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Commit b3321508 authored by Artem Bityutskiy's avatar Artem Bityutskiy
Browse files

UBI: change cascade of ifs to switch statements 



This patch improves readability and simplifies scanning code by changing a
long cascade of 'if' statements to a switch statement. This should presumably
be a little faster as well.

Signed-off-by: default avatarArtem Bityutskiy <Artem.Bityutskiy@nokia.com>
parent e0e718c2

drivers/mtd/ubi/scan.c

+32 −13
Original line number Diff line number Diff line
@@ -746,11 +746,18 @@ static int process_eb(struct ubi_device *ubi, struct ubi_scan_info *si, 
	err = ubi_io_read_ec_hdr(ubi, pnum, ech, 0);

	if (err < 0)

		return err;

	else if (err == UBI_IO_BITFLIPS)

	switch (err) {

	case 0:

		break;

	case UBI_IO_BITFLIPS:

		bitflips = 1;

	else if (err == UBI_IO_FF || err == UBI_IO_FF_BITFLIPS)

		break;

	case UBI_IO_FF:

	case UBI_IO_FF_BITFLIPS:

		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) {

	case UBI_IO_BAD_HDR_EBADMSG:

		si->read_err_count += 1;

	case UBI_IO_BAD_HDR:

		/*

		 * We have to also look at the VID header, possibly it is not

		 * corrupted. Set %bitflips flag in order to make this PEB be
@@ -759,6 +766,10 @@ static int process_eb(struct ubi_device *ubi, struct ubi_scan_info *si, 
		ec_err = err;

		ec = UBI_SCAN_UNKNOWN_EC;

		bitflips = 1;

		break;

	default:

		ubi_err("'ubi_io_read_ec_hdr()' returned unknown code %d", err);

		return -EINVAL;

	}



	if (!ec_err) {
@@ -814,24 +825,32 @@ static int process_eb(struct ubi_device *ubi, struct ubi_scan_info *si, 
	err = ubi_io_read_vid_hdr(ubi, pnum, vidh, 0);

	if (err < 0)

		return err;

	else if (err == UBI_IO_BITFLIPS)

	switch (err) {

	case 0:

		break;

	case UBI_IO_BITFLIPS:

		bitflips = 1;

	else if (err == UBI_IO_BAD_HDR_EBADMSG || err == UBI_IO_BAD_HDR ||

		 (err == UBI_IO_FF && ec_err) || err == UBI_IO_FF_BITFLIPS) {

		/* VID header is corrupted */

		if (err == UBI_IO_BAD_HDR_EBADMSG ||

		    ec_err == UBI_IO_BAD_HDR_EBADMSG)

		break;

	case UBI_IO_BAD_HDR_EBADMSG:

		si->read_err_count += 1;

	case UBI_IO_BAD_HDR:

	case UBI_IO_FF_BITFLIPS:

		err = add_to_list(si, pnum, ec, &si->corr);

		if (err)

			return err;

		goto adjust_mean_ec;

	} else if (err == UBI_IO_FF) {

		/* No VID header - the physical eraseblock is free */

	case UBI_IO_FF:

		if (ec_err)

			err = add_to_list(si, pnum, ec, &si->corr);

		else

			err = add_to_list(si, pnum, ec, &si->free);

		if (err)

			return err;

		goto adjust_mean_ec;

	default:

		ubi_err("'ubi_io_read_vid_hdr()' returned unknown code %d",

			err);

		return -EINVAL;

	}



	vol_id = be32_to_cpu(vidh->vol_id);