diff options
| author | Ruchika Gupta <ruchika.gupta@freescale.com> | 2014-07-07 05:12:12 (GMT) |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2014-07-10 08:50:33 (GMT) |
| commit | 35af64038623865015d1786360cdbbcc2e72d78b (patch) | |
| tree | 6cf62a6f27b022c33f9d2029692730cbba750958 /drivers/crypto/caam/caamrng.c | |
| parent | 5b635e280efce5b735042c7ffa2487c4ba8fb4bf (diff) | |
| download | linux-35af64038623865015d1786360cdbbcc2e72d78b.tar.xz | |
crypto: caam - Check for CAAM block presence before registering with crypto layer
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>
Diffstat (limited to 'drivers/crypto/caam/caamrng.c')
| -rw-r--r-- | drivers/crypto/caam/caamrng.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/drivers/crypto/caam/caamrng.c b/drivers/crypto/caam/caamrng.c index 8c07d31..a4afa8a 100644 --- a/drivers/crypto/caam/caamrng.c +++ b/drivers/crypto/caam/caamrng.c @@ -278,6 +278,34 @@ static void __exit caam_rng_exit(void) static int __init caam_rng_init(void) { struct device *dev; + struct device_node *dev_node; + struct platform_device *pdev; + struct device *ctrldev; + void *priv; + + 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; dev = caam_jr_alloc(); if (IS_ERR(dev)) { |