UBI: simplify debugging return codes

UBI debugging functions were a little bit over-engineered and
returned more error codes than needed, and the callers had to
do useless checks. Simplify the return codes.

Impact: only debugging code is affected, which means that for
        non-developers this is a no-op patch.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

3 files changed, 37 insertions, 41 deletions

diff --git a/drivers/mtd/ubi/io.c b/drivers/mtd/ubi/io.c
index 8aa51e7a6a7d..a2501299a67c 100644
--- a/drivers/mtd/ubi/io.c
+++ b/drivers/mtd/ubi/io.c
@@ -143,7 +143,7 @@ int ubi_io_read(const struct ubi_device *ubi, void *buf, int pnum, int offset,
 
         err = paranoid_check_not_bad(ubi, pnum);
         if (err)
-                return err > 0 ? -EINVAL : err;
+                return err;
 
         addr = (loff_t)pnum * ubi->peb_size + offset;
 retry:
@@ -236,12 +236,12 @@ int ubi_io_write(struct ubi_device *ubi, const void *buf, int pnum, int offset,
 
         err = paranoid_check_not_bad(ubi, pnum);
         if (err)
-                return err > 0 ? -EINVAL : err;
+                return err;
 
         /* The area we are writing to has to contain all 0xFF bytes */
         err = ubi_dbg_check_all_ff(ubi, pnum, offset, len);
         if (err)
-                return err > 0 ? -EINVAL : err;
+                return err;
 
         if (offset >= ubi->leb_start) {
                 /*
@@ -250,10 +250,10 @@ int ubi_io_write(struct ubi_device *ubi, const void *buf, int pnum, int offset,
                  */
                 err = paranoid_check_peb_ec_hdr(ubi, pnum);
                 if (err)
-                        return err > 0 ? -EINVAL : err;
+                        return err;
                 err = paranoid_check_peb_vid_hdr(ubi, pnum);
                 if (err)
-                        return err > 0 ? -EINVAL : err;
+                        return err;
         }
 
         if (ubi_dbg_is_write_failure()) {
@@ -348,7 +348,7 @@ retry:
 
         err = ubi_dbg_check_all_ff(ubi, pnum, 0, ubi->peb_size);
         if (err)
-                return err > 0 ? -EINVAL : err;
+                return err;
 
         if (ubi_dbg_is_erase_failure() && !err) {
                 dbg_err("cannot erase PEB %d (emulated)", pnum);
@@ -542,7 +542,7 @@ int ubi_io_sync_erase(struct ubi_device *ubi, int pnum, int torture)
 
         err = paranoid_check_not_bad(ubi, pnum);
         if (err != 0)
-                return err > 0 ? -EINVAL : err;
+                return err;
 
         if (ubi->ro_mode) {
                 ubi_err("read-only mode");
@@ -819,7 +819,7 @@ int ubi_io_write_ec_hdr(struct ubi_device *ubi, int pnum,
 
         err = paranoid_check_ec_hdr(ubi, pnum, ec_hdr);
         if (err)
-                return -EINVAL;
+                return err;
 
         err = ubi_io_write(ubi, ec_hdr, pnum, 0, ubi->ec_hdr_alsize);
         return err;
@@ -1083,7 +1083,7 @@ int ubi_io_write_vid_hdr(struct ubi_device *ubi, int pnum,
 
         err = paranoid_check_peb_ec_hdr(ubi, pnum);
         if (err)
-                return err > 0 ? -EINVAL : err;
+                return err;
 
         vid_hdr->magic = cpu_to_be32(UBI_VID_HDR_MAGIC);
         vid_hdr->version = UBI_VERSION;
@@ -1092,7 +1092,7 @@ int ubi_io_write_vid_hdr(struct ubi_device *ubi, int pnum,
 
         err = paranoid_check_vid_hdr(ubi, pnum, vid_hdr);
         if (err)
-                return -EINVAL;
+                return err;
 
         p = (char *)vid_hdr - ubi->vid_hdr_shift;
         err = ubi_io_write(ubi, p, pnum, ubi->vid_hdr_aloffset,
@@ -1107,8 +1107,8 @@ int ubi_io_write_vid_hdr(struct ubi_device *ubi, int pnum,
  * @ubi: UBI device description object
  * @pnum: physical eraseblock number to check
  *
- * This function returns zero if the physical eraseblock is good, a positive
- * number if it is bad and a negative error code if an error occurred.
+ * This function returns zero if the physical eraseblock is good, %-EINVAL if
+ * it is bad and a negative error code if an error occurred.
  */
 static int paranoid_check_not_bad(const struct ubi_device *ubi, int pnum)
 {
@@ -1120,7 +1120,7 @@ static int paranoid_check_not_bad(const struct ubi_device *ubi, int pnum)
 
         ubi_err("paranoid check failed for PEB %d", pnum);
         ubi_dbg_dump_stack();
-        return err;
+        return err > 0 ? -EINVAL : err;
 }
 
