crypto: spacc - Fix counter width checks

This patch fixes counter width checks according to the version extension3
register. The counter widths can be 8, 16, 32 and 64 bits as per the
extension3 register.

Signed-off-by: Bhoomika K <[email protected]>
Signed-off-by: Pavitrakumar M <[email protected]>
Acked-by: Ruud Derwig <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>

Author: Pavitrakumar M

drivers/crypto/dwc-spacc/spacc_skcipher.c

@@ -408,40 +408,42 @@ static int spacc_cipher_process(struct skcipher_request *req, int enc_dec)
 		for (i = 0; i < 16; i++)
 			ivc1[i] = req->iv[i];
 
-		/* 32-bit counter width */
-		if (readl(device_h->regmap + SPACC_REG_VERSION_EXT_3) & (0x2)) {
+		/* 64-bit counter width */
+		if (readl(device_h->regmap + SPACC_REG_VERSION_EXT_3) & (0x3)) {
 
-			for (i = 12; i < 16; i++) {
-				num_iv <<= 8;
-				num_iv |= ivc1[i];
+			for (i = 8; i < 16; i++) {
+				num_iv64 <<= 8;
+				num_iv64 |= ivc1[i];
 			}
 
-			diff = SPACC_CTR_IV_MAX32 - num_iv;
+			diff64 = SPACC_CTR_IV_MAX64 - num_iv64;
 
-			if (len > diff) {
+			if (len > diff64) {
 				name = salg->calg->cra_name;
 				ret = spacc_skcipher_fallback(name,
 							      req, enc_dec);
 				return ret;
 			}
+		/* 32-bit counter width */
 		} else if (readl(device_h->regmap + SPACC_REG_VERSION_EXT_3)
-			  & (0x3)) { /* 64-bit counter width */
+			& (0x2)) {
 
-			for (i = 8; i < 16; i++) {
-				num_iv64 <<= 8;
-				num_iv64 |= ivc1[i];
+			for (i = 12; i < 16; i++) {
+				num_iv <<= 8;
+				num_iv |= ivc1[i];
 			}
 
-			diff64 = SPACC_CTR_IV_MAX64 - num_iv64;
+			diff = SPACC_CTR_IV_MAX32 - num_iv;
 
-			if (len > diff64) {
+			if (len > diff) {
 				name = salg->calg->cra_name;
 				ret = spacc_skcipher_fallback(name,
 							      req, enc_dec);
 				return ret;
 			}
+		/* 16-bit counter width */
 		} else if (readl(device_h->regmap + SPACC_REG_VERSION_EXT_3)
-			   & (0x1)) { /* 16-bit counter width */
+			   & (0x1)) {
 
 			for (i = 14; i < 16; i++) {
 				num_iv <<= 8;
@@ -456,8 +458,9 @@ static int spacc_cipher_process(struct skcipher_request *req, int enc_dec)
 							      req, enc_dec);
 				return ret;
 			}
-		} else if (readl(device_h->regmap + SPACC_REG_VERSION_EXT_3)
-			   & (0x0)) { /* 8-bit counter width */
+		/* 8-bit counter width */
+		} else if ((readl(device_h->regmap + SPACC_REG_VERSION_EXT_3)
+			    & 0x7) == 0) {
 
 			for (i = 15; i < 16; i++) {
 				num_iv <<= 8;