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| author | Josselin Costanzi <josselin.costanzi@mobile-devices.fr> | 2012-02-22 16:37:05 +0100 |
|---|---|---|
| committer | Artem Bityutskiy <artem.bityutskiy@linux.intel.com> | 2012-03-09 09:39:31 +0200 |
| commit | 43b043e78b876ce27034f167897b57fd2556ad29 (patch) | |
| tree | 3397ed09387b4f74b4c2f23b1d04943baa0c7b11 /drivers/mtd/ubi/eba.c | |
| parent | 7eb3aa65853e1b223bfc786b023b702018cb76c0 (diff) | |
| download | linux-stable-43b043e78b876ce27034f167897b57fd2556ad29.tar.gz linux-stable-43b043e78b876ce27034f167897b57fd2556ad29.tar.bz2 linux-stable-43b043e78b876ce27034f167897b57fd2556ad29.zip | |
UBI: reduce memory consumption
Remove the pre-allocated 'peb_buf2' buffer because we do not really need it.
The only reason UBI has it is to check that the data were written correctly.
But we do not have to have 2 buffers for this and waste RAM - we can just
compare CRC checksums instead. This reduces UBI memory consumption.
Artem bityutskiy: massaged the patch and commit message
Signed-off-by: Josselin Costanzi <josselin.costanzi@mobile-devices.fr>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Diffstat (limited to 'drivers/mtd/ubi/eba.c')
| -rw-r--r-- | drivers/mtd/ubi/eba.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/mtd/ubi/eba.c b/drivers/mtd/ubi/eba.c index cd26da8ad225..f548af3c98bb 100644 --- a/drivers/mtd/ubi/eba.c +++ b/drivers/mtd/ubi/eba.c @@ -1134,8 +1134,8 @@ int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to, * We've written the data and are going to read it back to make * sure it was written correctly. */ - - err = ubi_io_read_data(ubi, ubi->peb_buf2, to, 0, aldata_size); + memset(ubi->peb_buf1, 0xFF, aldata_size); + err = ubi_io_read_data(ubi, ubi->peb_buf1, to, 0, aldata_size); if (err) { if (err != UBI_IO_BITFLIPS) { ubi_warn("error %d while reading data back " @@ -1149,7 +1149,7 @@ int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to, cond_resched(); - if (memcmp(ubi->peb_buf1, ubi->peb_buf2, aldata_size)) { + if (crc != crc32(UBI_CRC32_INIT, ubi->peb_buf1, data_size)) { ubi_warn("read data back from PEB %d and it is " "different", to); err = -EINVAL; |