[PATCH] disk: dos: Infer MBR partition sector size from underlying drive sector size

[Marek Vasut]

Block devices with 4k sectors imply the MBR sectors are also 4k instead
of regular 512B. Avoid hard-coding the 512B sector size and isntead read
the current block device sector size from it, and if the sector size is
larger than 512B, use the block device sector size.

Signed-off-by: Marek Vasut <marek.vasut+renesas at mailbox.org>
---
Cc: Simon Glass <sjg at chromium.org>
---
 disk/part_dos.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/disk/part_dos.c b/disk/part_dos.c
index 56e61884def..1b81297d967 100644
--- a/disk/part_dos.c
+++ b/disk/part_dos.c
@@ -207,8 +207,9 @@ static int part_get_info_extended(struct blk_desc *dev_desc,
 				  struct disk_partition *info, uint disksig)
 {
 	ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
+	struct disk_partition wdinfo = { 0 };
 	dos_partition_t *pt;
-	int i;
+	int i, ret;
 	int dos_type;
 
 	/* set a maximum recursion level */
@@ -236,6 +237,10 @@ static int part_get_info_extended(struct blk_desc *dev_desc,
 		disksig = get_unaligned_le32(&buffer[DOS_PART_DISKSIG_OFFSET]);
 #endif
 
+	ret = part_get_info_whole_disk(dev_desc, &wdinfo);
+	if (ret)
+		return ret;
+
 	/* Print all primary/logical partitions */
 	pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
 	for (i = 0; i < 4; i++, pt++) {
@@ -247,7 +252,10 @@ static int part_get_info_extended(struct blk_desc *dev_desc,
 		    (pt->sys_ind != 0) &&
 		    (part_num == which_part) &&
 		    (ext_part_sector == 0 || is_extended(pt->sys_ind) == 0)) {
-			info->blksz = DOS_PART_DEFAULT_SECTOR;
+			if (wdinfo.blksz > DOS_PART_DEFAULT_SECTOR)
+				info->blksz = wdinfo.blksz;
+			else
+				info->blksz = DOS_PART_DEFAULT_SECTOR;
 			info->start = (lbaint_t)(ext_part_sector +
 					get_unaligned_le32(pt->start4));
 			info->size  = (lbaint_t)get_unaligned_le32(pt->size4);
@@ -289,7 +297,10 @@ static int part_get_info_extended(struct blk_desc *dev_desc,
 	if (dos_type == DOS_PBR) {
 		info->start = 0;
 		info->size = dev_desc->lba;
-		info->blksz = DOS_PART_DEFAULT_SECTOR;
+		if (wdinfo.blksz > DOS_PART_DEFAULT_SECTOR)
+			info->blksz = wdinfo.blksz;
+		else
+			info->blksz = DOS_PART_DEFAULT_SECTOR;
 		info->bootable = 0;
 		strcpy((char *)info->type, "U-Boot");
 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
-- 
2.40.1