[PATCH v1 2/5] driver-core: enable drivers to opt-out of async probe

[Luis R. Rodriguez]

From: "Luis R. Rodriguez" <mcgrof@xxxxxxxx>

We'll soon add generic support for asynchronous probe, before
that gets merged lets let drivers annotate if they should never
probe asynchronously.

Cc: Tejun Heo <tj@xxxxxxxxxx>
Cc: Arjan van de Ven <arjan@xxxxxxxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Doug Thompson <dougthompson@xxxxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Mauro Carvalho Chehab <m.chehab@xxxxxxxxxxx>
Cc: linux-edac@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Signed-off-by: Luis R. Rodriguez <mcgrof@xxxxxxxx>
---
 include/linux/device.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/device.h b/include/linux/device.h
index 43d183a..4de6328 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -200,6 +200,10 @@ extern struct klist *bus_get_device_klist(struct bus_type *bus);
  * @owner:	The module owner.
  * @mod_name:	Used for built-in modules.
  * @suppress_bind_attrs: Disables bind/unbind via sysfs.
+ * @sync_probe: requests probe to be run always be run synchronously even
+ * 	if userspace asked us to run asynchronously. Some devices drivers
+ * 	may be known to not work well with async probe, use this to annotate
+ * 	your driver if you know it needs synchronous probe.
  * @of_match_table: The open firmware table.
  * @acpi_match_table: The ACPI match table.
  * @probe:	Called to query the existence of a specific device,
@@ -233,6 +237,7 @@ struct device_driver {
 	const char		*mod_name;	/* used for built-in modules */
 
 	bool suppress_bind_attrs;	/* disables bind/unbind via sysfs */
+	bool sync_probe;
 
 	const struct of_device_id	*of_match_table;
 	const struct acpi_device_id	*acpi_match_table;
-- 
2.1.0

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