 /**
@@ -1130,7 +1130,7 @@ static int paranoid_check_not_bad(const struct ubi_device *ubi, int pnum)
  * @ec_hdr: the erase counter header to check
  *
  * This function returns zero if the erase counter header contains valid
- * values, and %1 if not.
+ * values, and %-EINVAL if not.
  */
 static int paranoid_check_ec_hdr(const struct ubi_device *ubi, int pnum,
                                  const struct ubi_ec_hdr *ec_hdr)
@@ -1156,7 +1156,7 @@ static int paranoid_check_ec_hdr(const struct ubi_device *ubi, int pnum,
 fail:
         ubi_dbg_dump_ec_hdr(ec_hdr);
         ubi_dbg_dump_stack();
-        return 1;
+        return -EINVAL;
 }
 
 /**
@@ -1164,8 +1164,8 @@ fail:
  * @ubi: UBI device description object
  * @pnum: the physical eraseblock number to check
  *
- * This function returns zero if the erase counter header is all right, %1 if
- * not, and a negative error code if an error occurred.
+ * This function returns zero if the erase counter header is all right and and
+ * a negative error code if not or if an error occurred.
  */
 static int paranoid_check_peb_ec_hdr(const struct ubi_device *ubi, int pnum)
 {
@@ -1188,7 +1188,7 @@ static int paranoid_check_peb_ec_hdr(const struct ubi_device *ubi, int pnum)
                 ubi_err("paranoid check failed for PEB %d", pnum);
                 ubi_dbg_dump_ec_hdr(ec_hdr);
                 ubi_dbg_dump_stack();
-                err = 1;
+                err = -EINVAL;
                 goto exit;
         }
 
@@ -1206,7 +1206,7 @@ exit:
  * @vid_hdr: the volume identifier header to check
  *
  * This function returns zero if the volume identifier header is all right, and
- * %1 if not.
+ * %-EINVAL if not.
  */
 static int paranoid_check_vid_hdr(const struct ubi_device *ubi, int pnum,
                                   const struct ubi_vid_hdr *vid_hdr)
@@ -1233,7 +1233,7 @@ fail:
         ubi_err("paranoid check failed for PEB %d", pnum);
         ubi_dbg_dump_vid_hdr(vid_hdr);
         ubi_dbg_dump_stack();
-        return 1;
+        return -EINVAL;
 
 }
 
@@ -1243,7 +1243,7 @@ fail:
  * @pnum: the physical eraseblock number to check
  *
  * This function returns zero if the volume identifier header is all right,
- * %1 if not, and a negative error code if an error occurred.
+ * and a negative error code if not or if an error occurred.
  */
 static int paranoid_check_peb_vid_hdr(const struct ubi_device *ubi, int pnum)
 {
@@ -1270,7 +1270,7 @@ static int paranoid_check_peb_vid_hdr(const struct ubi_device *ubi, int pnum)
                 ubi_err("paranoid check failed for PEB %d", pnum);
                 ubi_dbg_dump_vid_hdr(vid_hdr);
                 ubi_dbg_dump_stack();
-                err = 1;
+                err = -EINVAL;
                 goto exit;
         }
 
@@ -1289,8 +1289,8 @@ exit:
  * @len: the length of the region to check
  *
  * This function returns zero if only 0xFF bytes are present at offset
- * @offset of the physical eraseblock @pnum, %1 if not, and a negative error
- * code if an error occurred.
+ * @offset of the physical eraseblock @pnum, and a negative error code if not
+ * or if an error occurred.
  */
 int ubi_dbg_check_all_ff(struct ubi_device *ubi, int pnum, int offset, int len)
 {
@@ -1321,7 +1321,7 @@ fail:
         ubi_msg("hex dump of the %d-%d region", offset, offset + len);
         print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1,
                        ubi->dbg_peb_buf, len, 1);
-        err = 1;
+        err = -EINVAL;
 error:
         ubi_dbg_dump_stack();
         mutex_unlock(&ubi->dbg_buf_mutex);
diff --git a/drivers/mtd/ubi/scan.c b/drivers/mtd/ubi/scan.c
index 90af61a2c3e4..594184bbd56a 100644
--- a/drivers/mtd/ubi/scan.c
+++ b/drivers/mtd/ubi/scan.c
@@ -974,11 +974,8 @@ struct ubi_scan_info *ubi_scan(struct ubi_device *ubi)
                         seb->ec = si->mean_ec;
 
