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authorGilad Ben-Yossef <gilad@benyossef.com>2019-07-02 14:39:19 +0300
committerHerbert Xu <herbert@gondor.apana.org.au>2019-07-26 07:51:55 +0300
commit76a95bd8f9e10cade9c4c8df93b5c20ff45dc0f5 (patch)
treec1fdcfbaf2381eb10f311c8412b27b9444986ee7 /drivers
parente6e6600c001c3aa3760aeb83dbd4630063e926ee (diff)
downloadlinux-76a95bd8f9e10cade9c4c8df93b5c20ff45dc0f5.tar.xz
crypto: ccree - account for TEE not ready to report
When ccree driver runs it checks the state of the Trusted Execution Environment CryptoCell driver before proceeding. We did not account for cases where the TEE side is not ready or not available at all. Fix it by only considering TEE error state after sync with the TEE side driver. Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com> Fixes: ab8ec9658f5a ("crypto: ccree - add FIPS support") CC: stable@vger.kernel.org # v4.17+ Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/crypto/ccree/cc_fips.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/crypto/ccree/cc_fips.c b/drivers/crypto/ccree/cc_fips.c
index 5ad3ffb7acaa..040e09c0e1af 100644
--- a/drivers/crypto/ccree/cc_fips.c
+++ b/drivers/crypto/ccree/cc_fips.c
@@ -21,7 +21,13 @@ static bool cc_get_tee_fips_status(struct cc_drvdata *drvdata)
u32 reg;
reg = cc_ioread(drvdata, CC_REG(GPR_HOST));
- return (reg == (CC_FIPS_SYNC_TEE_STATUS | CC_FIPS_SYNC_MODULE_OK));
+ /* Did the TEE report status? */
+ if (reg & CC_FIPS_SYNC_TEE_STATUS)
+ /* Yes. Is it OK? */
+ return (reg & CC_FIPS_SYNC_MODULE_OK);
+
+ /* No. It's either not in use or will be reported later */
+ return true;
}
/*