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Commit 44ec9b30 authored by Thor Thayer's avatar Thor Thayer Committed by Borislav Petkov
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EDAC, altera: Check parent status for Arria10 EDAC block 



In preparation for the Arria10 ECC modules, check the status of the
parent in the device tree to ensure the block is enabled. Skip if no
parent phandle is set in the device tree.

Signed-off-by: default avatarThor Thayer <tthayer@opensource.altera.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-edac <linux-edac@vger.kernel.org>
Link: http://lkml.kernel.org/r/1466603939-7526-2-git-send-email-tthayer@opensource.altera.com


Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
parent 1cf70377

drivers/edac/altera_edac.c

+17 −0
Original line number Diff line number Diff line
@@ -1125,6 +1125,20 @@ static void altr_edac_a10_irq_handler(struct irq_desc *desc) 
	chained_irq_exit(chip, desc);

}



static int validate_parent_available(struct device_node *np)

{

	struct device_node *parent;

	int ret = 0;



	/* Ensure parent device is enabled if parent node exists */

	parent = of_parse_phandle(np, "altr,ecc-parent", 0);

	if (parent && !of_device_is_available(parent))

		ret = -ENODEV;



	of_node_put(parent);

	return ret;

}



static int altr_edac_a10_device_add(struct altr_arria10_edac *edac,

				    struct device_node *np)

{
@@ -1146,6 +1160,9 @@ static int altr_edac_a10_device_add(struct altr_arria10_edac *edac, 
	if (IS_ERR_OR_NULL(prv))

		return -ENODEV;



	if (validate_parent_available(np))

		return -ENODEV;



	if (!devres_open_group(edac->dev, altr_edac_a10_device_add, GFP_KERNEL))

		return -ENOMEM;