linux-kernel - [PATCH] crypto: sa2ul

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Date:   Mon, 22 Nov 2021 16:54:02 +0100
From:   Geert Uytterhoeven <geert+renesas@...der.be>
To:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S . Miller" <davem@...emloft.net>
Cc:     linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH] crypto: sa2ul - Use bitfield helpers

Use the FIELD_PREP() helper, instead of open-coding the same operation.

Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
---
Compile-tested only.

See "[PATCH 00/17] Non-const bitfield helper conversions"
(https://lore.kernel.org/r/cover.1637592133.git.geert+renesas@glider.be)
for background and more conversions.
---
 drivers/crypto/sa2ul.c | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/drivers/crypto/sa2ul.c b/drivers/crypto/sa2ul.c
index bcbc38dc6ae8fa6b..51b58e57153f61d2 100644
--- a/drivers/crypto/sa2ul.c
+++ b/drivers/crypto/sa2ul.c
@@ -8,6 +8,7 @@
  *		Vitaly Andrianov
  *		Tero Kristo
  */
+#include <linux/bitfield.h>
 #include <linux/clk.h>
 #include <linux/dma-mapping.h>
 #include <linux/dmaengine.h>
@@ -646,8 +647,8 @@ static inline void sa_update_cmdl(struct sa_req *req, u32 *cmdl,
 		cmdl[upd_info->enc_offset.index] &=
 						~SA_CMDL_SOP_BYPASS_LEN_MASK;
 		cmdl[upd_info->enc_offset.index] |=
-			((u32)req->enc_offset <<
-			 __ffs(SA_CMDL_SOP_BYPASS_LEN_MASK));
+			FIELD_PREP(SA_CMDL_SOP_BYPASS_LEN_MASK,
+				   req->enc_offset);
 
 		if (likely(upd_info->flags & SA_CMDL_UPD_ENC_IV)) {
 			__be32 *data = (__be32 *)&cmdl[upd_info->enc_iv.index];
@@ -666,8 +667,8 @@ static inline void sa_update_cmdl(struct sa_req *req, u32 *cmdl,
 		cmdl[upd_info->auth_offset.index] &=
 			~SA_CMDL_SOP_BYPASS_LEN_MASK;
 		cmdl[upd_info->auth_offset.index] |=
-			((u32)req->auth_offset <<
-			 __ffs(SA_CMDL_SOP_BYPASS_LEN_MASK));
+			FIELD_PREP(SA_CMDL_SOP_BYPASS_LEN_MASK,
+				   req->auth_offset);
 		if (upd_info->flags & SA_CMDL_UPD_AUTH_IV) {
 			sa_copy_iv((void *)&cmdl[upd_info->auth_iv.index],
 				   req->auth_iv,
@@ -689,16 +690,16 @@ void sa_set_swinfo(u8 eng_id, u16 sc_id, dma_addr_t sc_phys,
 		   u8 hash_size, u32 *swinfo)
 {
 	swinfo[0] = sc_id;
-	swinfo[0] |= (flags << __ffs(SA_SW0_FLAGS_MASK));
+	swinfo[0] |= FIELD_PREP(SA_SW0_FLAGS_MASK, flags);
 	if (likely(cmdl_present))
-		swinfo[0] |= ((cmdl_offset | SA_SW0_CMDL_PRESENT) <<
-						__ffs(SA_SW0_CMDL_INFO_MASK));
-	swinfo[0] |= (eng_id << __ffs(SA_SW0_ENG_ID_MASK));
+		swinfo[0] |= FIELD_PREP(SA_SW0_CMDL_INFO_MASK,
+					cmdl_offset | SA_SW0_CMDL_PRESENT);
+	swinfo[0] |= FIELD_PREP(SA_SW0_ENG_ID_MASK, eng_id);
 
 	swinfo[0] |= SA_SW0_DEST_INFO_PRESENT;
 	swinfo[1] = (u32)(sc_phys & 0xFFFFFFFFULL);
 	swinfo[2] = (u32)((sc_phys & 0xFFFFFFFF00000000ULL) >> 32);
-	swinfo[2] |= (hash_size << __ffs(SA_SW2_EGRESS_LENGTH));
+	swinfo[2] |= FIELD_PREP(SA_SW2_EGRESS_LENGTH, hash_size);
 }
 
 /* Dump the security context */
-- 
2.25.1