> This mail didn't make it into the archive on lore.kernel.org. Did
> someone receive it? If not, that would explain why I didn't get any
> feedback on it ...
First time I see it.
>> diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
>> index 9531dd0fef50..fddca263ac40 100644
>> --- a/drivers/acpi/bus.c
>> +++ b/drivers/acpi/bus.c
>> @@ -518,13 +518,15 @@ static void acpi_bus_notify(acpi_handle handle,
>> u32 type, void *data)
>> if (!adev)
>> goto err;
>>
>> - if (adev->dev.driver) {
>> + device_lock(&adev->dev);
>> + if (device_is_bound(&adev->dev)) {
>> struct acpi_driver *driver = to_acpi_driver(adev->dev.driver);
>>
>> if (driver && driver->ops.notify &&
>> (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
>> driver->ops.notify(adev, type);
>> }
>> + device_unlock(&adev->dev);
>>
>> if (!hotplug_event) {
>> acpi_put_acpi_dev(adev);
>>
This patch works, in that the kernel reaches early userspace reliably.
I would want to test it more extensively, i.e. install the modules and
run it for real instead of just kexec-ing the bzImage. I'll test Rafael's
patch first.
Full disclosure: I made small changes to the starting .config, see below.
6.3-rc1 is still bad with the new .config, the patch makes it good.
The changes:
1) PROVE_LOCKING=y
2) CONFIG_DEBUG_ATOMIC_SLEEP=y (why not, what could go wrong :)
3) radeon driver modular instead of built-in.
I don't think it matters. Here is the diffconfig, just in case.
-EXTRA_FIRMWARE_DIR "/lib/firmware"
CEC_CORE y -> m
DEBUG_ATOMIC_SLEEP n -> y
DEBUG_LOCK_ALLOC n -> y
DEBUG_MUTEXES n -> y
DEBUG_RT_MUTEXES n -> y
DEBUG_RWSEMS n -> y
DEBUG_SPINLOCK n -> y
DEBUG_WW_MUTEX_SLOWPATH n -> y
DRM_DISPLAY_HELPER y -> m
DRM_KMS_HELPER y -> m
DRM_RADEON y -> m
DRM_TTM y -> m
DRM_TTM_HELPER y -> m
EXTRA_FIRMWARE "radeon/R300_cp.bin" -> ""
FB_CFB_COPYAREA y -> m
FB_CFB_FILLRECT y -> m
FB_CFB_IMAGEBLIT y -> m
FB_SYS_COPYAREA y -> m
FB_SYS_FILLRECT y -> m
FB_SYS_FOPS y -> m
FB_SYS_IMAGEBLIT y -> m
I2C_ALGOBIT y -> m
PROVE_LOCKING n -> y
+DEBUG_LOCKDEP n
+LOCKDEP y
+LOCKDEP_BITS 15
+LOCKDEP_CHAINS_BITS 16
+LOCKDEP_CIRCULAR_QUEUE_BITS 12
+LOCKDEP_STACK_TRACE_BITS 19
+LOCKDEP_STACK_TRACE_HASH_BITS 14
+PREEMPTIRQ_TRACEPOINTS y
+PROVE_RAW_LOCK_NESTING n
+PROVE_RCU y
+TRACE_IRQFLAGS y
+TRACE_IRQFLAGS_NMI y
