This adds a function that given a pointer to a PEB number increases the
number until the corresponding PEB is good. It also checks for the PEB
number being inside the mtd device.
Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
---
drivers/mtd/peb.c | 27 +++++++++++++++++++++++++++
include/mtd/mtd-peb.h | 1 +
2 files changed, 28 insertions(+)
diff --git a/drivers/mtd/peb.c b/drivers/mtd/peb.c
index c35b63f2fd..388db7f587 100644
--- a/drivers/mtd/peb.c
+++ b/drivers/mtd/peb.c
@@ -129,6 +129,33 @@ int mtd_num_pebs(struct mtd_info *mtd)
return mtd_div_by_eb(mtd->size, mtd);
}
+/**
+ * mtd_skip_bad - skip bad blocks
+ * @mtd: mtd device
+ * @pnum: The number of the block
+ *
+ * This function skips bad blocks beginning from @pnum. Returns 0 for success and
+ * a negative error code otherwise. on successful exit @pnum points to the next
+ * good block.
+ */
+int mtd_skip_bad(struct mtd_info *mtd, int *pnum)
+{
+ if (*pnum < 0)
+ return -EINVAL;
+
+ while (1) {
+ loff_t offset = (uint64_t)mtd->erasesize * *pnum;
+
+ if (offset >= mtd->size)
+ return -ENOSPC;
+
+ if (!mtd_block_isbad(mtd, offset))
+ return 0;
+
+ *pnum = *pnum + 1;
+ }
+}
+
/**
* mtd_peb_mark_bad - mark a physical eraseblock as bad
* @mtd: mtd device
diff --git a/include/mtd/mtd-peb.h b/include/mtd/mtd-peb.h
index e4fd01df90..23f89d89a8 100644
--- a/include/mtd/mtd-peb.h
+++ b/include/mtd/mtd-peb.h
@@ -12,6 +12,7 @@ int mtd_peb_torture(struct mtd_info *mtd, int pnum);
int mtd_peb_erase(struct mtd_info *mtd, int pnum);
int mtd_peb_mark_bad(struct mtd_info *mtd, int pnum);
int mtd_peb_is_bad(struct mtd_info *mtd, int pnum);
+int mtd_skip_bad(struct mtd_info *mtd, int *pnum);
int mtd_peb_check_all_ff(struct mtd_info *mtd, int pnum, int offset, int len,
int warn);
int mtd_peb_verify(struct mtd_info *mtd, const void *buf, int pnum,
--
2.20.1
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