From 74d82d2660058e32644f0c673656b2a1d01d3688 Mon Sep 17 00:00:00 2001 From: Artem Bityutskiy Date: Fri, 3 Sep 2010 02:11:20 +0300 Subject: [PATCH] UBI: remove duplicate IO error codes The 'UBI_IO_PEB_EMPTY' and 'UBI_IO_PEB_FREE' are essentially the same and mean that there are only 0xFF bytes instead of headers. Simplify UBI a little by turning them into a single 'UBI_IO_FF' error code. Also, stop maintaining commentaries in 'ubi_io_read_vid_hdr()' which are almost identical to commentaries in 'ubi_io_read_ec_hdr()'. Signed-off-by: Artem Bityutskiy --- drivers/mtd/ubi/io.c | 45 +++++++----------------------------------- drivers/mtd/ubi/scan.c | 6 +++--- drivers/mtd/ubi/ubi.h | 8 ++------ drivers/mtd/ubi/wl.c | 2 +- 4 files changed, 13 insertions(+), 48 deletions(-) diff --git a/drivers/mtd/ubi/io.c b/drivers/mtd/ubi/io.c index 05774da4abca..1677a215af64 100644 --- a/drivers/mtd/ubi/io.c +++ b/drivers/mtd/ubi/io.c @@ -714,7 +714,7 @@ bad: * o %UBI_IO_BAD_HDR if the erase counter header is corrupted (a CRC error); * o %UBI_IO_BAD_HDR_EBADMSG is the same as %UBI_IO_BAD_HDR, but there also was * a data integrity error (uncorrectable ECC error in case of NAND); - * o %UBI_IO_PEB_EMPTY if the physical eraseblock is empty; + * o %UBI_IO_FF if only 0xFF bytes were read (the PEB is supposedly empty) * o a negative error code in case of failure. */ int ubi_io_read_ec_hdr(struct ubi_device *ubi, int pnum, @@ -762,7 +762,7 @@ int ubi_io_read_ec_hdr(struct ubi_device *ubi, int pnum, else if (UBI_IO_DEBUG) dbg_msg("no EC header found at PEB %d, " "only 0xFF bytes", pnum); - return UBI_IO_PEB_EMPTY; + return UBI_IO_FF; } /* @@ -977,19 +977,11 @@ bad: * * This function reads the volume identifier header from physical eraseblock * @pnum and stores it in @vid_hdr. It also checks CRC checksum of the read - * volume identifier header. The following codes may be returned: + * volume identifier header. The error codes are the same as in + * 'ubi_io_read_ec_hdr()'. * - * o %0 if the CRC checksum is correct and the header was successfully read; - * o %UBI_IO_BITFLIPS if the CRC is correct, but bit-flips were detected - * and corrected by the flash driver; this is harmless but may indicate that - * this eraseblock may become bad soon; - * o %UBI_IO_BAD_HDR if the volume identifier header is corrupted (a CRC - * error detected); - * o %UBI_IO_BAD_HDR_EBADMSG is the same as %UBI_IO_BAD_HDR, but there also was - * a data integrity error (uncorrectable ECC error in case of NAND); - * o %UBI_IO_PEB_FREE if the physical eraseblock is free (i.e., there is no VID - * header there); - * o a negative error code in case of failure. + * Note, the implementation of this function is also very similar to + * 'ubi_io_read_ec_hdr()', so refer commentaries in 'ubi_io_read_ec_hdr()'. */ int ubi_io_read_vid_hdr(struct ubi_device *ubi, int pnum, struct ubi_vid_hdr *vid_hdr, int verbose) @@ -1008,15 +1000,6 @@ int ubi_io_read_vid_hdr(struct ubi_device *ubi, int pnum, if (err != UBI_IO_BITFLIPS && err != -EBADMSG) return err; - /* - * We read all the data, but either a correctable bit-flip - * occurred, or MTD reported a data integrity error - * (uncorrectable ECC error in case of NAND). The former is - * harmless, the later may mean that the read data is - * corrupted. But we have a CRC check-sum and we will detect - * this. If the VID header is still OK, we just report this as - * there was a bit-flip, to force scrubbing. - */ if (err == -EBADMSG) read_err = UBI_IO_BAD_HDR_EBADMSG; } @@ -1026,25 +1009,16 @@ int ubi_io_read_vid_hdr(struct ubi_device *ubi, int pnum, if (read_err) return read_err; - /* - * If we have read all 0xFF bytes, the VID header probably does - * not exist and