pstore/ram_core: Get rid of prz->ecc_symsize and prz->ecc_poly

The struct members were never used anywhere outside of
persistent_ram_init_ecc(), so there's actually no need for them
to be in the struct.

If we ever want to make polynomial or symbol size configurable,
it would make more sense to just pass initialized rs_decoder
to the persistent_ram init functions.

Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

fs/pstore/ram_core.c

@@ -177,14 +177,14 @@ static int persistent_ram_init_ecc(struct persistent_ram_zone *prz)
 	struct persistent_ram_buffer *buffer = prz->buffer;
 	int ecc_blocks;
 	size_t ecc_total;
+	int ecc_symsize = 8;
+	int ecc_poly = 0x11d;
 
 	if (!prz->ecc)
 		return 0;
 
 	prz->ecc_block_size = 128;
 	prz->ecc_size = 16;
-	prz->ecc_symsize = 8;
-	prz->ecc_poly = 0x11d;
 
 	ecc_blocks = DIV_ROUND_UP(prz->buffer_size, prz->ecc_block_size);
 	ecc_total = (ecc_blocks + 1) * prz->ecc_size;
@@ -202,8 +202,7 @@ static int persistent_ram_init_ecc(struct persistent_ram_zone *prz)
 	 * first consecutive root is 0
 	 * primitive element to generate roots = 1
 	 */
-	prz->rs_decoder = init_rs(prz->ecc_symsize, prz->ecc_poly, 0, 1,
-				  prz->ecc_size);
+	prz->rs_decoder = init_rs(ecc_symsize, ecc_poly, 0, 1, prz->ecc_size);
 	if (prz->rs_decoder == NULL) {
 		pr_info("persistent_ram: init_rs failed\n");
 		return -EINVAL;

include/linux/pstore_ram.h

@@ -41,8 +41,6 @@ struct persistent_ram_zone {
 	int bad_blocks;
 	int ecc_block_size;
 	int ecc_size;
-	int ecc_symsize;
-	int ecc_poly;
 
 	char *old_log;
 	size_t old_log_size;