mtd: nand: omap: fix error-codes returned from omap-elm driver

This patch
 omap-elm.c: replaces -ve integer value returned during errorneous condition,
             with proper error-codes.
 omap-gpmc.c: updates omap-gpmc driver to pass error-codes returned from
             omap-elm driver to upper layers

Signed-off-by: Pekon Gupta <pekon@ti.com>
Reviewed-by: Stefan Roese <sr@denx.de>

drivers/mtd/nand/omap_elm.c

@@ -19,6 +19,7 @@
 #include <linux/mtd/omap_elm.h>
 #include <asm/arch/hardware.h>
 
+#define DRIVER_NAME		"omap-elm"
 #define ELM_DEFAULT_POLY (0)
 
 struct elm *elm_cfg;
@@ -113,8 +114,10 @@ int elm_check_error(u8 *syndrome, enum bch_level bch_type, u32 *error_count,
 
 	/* check if correctable */
 	location_status = readl(&elm_cfg->error_location[poly].location_status);
-	if (!(location_status & ELM_LOCATION_STATUS_ECC_CORRECTABLE_MASK))
-		return -1;
+	if (!(location_status & ELM_LOCATION_STATUS_ECC_CORRECTABLE_MASK)) {
+		printf("%s: uncorrectable ECC errors\n", DRIVER_NAME);
+		return -EBADMSG;
+	}
 
 	/* get error count */
 	*error_count = readl(&elm_cfg->error_location[poly].location_status) &

drivers/mtd/nand/omap_gpmc.c

@@ -370,10 +370,10 @@ static int omap_correct_data_bch(struct mtd_info *mtd, uint8_t *dat,
 	}
 	/* use elm module to check for errors */
 	elm_config(bch_type);
-	if (elm_check_error(calc_ecc, bch_type, &error_count, error_loc)) {
-		printf("nand: error: uncorrectable ECC errors\n");
-		return -EINVAL;
-	}
+	err = elm_check_error(calc_ecc, bch_type, &error_count, error_loc);
+	if (err)
+		return err;
+
 	/* correct bch error */
 	for (count = 0; count < error_count; count++) {
 		switch (info->ecc_scheme) {