linux-kernel - [PATCH 3.12 01/33] mfd: lpc_ich: Assign subdevice ids automatically

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Date:	Tue, 15 Sep 2015 16:21:56 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>, Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 01/33] mfd: lpc_ich: Assign subdevice ids automatically

From: Mika Westerberg <mika.westerberg@...ux.intel.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 1abf25a25b86dcfe28d243a5af71bd1c9d6de1ef upstream.

Using -1 as platform device id means that the platform driver core will not
assign any id to the device (the device name will not have id at all). This
results problems on systems that have multiple PCHs (Platform Controller
HUBs) because all of them also include their own copy of LPC device.

All the subsequent device creations will fail because there already exists
platform device with the same name.

Fix this by passing PLATFORM_DEVID_AUTO as platform device id. This makes
the platform device core to allocate new ids automatically.

Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
Signed-off-by: Lee Jones <lee.jones@...aro.org>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/mfd/lpc_ich.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/mfd/lpc_ich.c b/drivers/mfd/lpc_ich.c
index e775bfbc5e6e..5f187294c85a 100644
--- a/drivers/mfd/lpc_ich.c
+++ b/drivers/mfd/lpc_ich.c
@@ -872,8 +872,8 @@ gpe0_done:
 	lpc_ich_enable_gpio_space(dev);
 
 	lpc_ich_finalize_cell(dev, &lpc_ich_cells[LPC_GPIO]);
-	ret = mfd_add_devices(&dev->dev, -1, &lpc_ich_cells[LPC_GPIO],
-			      1, NULL, 0, NULL);
+	ret = mfd_add_devices(&dev->dev, PLATFORM_DEVID_AUTO,
+			      &lpc_ich_cells[LPC_GPIO], 1, NULL, 0, NULL);
 
 gpio_done:
 	if (acpi_conflict)
@@ -932,8 +932,8 @@ static int lpc_ich_init_wdt(struct pci_dev *dev)
 	}
 
 	lpc_ich_finalize_cell(dev, &lpc_ich_cells[LPC_WDT]);
-	ret = mfd_add_devices(&dev->dev, -1, &lpc_ich_cells[LPC_WDT],
-			      1, NULL, 0, NULL);
+	ret = mfd_add_devices(&dev->dev, PLATFORM_DEVID_AUTO,
+			      &lpc_ich_cells[LPC_WDT], 1, NULL, 0, NULL);
 
 wdt_done:
 	return ret;
-- 
2.5.2

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