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Commit 07eb6fdf authored by Joerg Roedel's avatar Joerg Roedel
Browse files

iommu/pamu: WARN when fsl_pamu_probe() is called more than once 



The function probes the PAMU hardware from device-tree
specifications. It initializes global variables and can thus
be only safely called once.

Add a check that that prints a warning when its called more
than once.

Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent af29d9fa

drivers/iommu/fsl_pamu.c

+7 −0
Original line number Diff line number Diff line
@@ -42,6 +42,8 @@ struct pamu_isr_data { 
static struct paace *ppaact;

static struct paace *spaact;



static bool probed;			/* Has PAMU been probed? */



/*

 * Table for matching compatible strings, for device tree

 * guts node, for QorIQ SOCs.
@@ -1033,6 +1035,9 @@ static int fsl_pamu_probe(struct platform_device *pdev) 
	 * NOTE : All PAMUs share the same LIODN tables.

	 */



	if (WARN_ON(probed))

		return -EBUSY;



	pamu_regs = of_iomap(dev->of_node, 0);

	if (!pamu_regs) {

		dev_err(dev, "ioremap of PAMU node failed\n");
@@ -1172,6 +1177,8 @@ static int fsl_pamu_probe(struct platform_device *pdev) 


	setup_liodns();



	probed = true;



	return 0;



error_genpool: