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driver core: Don't do deferred probe in parallel with kernel_init thread

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The current deferred probe implementation can mess up suspend/resume
ordering if deferred probe thread is kicked off in parallel with the
main initcall thread (kernel_init thread) [1].

For example:

Say device-B is a consumer of device-A.

Initcall thread					Deferred probe thread
===============					=====================
1. device-A is added.
2. device-B is added.
3. dpm_list is now [device-A, device-B].
4. driver-A defers probe of device-A.
						5. device-A is moved to
						   end of dpm_list
						6. dpm_list is now
						   [device-B, device-A]
7. driver-B is registereed and probes device-B.
8. dpm_list stays as [device-B, device-A].

The reverse order of dpm_list is used for suspend. So in this case
device-A would incorrectly get suspended before device-B.

Commit 716a7a2596 ("driver core: fw_devlink: Add support for batching
fwnode parsing") kicked off the deferred probe thread early during boot
to run in parallel with the initcall thread and caused suspend/resume
regressions.  This patch removes the parallel run of the deferred probe
thread to avoid the suspend/resume regressions.

[1] - https://lore.kernel.org/lkml/CAGETcx8W96KAw-d_siTX4qHB_-7ddk0miYRDQeHE6E0_8qx-6Q@mail.gmail.com/

Fixes: 716a7a2596 ("driver core: fw_devlink: Add support for batching fwnode parsing")
Signed-off-by: Saravana Kannan <saravanak@google.com>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20200701194259.3337652-2-saravanak@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Saravana Kannan 2020-07-01 12:42:57 -07:00 committed by Greg Kroah-Hartman
parent 9ebcfadb06
commit cec72f3efc
3 changed files with 0 additions and 7 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

1
drivers/base/base.h
View file

@ -153,7 +153,6 @@ extern char *make_class_name(const char *name, struct kobject *kobj);
extern int devres_release_all(struct device *dev);
extern void device_block_probing(void);
extern void device_unblock_probing(void);
extern void driver_deferred_probe_force_trigger(void);
/* /sys/devices directory */
extern struct kset *devices_kset;

1
drivers/base/core.c
View file

@ -1323,7 +1323,6 @@ void fw_devlink_resume(void)
goto out;
device_link_add_missing_supplier_links();
driver_deferred_probe_force_trigger();
out:
mutex_unlock(&defer_fw_devlink_lock);
}

5
drivers/base/dd.c
View file

@ -164,11 +164,6 @@ static void driver_deferred_probe_trigger(void)
if (!driver_deferred_probe_enable)
return;
driver_deferred_probe_force_trigger();
}
void driver_deferred_probe_force_trigger(void)
{
/*
* A successful probe means that all the devices in the pending list
* should be triggered to be reprobed. Move all the deferred devices