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

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Message-Id: <1411768637-6809-3-git-send-email-mcgrof@do-not-panic.com>
Date:	Fri, 26 Sep 2014 14:57:14 -0700
From:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>
To:	gregkh@...uxfoundation.org, dmitry.torokhov@...il.com,
	tiwai@...e.de, tj@...nel.org, arjan@...ux.intel.com
Cc:	teg@...m.no, rmilasan@...e.com, werner@...e.com, oleg@...hat.com,
	hare@...e.com, bpoirier@...e.de, santosh@...lsio.com,
	pmladek@...e.cz, dbueso@...e.com, mcgrof@...e.com,
	linux-kernel@...r.kernel.org,
	Doug Thompson <dougthompson@...ssion.com>,
	Borislav Petkov <bp@...en8.de>,
	Mauro Carvalho Chehab <m.chehab@...sung.com>,
	linux-edac@...r.kernel.org
Subject: [PATCH v1 2/5] driver-core: enable drivers to opt-out of async probe

From: "Luis R. Rodriguez" <mcgrof@...e.com>

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@...nel.org>
Cc: Arjan van de Ven <arjan@...ux.intel.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Doug Thompson <dougthompson@...ssion.com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Mauro Carvalho Chehab <m.chehab@...sung.com>
Cc: linux-edac@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Luis R. Rodriguez <mcgrof@...e.com>
---
 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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