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-rw-r--r--fs/pstore/ram_core.c16
1 files changed, 8 insertions, 8 deletions
diff --git a/fs/pstore/ram_core.c b/fs/pstore/ram_core.c
index f62ebf2dfed..a5a7b13d358 100644
--- a/fs/pstore/ram_core.c
+++ b/fs/pstore/ram_core.c
@@ -171,12 +171,12 @@ static void persistent_ram_ecc_old(struct persistent_ram_zone *prz)
}
}
-static int persistent_ram_init_ecc(struct persistent_ram_zone *prz,
- size_t buffer_size)
+static int persistent_ram_init_ecc(struct persistent_ram_zone *prz)
{
int numerr;
struct persistent_ram_buffer *buffer = prz->buffer;
int ecc_blocks;
+ size_t ecc_total;
if (!prz->ecc)
return 0;
@@ -187,14 +187,14 @@ static int persistent_ram_init_ecc(struct persistent_ram_zone *prz,
prz->ecc_poly = 0x11d;
ecc_blocks = DIV_ROUND_UP(prz->buffer_size, prz->ecc_block_size);
- prz->buffer_size -= (ecc_blocks + 1) * prz->ecc_size;
-
- if (prz->buffer_size > buffer_size) {
- pr_err("persistent_ram: invalid size %zu, non-ecc datasize %zu\n",
- buffer_size, prz->buffer_size);
+ ecc_total = (ecc_blocks + 1) * prz->ecc_size;
+ if (ecc_total >= prz->buffer_size) {
+ pr_err("%s: invalid ecc_size %u (total %zu, buffer size %zu)\n",
+ __func__, prz->ecc_size, ecc_total, prz->buffer_size);
return -EINVAL;
}
+ prz->buffer_size -= ecc_total;
prz->par_buffer = buffer->data + prz->buffer_size;
prz->par_header = prz->par_buffer + ecc_blocks * prz->ecc_size;
@@ -397,7 +397,7 @@ static int __devinit persistent_ram_post_init(struct persistent_ram_zone *prz,
prz->ecc = ecc;
- ret = persistent_ram_init_ecc(prz, prz->buffer_size);
+ ret = persistent_ram_init_ecc(prz);
if (ret)
return ret;