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Commit d125a753 authored by Artem Bityutskiy's avatar Artem Bityutskiy
Browse files

UBI: do not allocate the memory unnecessarily 



UBI reserves an LEB sized buffer for various needs. We can use this buffer
while scanning, instead of allocating another one. This patch was originally
created by Jan Luebbe <jlu@pengutronix.de>, but then he dropped it and I picked
up and tweaked a little bit.

Signed-off-by: default avatarArtem Bityutskiy <artem.bityutskiy@linux.intel.com>
parent 6a059abd

drivers/mtd/ubi/attach.c

+7 −12
Original line number Diff line number Diff line
@@ -322,7 +322,6 @@ static struct ubi_ainf_volume *add_volume(struct ubi_attach_info *ai, 
int ubi_compare_lebs(struct ubi_device *ubi, const struct ubi_ainf_peb *aeb,

			int pnum, const struct ubi_vid_hdr *vid_hdr)

{

	void *buf;

	int len, err, second_is_newer, bitflips = 0, corrupted = 0;

	uint32_t data_crc, crc;

	struct ubi_vid_hdr *vh = NULL;
@@ -393,18 +392,14 @@ int ubi_compare_lebs(struct ubi_device *ubi, const struct ubi_ainf_peb *aeb, 
	/* Read the data of the copy and check the CRC */



	len = be32_to_cpu(vid_hdr->data_size);

	buf = vmalloc(len);

	if (!buf) {

		err = -ENOMEM;

		goto out_free_vidh;

	}



	err = ubi_io_read_data(ubi, buf, pnum, 0, len);

	mutex_lock(&ubi->buf_mutex);

	err = ubi_io_read_data(ubi, ubi->peb_buf, pnum, 0, len);

	if (err && err != UBI_IO_BITFLIPS && !mtd_is_eccerr(err))

		goto out_free_buf;

		goto out_unlock;



	data_crc = be32_to_cpu(vid_hdr->data_crc);

	crc = crc32(UBI_CRC32_INIT, buf, len);

	crc = crc32(UBI_CRC32_INIT, ubi->peb_buf, len);

	if (crc != data_crc) {

		dbg_bld("PEB %d CRC error: calculated %#08x, must be %#08x",

			pnum, crc, data_crc);
@@ -415,8 +410,8 @@ int ubi_compare_lebs(struct ubi_device *ubi, const struct ubi_ainf_peb *aeb, 
		dbg_bld("PEB %d CRC is OK", pnum);

		bitflips = !!err;

	}

	mutex_unlock(&ubi->buf_mutex);



	vfree(buf);

	ubi_free_vid_hdr(ubi, vh);



	if (second_is_newer)
@@ -426,8 +421,8 @@ int ubi_compare_lebs(struct ubi_device *ubi, const struct ubi_ainf_peb *aeb, 


	return second_is_newer | (bitflips << 1) | (corrupted << 2);



out_free_buf:

	vfree(buf);

out_unlock:

	mutex_unlock(&ubi->buf_mutex);

out_free_vidh:

	ubi_free_vid_hdr(ubi, vh);

	return err;