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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: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Joerg Roedel 2017-08-09 16:15:43 +02:00
parent af29d9fa41
commit 07eb6fdf49
1 changed files with 7 additions and 0 deletions
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7
drivers/iommu/fsl_pamu.c
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@ -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: