crypto: stm32/cryp - remove request mutex protection

Mutex is badly used between threaded irq and driver.
This mutex must be removed as the framework must ensure
that requests must be serialized to avoid issue. Rework
req to avoid crash during finalize by fixing the NULL
pointer issue.

Signed-off-by: Lionel Debieve <lionel.debieve@st.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/drivers/crypto/stm32/stm32-cryp.c b/drivers/crypto/stm32/stm32-cryp.c
index cfcb640c20d00a98f33ec486f01a692e4e443dbe..eb525669d4eb9ebf3c479b0447988bffe3db568b 100644 (file)
--- a/drivers/crypto/stm32/stm32-cryp.c
+++ b/drivers/crypto/stm32/stm32-cryp.c
@@ -137,7 +137,6 @@ struct stm32_cryp {
 
        struct crypto_engine    *engine;
 
-       struct mutex            lock; /* protects req / areq */
        struct ablkcipher_request *req;
        struct aead_request     *areq;
 
@@ -645,18 +644,13 @@ static void stm32_cryp_finish_req(struct stm32_cryp *cryp, int err)
        pm_runtime_mark_last_busy(cryp->dev);
        pm_runtime_put_autosuspend(cryp->dev);
 
-       if (is_gcm(cryp) || is_ccm(cryp)) {
+       if (is_gcm(cryp) || is_ccm(cryp))
                crypto_finalize_aead_request(cryp->engine, cryp->areq, err);
-               cryp->areq = NULL;
-       } else {
+       else
                crypto_finalize_ablkcipher_request(cryp->engine, cryp->req,
                                                   err);
-               cryp->req = NULL;
-       }
 
        memset(cryp->ctx->key, 0, cryp->ctx->keylen);
-
-       mutex_unlock(&cryp->lock);
 }
 
 static int stm32_cryp_cpu_start(struct stm32_cryp *cryp)
@@ -933,8 +927,6 @@ static int stm32_cryp_prepare_req(struct ablkcipher_request *req,
        if (!cryp)
                return -ENODEV;
 
-       mutex_lock(&cryp->lock);
-
        rctx = req ? ablkcipher_request_ctx(req) : aead_request_ctx(areq);
        rctx->mode &= FLG_MODE_MASK;
 
@@ -946,6 +938,7 @@ static int stm32_cryp_prepare_req(struct ablkcipher_request *req,
 
        if (req) {
                cryp->req = req;
+               cryp->areq = NULL;
                cryp->total_in = req->nbytes;
                cryp->total_out = cryp->total_in;
        } else {
@@ -971,6 +964,7 @@ static int stm32_cryp_prepare_req(struct ablkcipher_request *req,
                 *          <---------- total_out ----------------->
                 */
                cryp->areq = areq;
+               cryp->req = NULL;
                cryp->authsize = crypto_aead_authsize(crypto_aead_reqtfm(areq));
                cryp->total_in = areq->assoclen + areq->cryptlen;
                if (is_encrypt(cryp))
@@ -992,19 +986,19 @@ static int stm32_cryp_prepare_req(struct ablkcipher_request *req,
        if (cryp->in_sg_len < 0) {
                dev_err(cryp->dev, "Cannot get in_sg_len\n");
                ret = cryp->in_sg_len;
-               goto out;
+               return ret;
        }
 
        cryp->out_sg_len = sg_nents_for_len(cryp->out_sg, cryp->total_out);
        if (cryp->out_sg_len < 0) {
                dev_err(cryp->dev, "Cannot get out_sg_len\n");
                ret = cryp->out_sg_len;
-               goto out;
+               return ret;
        }
 
        ret = stm32_cryp_copy_sgs(cryp);
        if (ret)
-               goto out;
+               return ret;
 
        scatterwalk_start(&cryp->in_walk, cryp->in_sg);
        scatterwalk_start(&cryp->out_walk, cryp->out_sg);
@@ -1016,10 +1010,6 @@ static int stm32_cryp_prepare_req(struct ablkcipher_request *req,
        }
 
        ret = stm32_cryp_hw_init(cryp);
-out:
-       if (ret)
-               mutex_unlock(&cryp->lock);
-
        return ret;
 }
 
@@ -1959,8 +1949,6 @@ static int stm32_cryp_probe(struct platform_device *pdev)
 
        cryp->dev = dev;
 
-       mutex_init(&cryp->lock);
-
        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        cryp->regs = devm_ioremap_resource(dev, res);
        if (IS_ERR(cryp->regs))