diff options
| author | Haren Myneni <haren@linux.vnet.ibm.com> | 2015-12-13 14:30:41 +0300 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2015-12-17 11:42:12 +0300 |
| commit | 6333ed8f26cf77311088d2e2b7cf16d8480bcbb2 (patch) | |
| tree | f6b0d2fb24dc4b71d3aee51a16885c13488d7567 /drivers/crypto/nx | |
| parent | 81b312f11dfd7466462d94667f0a8df14a412d2a (diff) | |
| download | linux-6333ed8f26cf77311088d2e2b7cf16d8480bcbb2.tar.xz | |
crypto: nx-842 - Mask XERS0 bit in return value
NX842 coprocessor sets 3rd bit in CR register with XER[S0] which is
nothing to do with NX request. Since this bit can be set with other
valuable return status, mast this bit.
One of other bits (INITIATED, BUSY or REJECTED) will be returned for
any given NX request.
Signed-off-by: Haren Myneni <haren@us.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto/nx')
| -rw-r--r-- | drivers/crypto/nx/nx-842-powernv.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/drivers/crypto/nx/nx-842-powernv.c b/drivers/crypto/nx/nx-842-powernv.c index 87f7a0f1a3ec..1710f80a09ec 100644 --- a/drivers/crypto/nx/nx-842-powernv.c +++ b/drivers/crypto/nx/nx-842-powernv.c @@ -442,6 +442,14 @@ static int nx842_powernv_function(const unsigned char *in, unsigned int inlen, (unsigned int)ccw, (unsigned int)be32_to_cpu(crb->ccw)); + /* + * NX842 coprocessor sets 3rd bit in CR register with XER[S0]. + * XER[S0] is the integer summary overflow bit which is nothing + * to do NX. Since this bit can be set with other return values, + * mask this bit. + */ + ret &= ~ICSWX_XERS0; + switch (ret) { case ICSWX_INITIATED: ret = wait_for_csb(wmem, csb); @@ -454,10 +462,6 @@ static int nx842_powernv_function(const unsigned char *in, unsigned int inlen, pr_err_ratelimited("ICSWX rejected\n"); ret = -EPROTO; break; - default: - pr_err_ratelimited("Invalid ICSWX return code %x\n", ret); - ret = -EPROTO; - break; } if (!ret) |