the physical eraseblock is assumed to be free. - */ if (check_pattern(vid_hdr, 0xFF, UBI_VID_HDR_SIZE)) { - /* The physical eraseblock is supposedly free */ if (verbose) ubi_warn("no VID header found at PEB %d, " "only 0xFF bytes", pnum); else if (UBI_IO_DEBUG) dbg_msg("no VID header found at PEB %d, " "only 0xFF bytes", pnum); - return UBI_IO_PEB_FREE; + return UBI_IO_FF; } - /* - * This is not a valid VID header, and these are not 0xFF - * bytes. Report that the header is corrupted. - */ if (verbose) { ubi_warn("bad magic number at PEB %d: %08x instead of " "%08x", pnum, magic, UBI_VID_HDR_MAGIC); @@ -1069,17 +1043,12 @@ int ubi_io_read_vid_hdr(struct ubi_device *ubi, int pnum, return read_err ?: UBI_IO_BAD_HDR; } - /* Validate the VID header that we have just read */ err = validate_vid_hdr(ubi, vid_hdr); if (err) { ubi_err("validation failed for PEB %d", pnum); return -EINVAL; } - /* - * If there was a read error (%-EBADMSG), but the header CRC is still - * OK, report about a bit-flip to force scrubbing on this PEB. - */ return read_err ? UBI_IO_BITFLIPS : 0; } diff --git a/drivers/mtd/ubi/scan.c b/drivers/mtd/ubi/scan.c index 7e7c56d162ec..37cb18ff10c6 100644 --- a/drivers/mtd/ubi/scan.c +++ b/drivers/mtd/ubi/scan.c @@ -748,7 +748,7 @@ static int process_eb(struct ubi_device *ubi, struct ubi_scan_info *si, return err; else if (err == UBI_IO_BITFLIPS) bitflips = 1; - else if (err == UBI_IO_PEB_EMPTY) + else if (err == UBI_IO_FF) return add_to_list(si, pnum, UBI_SCAN_UNKNOWN_EC, &si->erase); else if (err == UBI_IO_BAD_HDR_EBADMSG || err == UBI_IO_BAD_HDR) { /* @@ -817,7 +817,7 @@ static int process_eb(struct ubi_device *ubi, struct ubi_scan_info *si, else if (err == UBI_IO_BITFLIPS) bitflips = 1; else if (err == UBI_IO_BAD_HDR_EBADMSG || err == UBI_IO_BAD_HDR || - (err == UBI_IO_PEB_FREE && ec_corr)) { + (err == UBI_IO_FF && ec_corr)) { /* VID header is corrupted */ if (err == UBI_IO_BAD_HDR_EBADMSG || ec_corr == UBI_IO_BAD_HDR_EBADMSG) @@ -826,7 +826,7 @@ static int process_eb(struct ubi_device *ubi, struct ubi_scan_info *si, if (err) return err; goto adjust_mean_ec; - } else if (err == UBI_IO_PEB_FREE) { + } else if (err == UBI_IO_FF) { /* No VID header - the physical eraseblock is free */ err = add_to_list(si, pnum, ec, &si->free); if (err) diff --git a/drivers/mtd/ubi/ubi.h b/drivers/mtd/ubi/ubi.h index 24a7c7647cb7..774bdcad6a07 100644 --- a/drivers/mtd/ubi/ubi.h +++ b/drivers/mtd/ubi/ubi.h @@ -85,10 +85,7 @@ /* * Error codes returned by the I/O sub-system. * - * UBI_IO_PEB_EMPTY: the physical eraseblock is empty, i.e. it contains only - * %0xFF bytes - * UBI_IO_PEB_FREE: the physical eraseblock is free, i.e. it contains only a - * valid erase counter header, and the rest are %0xFF bytes + * UBI_IO_FF: the read region of flash contains only 0xFFs * UBI_IO_BAD_HDR: the EC or VID header is corrupted (bad magic or CRC) * UBI_IO_BAD_HDR_EBADMSG: the same as %UBI_IO_BAD_HDR, but also there was a * data integrity error reported by the MTD driver @@ -96,8 +93,7 @@ * UBI_IO_BITFLIPS: bit-flips were detected and corrected */ enum { - UBI_IO_PEB_EMPTY = 1, - UBI_IO_PEB_FREE, + UBI_IO_FF = 1, UBI_IO_BAD_HDR, UBI_IO_BAD_HDR_EBADMSG, UBI_IO_BITFLIPS diff --git a/drivers/mtd/ubi/wl.c b/drivers/mtd/ubi/wl.c index 97a435672eaf..a9e7c9eed703 100644 --- a/drivers/mtd/ubi/wl.c +++ b/drivers/mtd/ubi/wl.c @@ -745,7 +745,7 @@ static int wear_leveling_worker(struct ubi_device *ubi, struct ubi_work *wrk, err = ubi_io_read_vid_hdr(ubi, e1->pnum, vid_hdr, 0); if (err && err != UBI_IO_BITFLIPS) { - if (err == UBI_IO_PEB_FREE) { + if (err == UBI_IO_FF) { /* * We are trying to move PEB without a VID header. UBI * always write VID headers shortly after the PEB was