b 03 e8 87 cb ff ff 8d 83 18 03 00 00 80 63 2d ef <ff> 35 00 00 00 00 50 68 e8 9c 6e 78 e8 22 44 e7 ff b9 b6 9c 6e
EIP: [<782b8ad0>] acpi_fan_add+0x7d/0xfd SS:ESP 0068:b782cecc
---[ end trace 778e504de7e3b1e3 ]---
Kernel panic - not syncing: Attempted to kill init!
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Acked-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/acpi/fan.c b/drivers/acpi/fan.c
index 4d535c5..c8e3cba 100644
--- a/drivers/acpi/fan.c
+++ b/drivers/acpi/fan.c
@@ -260,22 +260,24 @@
result = PTR_ERR(cdev);
goto end;
}
- printk(KERN_INFO PREFIX
- "%s is registered as cooling_device%d\n",
- device->dev.bus_id, cdev->id);
+ if (cdev) {
+ printk(KERN_INFO PREFIX
+ "%s is registered as cooling_device%d\n",
+ device->dev.bus_id, cdev->id);
- acpi_driver_data(device) = cdev;
- result = sysfs_create_link(&device->dev.kobj,
- &cdev->device.kobj,
- "thermal_cooling");
- if (result)
- return result;
+ acpi_driver_data(device) = cdev;
+ result = sysfs_create_link(&device->dev.kobj,
+ &cdev->device.kobj,
+ "thermal_cooling");
+ if (result)
+ return result;
- result = sysfs_create_link(&cdev->device.kobj,
- &device->dev.kobj,
- "device");
- if (result)
- return result;
+ result = sysfs_create_link(&cdev->device.kobj,
+ &device->dev.kobj,
+ "device");
+ if (result)
+ return result;
+ }
result = acpi_fan_add_fs(device);
if (result)
diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c
index 3a136f6..36a68fa 100644
--- a/drivers/acpi/processor_core.c
+++ b/drivers/acpi/processor_core.c
@@ -674,20 +674,22 @@
result = PTR_ERR(pr->cdev);
goto end;
}
- printk(KERN_INFO PREFIX
- "%s is registered as cooling_device%d\n",
- device->dev.bus_id, pr->cdev->id);
+ if (pr->cdev) {
+ printk(KERN_INFO PREFIX
+ "%s is registered as cooling_device%d\n",
+ device->dev.bus_id, pr->cdev->id);
- result = sysfs_create_link(&device->dev.kobj,
- &pr->cdev->device.kobj,
- "thermal_cooling");
- if (result)
- return result;
- result = sysfs_create_link(&pr->cdev->device.kobj,
- &device->dev.kobj,
- "device");
- if (result)
- return result;
+ result = sysfs_create_link(&device->dev.kobj,
+ &pr->cdev->device.kobj,
+ "thermal_cooling");
+ if (result)
+ return result;
+ result = sysfs_create_link(&pr->cdev->device.kobj,
+ &device->dev.kobj,
+ "device");
+ if (result)
+ return result;
+ }
if (pr->flags.throttling) {
printk(KERN_INFO PREFIX "%s [%s] (supports",
diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index fe09b57..12fb44f 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -734,19 +734,21 @@
if (IS_ERR(device->cdev))
return;
- printk(KERN_INFO PREFIX
- "%s is registered as cooling_device%d\n",
- device->dev->dev.bus_id, device->cdev->id);
- result = sysfs_create_link(&device->dev->dev.kobj,
- &device->cdev->device.kobj,
- "thermal_cooling");
- if (result)
- printk(KERN_ERR PREFIX "Create sysfs link\n");
- result = sysfs_create_link(&device->cdev->device.kobj,
- &device->dev->dev.kobj,
- "device");
- if (result)
- printk(KERN_ERR PREFIX "Create sysfs link\n");
+ if (device->cdev) {
+ printk(KERN_INFO PREFIX
+ "%s is registered as cooling_device%d\n",
+ device->dev->dev.bus_id, device->cdev->id);
+ result = sysfs_create_link(&device->dev->dev.kobj,
+ &device->cdev->device.kobj,
+ "thermal_cooling");
+ if (result)
+ printk(KERN_ERR PREFIX "Create sysfs link\n");
+ result = sysfs_create_link(&device->cdev->device.kobj,
+ &device->dev->dev.kobj,
+ "device");
+ if (result)
+ printk(KERN_ERR PREFIX "Create sysfs link\n");
+ }
}
if (device->cap._DCS && device->cap._DSS){
static int count = 0;