summaryrefslogtreecommitdiffstats
path: root/lib/bch.c
diff options
context:
space:
mode:
Diffstat (limited to 'lib/bch.c')
-rw-r--r--lib/bch.c23
1 files changed, 15 insertions, 8 deletions
diff --git a/lib/bch.c b/lib/bch.c
index bc89dfe4d1b3..7b0f2006698b 100644
--- a/lib/bch.c
+++ b/lib/bch.c
@@ -78,15 +78,22 @@
#define GF_M(_p) (CONFIG_BCH_CONST_M)
#define GF_T(_p) (CONFIG_BCH_CONST_T)
#define GF_N(_p) ((1 << (CONFIG_BCH_CONST_M))-1)
+#define BCH_MAX_M (CONFIG_BCH_CONST_M)
#else
#define GF_M(_p) ((_p)->m)
#define GF_T(_p) ((_p)->t)
#define GF_N(_p) ((_p)->n)
+#define BCH_MAX_M 15
#endif
+#define BCH_MAX_T (((1 << BCH_MAX_M) - 1) / BCH_MAX_M)
+
#define BCH_ECC_WORDS(_p) DIV_ROUND_UP(GF_M(_p)*GF_T(_p), 32)
#define BCH_ECC_BYTES(_p) DIV_ROUND_UP(GF_M(_p)*GF_T(_p), 8)
+#define BCH_ECC_MAX_WORDS DIV_ROUND_UP(BCH_MAX_M * BCH_MAX_T, 32)
+#define BCH_ECC_MAX_BYTES DIV_ROUND_UP(BCH_MAX_M * BCH_MAX_T, 8)
+
#ifndef dbg
#define dbg(_fmt, args...) do {} while (0)
#endif
@@ -187,7 +194,8 @@ void encode_bch(struct bch_control *bch, const uint8_t *data,
const unsigned int l = BCH_ECC_WORDS(bch)-1;
unsigned int i, mlen;
unsigned long m;
- uint32_t w, r[l+1];
+ uint32_t w, r[BCH_ECC_MAX_WORDS];
+ const size_t r_bytes = BCH_ECC_WORDS(bch) * sizeof(*r);
const uint32_t * const tab0 = bch->mod8_tab;
const uint32_t * const tab1 = tab0 + 256*(l+1);
const uint32_t * const tab2 = tab1 + 256*(l+1);
@@ -198,7 +206,7 @@ void encode_bch(struct bch_control *bch, const uint8_t *data,
/* load ecc parity bytes into internal 32-bit buffer */
load_ecc8(bch, bch->ecc_buf, ecc);
} else {
- memset(bch->ecc_buf, 0, sizeof(r));
+ memset(bch->ecc_buf, 0, r_bytes);
}
/* process first unaligned data bytes */
@@ -215,7 +223,7 @@ void encode_bch(struct bch_control *bch, const uint8_t *data,
mlen = len/4;
data += 4*mlen;
len -= 4*mlen;
- memcpy(r, bch->ecc_buf, sizeof(r));
+ memcpy(r, bch->ecc_buf, r_bytes);
/*
* split each 32-bit word into 4 polynomials of weight 8 as follows:
@@ -241,7 +249,7 @@ void encode_bch(struct bch_control *bch, const uint8_t *data,
r[l] = p0[l]^p1[l]^p2[l]^p3[l];
}
- memcpy(bch->ecc_buf, r, sizeof(r));
+ memcpy(bch->ecc_buf, r, r_bytes);
/* process last unaligned bytes */
if (len)
@@ -434,7 +442,7 @@ static int solve_linear_system(struct bch_control *bch, unsigned int *rows,
{
const int m = GF_M(bch);
unsigned int tmp, mask;
- int rem, c, r, p, k, param[m];
+ int rem, c, r, p, k, param[BCH_MAX_M];
k = 0;
mask = 1 << m;
@@ -1114,7 +1122,7 @@ static int build_deg2_base(struct bch_control *bch)
{
const int m = GF_M(bch);
int i, j, r;
- unsigned int sum, x, y, remaining, ak = 0, xi[m];
+ unsigned int sum, x, y, remaining, ak = 0, xi[BCH_MAX_M];
/* find k s.t. Tr(a^k) = 1 and 0 <= k < m */
for (i = 0; i < m; i++) {
@@ -1254,7 +1262,6 @@ struct bch_control *init_bch(int m, int t, unsigned int prim_poly)
struct bch_control *bch = NULL;
const int min_m = 5;
- const int max_m = 15;
/* default primitive polynomials */
static const unsigned int prim_poly_tab[] = {
@@ -1270,7 +1277,7 @@ struct bch_control *init_bch(int m, int t, unsigned int prim_poly)
goto fail;
}
#endif
- if ((m < min_m) || (m > max_m))
+ if ((m < min_m) || (m > BCH_MAX_M))
/*
* values of m greater than 15 are not currently supported;
* supporting m > 15 would require changing table base type