From d125a753425b9de3c251df519e521024c79c663d Mon Sep 17 00:00:00 2001 From: Artem Bityutskiy Date: Fri, 26 Oct 2012 16:11:26 +0300 Subject: [PATCH] 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 , but then he dropped it and I picked up and tweaked a little bit. Signed-off-by: Artem Bityutskiy --- drivers/mtd/ubi/attach.c | 19 +++++++------------ 1 file changed, 7 insertions(+), 12 deletions(-) diff --git a/drivers/mtd/ubi/attach.c b/drivers/mtd/ubi/attach.c index fec406b4553d..72fed3027304 100644 --- a/drivers/mtd/ubi/attach.c +++ b/drivers/mtd/ubi/attach.c @@ -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;