crypto: caam - Dynamic memory allocation for caam_rng_ctx object

This patch allocates memory from DMAable region to the caam_rng_ctx object,
earlier it had been statically allocated which resulted in errorneous
behaviour on inserting the caamrng module at the runtime.

Signed-off-by: Nitesh Lal <NiteshNarayanLal@freescale.com>
Acked-by: Ruchika Gupta <ruchika.gupta@freescale.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 9 insertions, 6 deletions

diff --git a/drivers/crypto/caam/caamrng.c b/drivers/crypto/caam/caamrng.c
index 28486b19fc36..403d8d599b5f 100644
--- a/drivers/crypto/caam/caamrng.c
+++ b/drivers/crypto/caam/caamrng.c
@@ -76,7 +76,7 @@ struct caam_rng_ctx {
         struct buf_data bufs[2];
 };
 
-static struct caam_rng_ctx rng_ctx;
+static struct caam_rng_ctx *rng_ctx;
 
 static inline void rng_unmap_buf(struct device *jrdev, struct buf_data *bd)
 {
@@ -137,7 +137,7 @@ static inline int submit_job(struct caam_rng_ctx *ctx, int to_current)
 
 static int caam_read(struct hwrng *rng, void *data, size_t max, bool wait)
 {
-        struct caam_rng_ctx *ctx = &rng_ctx;
+        struct caam_rng_ctx *ctx = rng_ctx;
         struct buf_data *bd = &ctx->bufs[ctx->current_buf];
         int next_buf_idx, copied_idx;
         int err;
@@ -237,12 +237,12 @@ static void caam_cleanup(struct hwrng *rng)
         struct buf_data *bd;
 
         for (i = 0; i < 2; i++) {
-                bd = &rng_ctx.bufs[i];
+                bd = &rng_ctx->bufs[i];
                 if (atomic_read(&bd->empty) == BUF_PENDING)
                         wait_for_completion(&bd->filled);
         }
 
-        rng_unmap_ctx(&rng_ctx);
+        rng_unmap_ctx(rng_ctx);
 }
 
 static void caam_init_buf(struct caam_rng_ctx *ctx, int buf_id)
@@ -273,8 +273,9 @@ static struct hwrng caam_rng = {
 
 static void __exit caam_rng_exit(void)
 {
-        caam_jr_free(rng_ctx.jrdev);
+        caam_jr_free(rng_ctx->jrdev);
         hwrng_unregister(&caam_rng);
+        kfree(rng_ctx);
 }
 
 static int __init caam_rng_init(void)
@@ -286,7 +287,9 @@ static int __init caam_rng_init(void)
                 pr_err("Job Ring Device allocation for transform failed\n");
                 return PTR_ERR(dev);
         }
-
+        rng_ctx = kmalloc(sizeof(struct caam_rng_ctx), GFP_DMA);
+        if (!rng_ctx)
+                return -ENOMEM;
         caam_init_rng(&rng_ctx, dev);
 
         dev_info(dev, "registering rng-caam\n");