[PATCH 4.6 019/100] crypto: sun4i-ss - Replace spinlock_bh by spin_lock_irq{save|restore}

Greg Kroah-Hartman
2016-05-30T21:44:06Z

From: Corentin LABBE <clabbe.montjoie@gmail.com>

commit bdb6cf9f6fe6d9af905ea34b7c4bb78ea601329e upstream.

The current sun4i-ss driver could generate data corruption when ciphering/deciphering.
It occurs randomly on end of handled data.
No root cause have been found and the only way to remove it is to replace
all spin_lock_bh by their irq counterparts.

Fixes: 6298e948215f ("crypto: sunxi-ss - Add Allwinner Security System crypto accelerator")
Signed-off-by: LABBE Corentin <clabbe.montjoie@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/crypto/sunxi-ss/sun4i-ss-cipher.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)

--- a/drivers/crypto/sunxi-ss/sun4i-ss-cipher.c
+++ b/drivers/crypto/sunxi-ss/sun4i-ss-cipher.c
@@ -35,6 +35,7 @@ static int sun4i_ss_opti_poll(struct abl
unsigned int todo;
struct sg_mapping_iter mi, mo;
unsigned int oi, oo; /* offset for in and out */
+ unsigned long flags;

if (areq->nbytes == 0)
return 0;
@@ -49,7 +50,7 @@ static int sun4i_ss_opti_poll(struct abl
return -EINVAL;
}

- spin_lock_bh(&ss->slock);
+ spin_lock_irqsave(&ss->slock, flags);

for (i = 0; i < op->keylen; i += 4)
writel(*(op->key + i / 4), ss->base + SS_KEY0 + i);
@@ -117,7 +118,7 @@ release_ss:
sg_miter_stop(&mi);
sg_miter_stop(&mo);
writel(0, ss->base + SS_CTL);
- spin_unlock_bh(&ss->slock);
+ spin_unlock_irqrestore(&ss->slock, flags);
return err;
}

@@ -149,6 +150,7 @@ static int sun4i_ss_cipher_poll(struct a
unsigned int ob = 0; /* offset in buf */
unsigned int obo = 0; /* offset in bufo*/
unsigned int obl = 0; /* length of data in bufo */
+ unsigned long flags;

if (areq->nbytes == 0)
return 0;
@@ -181,7 +183,7 @@ static int sun4i_ss_cipher_poll(struct a
if (no_chunk == 1)
return sun4i_ss_opti_poll(areq);

- spin_lock_bh(&ss->slock);
+ spin_lock_irqsave(&ss->slock, flags);

for (i = 0; i < op->keylen; i += 4)
writel(*(op->key + i / 4), ss->base + SS_KEY0 + i);
@@ -307,7 +309,7 @@ release_ss:
sg_miter_stop(&mi);
sg_miter_stop(&mo);
writel(0, ss->base + SS_CTL);
- spin_unlock_bh(&ss->slock);
+ spin_unlock_irqrestore(&ss->slock, flags);

return err;
}