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crypto: caam - Check for CAAM block presence before registering with crypto layer

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The layer which registers with the crypto API should check for the presence of
the CAAM device it is going to use.  If the platform's device tree doesn't have
the required CAAM node, the layer should return an error and not register the
algorithms with crypto API layer.

Signed-off-by: Ruchika Gupta <ruchika.gupta@freescale.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Ruchika Gupta
2014-07-07 10:42:12 +05:30
committed by Herbert Xu
parent 5b635e280e
commit 35af640386
3 changed files with 85 additions and 0 deletions
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28
drivers/crypto/caam/caamhash.c
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@@ -1793,8 +1793,36 @@ caam_hash_alloc(struct caam_hash_template *template,
static int __init caam_algapi_hash_init(void)
{
struct device_node *dev_node;
struct platform_device *pdev;
struct device *ctrldev;
void *priv;
int i = 0, err = 0;
dev_node = of_find_compatible_node(NULL, NULL, "fsl,sec-v4.0");
if (!dev_node) {
dev_node = of_find_compatible_node(NULL, NULL, "fsl,sec4.0");
if (!dev_node)
return -ENODEV;
}
pdev = of_find_device_by_node(dev_node);
if (!pdev) {
of_node_put(dev_node);
return -ENODEV;
}
ctrldev = &pdev->dev;
priv = dev_get_drvdata(ctrldev);
of_node_put(dev_node);
/*
* If priv is NULL, it's probably because the caam driver wasn't
* properly initialized (e.g. RNG4 init failed). Thus, bail out here.
*/
if (!priv)
return -ENODEV;
INIT_LIST_HEAD(&hash_list);
/* register crypto algorithms the device supports */