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| author | Horia Geantă <horia.geanta@nxp.com> | 2018-02-05 11:15:52 +0200 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2018-02-08 22:38:13 +1100 |
| commit | 225ece3e7dad4cfc44cca38ce7a3a80f255ea8f1 (patch) | |
| tree | 90c6a304a1698b5e9ee8e644d3c62c7df22a4355 /drivers/crypto/caam | |
| parent | ba916b6a0339ed6cc6441ad83c097ab795dbdbc5 (diff) | |
| download | linux-225ece3e7dad4cfc44cca38ce7a3a80f255ea8f1.tar.gz linux-225ece3e7dad4cfc44cca38ce7a3a80f255ea8f1.tar.bz2 linux-225ece3e7dad4cfc44cca38ce7a3a80f255ea8f1.zip | |
crypto: caam - fix endless loop when DECO acquire fails
In case DECO0 cannot be acquired - i.e. run_descriptor_deco0() fails
with -ENODEV, caam_probe() enters an endless loop:
run_descriptor_deco0
ret -ENODEV
-> instantiate_rng
-ENODEV, overwritten by -EAGAIN
ret -EAGAIN
-> caam_probe
-EAGAIN results in endless loop
It turns out the error path in instantiate_rng() is incorrect,
the checks are done in the wrong order.
Cc: <stable@vger.kernel.org> # 3.13+
Fixes: 1005bccd7a4a6 ("crypto: caam - enable instantiation of all RNG4 state handles")
Reported-by: Bryan O'Donoghue <pure.logic@nexus-software.ie>
Suggested-by: Auer Lukas <lukas.auer@aisec.fraunhofer.de>
Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto/caam')
| -rw-r--r-- | drivers/crypto/caam/ctrl.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/crypto/caam/ctrl.c b/drivers/crypto/caam/ctrl.c index 75d280cb2dc0..e843cf410373 100644 --- a/drivers/crypto/caam/ctrl.c +++ b/drivers/crypto/caam/ctrl.c @@ -228,12 +228,16 @@ static int instantiate_rng(struct device *ctrldev, int state_handle_mask, * without any error (HW optimizations for later * CAAM eras), then try again. */ + if (ret) + break; + rdsta_val = rd_reg32(&ctrl->r4tst[0].rdsta) & RDSTA_IFMASK; if ((status && status != JRSTA_SSRC_JUMP_HALT_CC) || - !(rdsta_val & (1 << sh_idx))) + !(rdsta_val & (1 << sh_idx))) { ret = -EAGAIN; - if (ret) break; + } + dev_info(ctrldev, "Instantiated RNG4 SH%d\n", sh_idx); /* Clear the contents before recreating the descriptor */ memset(desc, 0x00, CAAM_CMD_SZ * 7); |