From f62830886f6b8cb2f1c55e23cb5eab51c4b9ef2c Mon Sep 17 00:00:00 2001 From: Romain Perier <romain.perier@free-electrons.com> Date: Tue, 21 Jun 2016 10:08:32 +0200 Subject: [PATCH] crypto: marvell - Check engine is not already running when enabling a req 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@free-electrons.com> Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> --- 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 dcf1fceb93364..8c1432e443388 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); 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 7a5058da91517..204c29358a7d3 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 0ad8f1ecf1759..e416a7455d281 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); } -- 2.30.2