Pick commit 225ece3e7dad4cfc44cca38ce7a3a80f255ea8f1 from Linux
upstream.
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: <[email protected]> # 3.13+
Fixes: 1005bccd7a4a6 ("crypto: caam - enable instantiation of all RNG4
state handles")
Reported-by: Bryan O'Donoghue <[email protected]>
Suggested-by: Auer Lukas <[email protected]>
Signed-off-by: Horia Geantă <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>
Signed-off-by: Marcin Niestroj <[email protected]>
---
drivers/crypto/caam/ctrl.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/crypto/caam/ctrl.c b/drivers/crypto/caam/ctrl.c
index 0f9ad328e..681200594 100644
--- a/drivers/crypto/caam/ctrl.c
+++ b/drivers/crypto/caam/ctrl.c
@@ -202,12 +202,15 @@ static int instantiate_rng(struct device_d *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);
--
2.18.0
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