         err = paranoid_check_si(ubi, si);
-        if (err) {
-                if (err > 0)
-                        err = -EINVAL;
+        if (err)
                 goto out_vidh;
-        }
 
         ubi_free_vid_hdr(ubi, vidh);
         kfree(ech);
@@ -1086,8 +1083,8 @@ void ubi_scan_destroy_si(struct ubi_scan_info *si)
  * @ubi: UBI device description object
  * @si: scanning information
  *
- * This function returns zero if the scanning information is all right, %1 if
- * not and a negative error code if an error occurred.
+ * This function returns zero if the scanning information is all right, and a
+ * negative error code if not or if an error occurred.
  */
 static int paranoid_check_si(struct ubi_device *ubi, struct ubi_scan_info *si)
 {
@@ -1346,7 +1343,7 @@ bad_vid_hdr:
 
 out:
         ubi_dbg_dump_stack();
-        return 1;
+        return -EINVAL;
 }
 
 #endif /* CONFIG_MTD_UBI_DEBUG_PARANOID */
diff --git a/drivers/mtd/ubi/wl.c b/drivers/mtd/ubi/wl.c
index 600c7229d5cf..f64ddabd4ac8 100644
--- a/drivers/mtd/ubi/wl.c
+++ b/drivers/mtd/ubi/wl.c
@@ -464,7 +464,7 @@ retry:
                                    ubi->peb_size - ubi->vid_hdr_aloffset);
         if (err) {
                 ubi_err("new PEB %d does not contain all 0xFF bytes", e->pnum);
-                return err > 0 ? -EINVAL : err;
+                return err;
         }
 
         return e->pnum;
@@ -513,7 +513,7 @@ static int sync_erase(struct ubi_device *ubi, struct ubi_wl_entry *e,
         dbg_wl("erase PEB %d, old EC %llu", e->pnum, ec);
 
         err = paranoid_check_ec(ubi, e->pnum, e->ec);
-        if (err > 0)
+        if (err)
                 return -EINVAL;
 
         ec_hdr = kzalloc(ubi->ec_hdr_alsize, GFP_NOFS);
@@ -1572,8 +1572,7 @@ void ubi_wl_close(struct ubi_device *ubi)
  * @ec: the erase counter to check
  *
  * This function returns zero if the erase counter of physical eraseblock @pnum
- * is equivalent to @ec, %1 if not, and a negative error code if an error
- * occurred.
+ * is equivalent to @ec, and a negative error code if not or if an error occurred.
  */
 static int paranoid_check_ec(struct ubi_device *ubi, int pnum, int ec)
 {
@@ -1611,8 +1610,8 @@ out_free:
  * @e: the wear-leveling entry to check
  * @root: the root of the tree
  *
- * This function returns zero if @e is in the @root RB-tree and %1 if it is
- * not.
+ * This function returns zero if @e is in the @root RB-tree and %-EINVAL if it
+ * is not.
  */
 static int paranoid_check_in_wl_tree(struct ubi_wl_entry *e,
                                      struct rb_root *root)
@@ -1623,7 +1622,7 @@ static int paranoid_check_in_wl_tree(struct ubi_wl_entry *e,
         ubi_err("paranoid check failed for PEB %d, EC %d, RB-tree %p ",
                 e->pnum, e->ec, root);
         ubi_dbg_dump_stack();
-        return 1;
+        return -EINVAL;
 }
 
 /**
@@ -1632,7 +1631,7 @@ static int paranoid_check_in_wl_tree(struct ubi_wl_entry *e,
  * @ubi: UBI device description object
  * @e: the wear-leveling entry to check
  *
- * This function returns zero if @e is in @ubi->pq and %1 if it is not.
+ * This function returns zero if @e is in @ubi->pq and %-EINVAL if it is not.
  */
 static int paranoid_check_in_pq(struct ubi_device *ubi, struct ubi_wl_entry *e)
 {
@@ -1647,6 +1646,6 @@ static int paranoid_check_in_pq(struct ubi_device *ubi, struct ubi_wl_entry *e)
         ubi_err("paranoid check failed for PEB %d, EC %d, Protect queue",
                 e->pnum, e->ec);
         ubi_dbg_dump_stack();
-        return 1;
+        return -EINVAL;
 }
 #endif /* CONFIG_MTD_UBI_DEBUG_PARANOID */