[PATCH] crypto: fsl_hash: fix flush dcache alignment in caam_hash()

[blemouzy.ml at gmail.com]

From: Benjamin Lemouzy <blemouzy at centralp.fr>

Loading a FIT kernel image with hash hardware acceleration enabled
(CONFIG_SHA_HW_ACCEL=y) displays the following CACHE warning:

    [...]
    Trying 'kernel-1' kernel subimage
    [...]
    Verifying Hash Integrity ... sha256CACHE: Misaligned operation at
range [16000128, 1673fae8]
    [...]
    Trying 'ramdisk-1' ramdisk subimage
    [...]
    Verifying Hash Integrity ... sha256CACHE: Misaligned operation at
range [1676d6d4, 1737a5d4]
    [...]
    Trying 'fdt-imx6q-xxx.dtb' fdt subimage
    [...]
    Verifying Hash Integrity ... sha256CACHE: Misaligned operation at
range [1673fbdc, 1674b0dc]
    [...]

This patch fixes it.

Tested on:
- i.MX 6 custom board
- LS1021A custom board

Signed-off-by: Benjamin Lemouzy <blemouzy at centralp.fr>
---
 drivers/crypto/fsl/fsl_hash.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/crypto/fsl/fsl_hash.c b/drivers/crypto/fsl/fsl_hash.c
index 79b32e2627..b721c86609 100644
--- a/drivers/crypto/fsl/fsl_hash.c
+++ b/drivers/crypto/fsl/fsl_hash.c
@@ -183,6 +183,7 @@ int caam_hash(const unsigned char *pbuf, unsigned int buf_len,
 {
 	int ret = 0;
 	uint32_t *desc;
+	unsigned long pbuf_aligned;
 	unsigned int size;
 
 	desc = malloc_cache_aligned(sizeof(int) * MAX_CAAM_DESCSIZE);
@@ -191,8 +192,9 @@ int caam_hash(const unsigned char *pbuf, unsigned int buf_len,
 		return -ENOMEM;
 	}
 
-	size = ALIGN(buf_len, ARCH_DMA_MINALIGN);
-	flush_dcache_range((unsigned long)pbuf, (unsigned long)pbuf + size);
+	pbuf_aligned = ALIGN_DOWN((unsigned long)pbuf, ARCH_DMA_MINALIGN);
+	size = ALIGN(buf_len + ((unsigned long)pbuf - pbuf_aligned), ARCH_DMA_MINALIGN);
+	flush_dcache_range(pbuf_aligned, pbuf_aligned + size);
 
 	inline_cnstr_jobdesc_hash(desc, pbuf, buf_len, pout,
 				  driver_hash[algo].alg_type,
-- 
2.43.0