From 7a373fd74a8d1c4882e0236cc38345cec1393505 Mon Sep 17 00:00:00 2001 From: Romain Izard Date: Tue, 31 Oct 2017 16:25:24 +0100 Subject: [PATCH] crypto: atmel-aes - Reset the controller before each use When using the rfc4543(gcm(aes))) mode, the registers of the hardware engine are not empty after use. If the engine is not reset before its next use, the following results will be invalid. Always reset the hardware engine. Signed-off-by: Romain Izard Signed-off-by: Herbert Xu --- drivers/crypto/atmel-aes.c | 10 +++------- 1 file changed, 3 insertions(+), 7 deletions(-) diff --git a/drivers/crypto/atmel-aes.c b/drivers/crypto/atmel-aes.c index 3f7b0966163c..0b49b6e9869a 100644 --- a/drivers/crypto/atmel-aes.c +++ b/drivers/crypto/atmel-aes.c @@ -77,12 +77,11 @@ AES_FLAGS_ENCRYPT | \ AES_FLAGS_GTAGEN) -#define AES_FLAGS_INIT BIT(2) #define AES_FLAGS_BUSY BIT(3) #define AES_FLAGS_DUMP_REG BIT(4) #define AES_FLAGS_OWN_SHA BIT(5) -#define AES_FLAGS_PERSISTENT (AES_FLAGS_INIT | AES_FLAGS_BUSY) +#define AES_FLAGS_PERSISTENT AES_FLAGS_BUSY #define ATMEL_AES_QUEUE_LENGTH 50 @@ -451,11 +450,8 @@ static int atmel_aes_hw_init(struct atmel_aes_dev *dd) if (err) return err; - if (!(dd->flags & AES_FLAGS_INIT)) { - atmel_aes_write(dd, AES_CR, AES_CR_SWRST); - atmel_aes_write(dd, AES_MR, 0xE << AES_MR_CKEY_OFFSET); - dd->flags |= AES_FLAGS_INIT; - } + atmel_aes_write(dd, AES_CR, AES_CR_SWRST); + atmel_aes_write(dd, AES_MR, 0xE << AES_MR_CKEY_OFFSET); return 0; }