linux-kernel - [PATCH 1/3] driver core: warn that platform_driver

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Date:	Tue, 26 Mar 2013 10:35:15 +0100
From:	Fabio Porcedda <fabio.porcedda@...il.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Arnd Bergmann <arnd@...db.de>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	linux-kernel@...r.kernel.org,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Jean Delvare <khali@...ux-fr.org>
Subject: [PATCH 1/3] driver core: warn that platform_driver_probe can not use deferred probing

Add documentation that platform_driver_probe() is incompatible with
deferred probing.

Signed-off-by: Fabio Porcedda <fabio.porcedda@...il.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
---
 drivers/base/platform.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index c0b8df3..ef2afb1 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -555,7 +555,8 @@ EXPORT_SYMBOL_GPL(platform_driver_unregister);
 /**
  * platform_driver_probe - register driver for non-hotpluggable device
  * @drv: platform driver structure
- * @probe: the driver probe routine, probably from an __init section
+ * @probe: the driver probe routine, probably from an __init section,
+ *         must not return -EPROBE_DEFER.
  *
  * Use this instead of platform_driver_register() when you know the device
  * is not hotpluggable and has already been registered, and you want to
@@ -566,6 +567,9 @@ EXPORT_SYMBOL_GPL(platform_driver_unregister);
  * into system-on-chip processors, where the controller devices have been
  * configured as part of board setup.
  *
+ * This is incompatible with deferred probing so probe() must not
+ * return -EPROBE_DEFER.
+ *
  * Returns zero if the driver registered and bound to a device, else returns
  * a negative error code and with the driver not registered.
  */
-- 
1.8.2

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