cmd: ubi: use void * for buf parameter in ubi_volume_read

Use void * to avoid explicit type casting as what ubi_volume_write has done
already.

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>

cmd/ubi.c

@@ -505,7 +505,7 @@ int ubi_volume_write(const char *volume, const void *buf, loff_t offset,
 	return ret;
 }
 
-int ubi_volume_read(const char *volume, char *buf, loff_t offset, size_t size)
+int ubi_volume_read(const char *volume, void *buf, loff_t offset, size_t size)
 {
 	int err, lnum, off, len, tbuf_size;
 	void *tbuf;
@@ -877,7 +877,7 @@ static int do_ubi(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 		}
 
 		if (argc == 3) {
-			return ubi_volume_read(argv[3], (char *)addr, 0, size);
+			return ubi_volume_read(argv[3], (void *)addr, 0, size);
 		}
 	}
 

env/ubi.c

@@ -132,14 +132,14 @@ static int env_ubi_load(void)
 		return -EIO;
 	}
 
-	read1_fail = ubi_volume_read(CONFIG_ENV_UBI_VOLUME, (void *)tmp_env1, 0,
+	read1_fail = ubi_volume_read(CONFIG_ENV_UBI_VOLUME, tmp_env1, 0,
 				     CONFIG_ENV_SIZE);
 	if (read1_fail)
 		printf("\n** Unable to read env from %s:%s **\n",
 		       CONFIG_ENV_UBI_PART, CONFIG_ENV_UBI_VOLUME);
 
 	read2_fail = ubi_volume_read(CONFIG_ENV_UBI_VOLUME_REDUND,
-				     (void *)tmp_env2, 0, CONFIG_ENV_SIZE);
+				     tmp_env2, 0, CONFIG_ENV_SIZE);
 	if (read2_fail)
 		printf("\n** Unable to read redundant env from %s:%s **\n",
 		       CONFIG_ENV_UBI_PART, CONFIG_ENV_UBI_VOLUME_REDUND);

include/ubi_uboot.h

@@ -50,7 +50,7 @@ void ubi_exit(void);
 int ubi_part(const char *part_name, const char *vid_header_offset);
 int ubi_volume_write(const char *volume, const void *buf, loff_t offset,
 		     size_t size);
-int ubi_volume_read(const char *volume, char *buf, loff_t offset, size_t size);
+int ubi_volume_read(const char *volume, void *buf, loff_t offset, size_t size);
 
 extern struct ubi_device *ubi_devices[];
 int cmd_ubifs_mount(char *vol_name);