[PATCH v2 02/10] crypto: marvell: Check engine is not already running when enabling a req

[Boris Brezillon]

On Fri, 17 Jun 2016 13:24:01 +0200
Romain Perier <romain.perier at free-electrons.com> wrote:

> Add a BUG_ON() call when the driver tries to launch a crypto request
> while the engine is still processing the previous one. This replaces
> a silent system hang by a verbose kernel panic with the associated
> backtrace to let the user know that something went wrong in the CESA
> driver.
> 
> Signed-off-by: Romain Perier <romain.perier at free-electrons.com>

Acked-by: Boris Brezillon <boris.brezillon at free-electrons.com>

> ---
> 
> Changes in v2:
>   - Reworded the commit message
>   - Fixed cosmetic changes
> 
>  drivers/crypto/marvell/cipher.c | 2 ++
>  drivers/crypto/marvell/hash.c   | 2 ++
>  drivers/crypto/marvell/tdma.c   | 2 ++
>  3 files changed, 6 insertions(+)
> 
> diff --git a/drivers/crypto/marvell/cipher.c
> b/drivers/crypto/marvell/cipher.c index dcf1fce..ec23609 100644
> --- a/drivers/crypto/marvell/cipher.c
> +++ b/drivers/crypto/marvell/cipher.c
> @@ -106,6 +106,8 @@ static void mv_cesa_ablkcipher_std_step(struct
> ablkcipher_request *req) 
>  	mv_cesa_set_int_mask(engine, CESA_SA_INT_ACCEL0_DONE);
>  	writel_relaxed(CESA_SA_CFG_PARA_DIS, engine->regs +
> CESA_SA_CFG);
> +	BUG_ON(readl(engine->regs + CESA_SA_CMD) &
> +		     CESA_SA_CMD_EN_CESA_SA_ACCL0);

Still incorrectly aligned ;).

>  	writel(CESA_SA_CMD_EN_CESA_SA_ACCL0, engine->regs +
> CESA_SA_CMD); }
>  
> diff --git a/drivers/crypto/marvell/hash.c
> b/drivers/crypto/marvell/hash.c index 7ca2e0f..80bddd7 100644
> --- a/drivers/crypto/marvell/hash.c
> +++ b/drivers/crypto/marvell/hash.c
> @@ -237,6 +237,8 @@ static void mv_cesa_ahash_std_step(struct
> ahash_request *req) 
>  	mv_cesa_set_int_mask(engine, CESA_SA_INT_ACCEL0_DONE);
>  	writel_relaxed(CESA_SA_CFG_PARA_DIS, engine->regs +
> CESA_SA_CFG);
> +	BUG_ON(readl(engine->regs + CESA_SA_CMD) &
> +	       CESA_SA_CMD_EN_CESA_SA_ACCL0);
>  	writel(CESA_SA_CMD_EN_CESA_SA_ACCL0, engine->regs +
> CESA_SA_CMD); }
>  
> diff --git a/drivers/crypto/marvell/tdma.c
> b/drivers/crypto/marvell/tdma.c index 7642798..8c86bb6 100644
> --- a/drivers/crypto/marvell/tdma.c
> +++ b/drivers/crypto/marvell/tdma.c
> @@ -53,6 +53,8 @@ void mv_cesa_dma_step(struct mv_cesa_tdma_req *dreq)
>  		       engine->regs + CESA_SA_CFG);
>  	writel_relaxed(dreq->chain.first->cur_dma,
>  		       engine->regs + CESA_TDMA_NEXT_ADDR);
> +	BUG_ON(readl(engine->regs + CESA_SA_CMD) &
> +	       CESA_SA_CMD_EN_CESA_SA_ACCL0);
>  	writel(CESA_SA_CMD_EN_CESA_SA_ACCL0, engine->regs +
> CESA_SA_CMD); }
>