diff options
| author | Artem Bityutskiy <Artem.Bityutskiy@nokia.com> | 2011-03-14 17:06:52 +0200 |
|---|---|---|
| committer | Artem Bityutskiy <Artem.Bityutskiy@nokia.com> | 2011-03-16 13:50:16 +0200 |
| commit | a75867432a7eb2cdcaa8613a3b72b1d0594dd930 (patch) | |
| tree | f83b3760bf171a3402ff48616726c6c71d01df2c /drivers | |
| parent | a87f29cbbcbd5bd1e4990367cd18967e9bbeacff (diff) | |
UBI: allocate write checking buffer on demand
Instead of using pre-allocated 'ubi->dbg_peb_buf' buffer in
'ubi_dbg_check_write()', dynamically allocate it when needed. The
intend is to get rid of the pre-allocated 'ubi->dbg_peb_buf' buffer
completely. And the need for this arises because we want to change
to dynamic debugging control instead of compile-time control, i.e.,
we are going to kill the CONFIG_MTD_UBI_DEBUG_PARANOID Kconfig
option, which would mean that 'ubi->dbg_peb_buf' is always allocated,
which would be wasteful.
Thus, we are getting rid of 'ubi->dbg_peb_buf', and this is a
preparation for that.
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mtd/ubi/io.c | 24 | ||||
| -rw-r--r-- | drivers/mtd/ubi/ubi.h | 1 |
2 files changed, 16 insertions, 9 deletions
diff --git a/drivers/mtd/ubi/io.c b/drivers/mtd/ubi/io.c index 889e25c49323..b4d34ba60608 100644 --- a/drivers/mtd/ubi/io.c +++ b/drivers/mtd/ubi/io.c @@ -1326,16 +1326,22 @@ int ubi_dbg_check_write(struct ubi_device *ubi, const void *buf, int pnum, { int err, i; size_t read; + void *buf1; loff_t addr = (loff_t)pnum * ubi->peb_size + offset; - mutex_lock(&ubi->dbg_buf_mutex); - err = ubi->mtd->read(ubi->mtd, addr, len, &read, ubi->dbg_peb_buf); + buf1 = __vmalloc(len, GFP_KERNEL | GFP_NOFS, PAGE_KERNEL); + if (!buf1) { + ubi_err("cannot allocate memory to check writes"); + return 0; + } + + err = ubi->mtd->read(ubi->mtd, addr, len, &read, buf1); if (err && err != -EUCLEAN) - goto out_unlock; + goto out_free; for (i = 0; i < len; i++) { uint8_t c = ((uint8_t *)buf)[i]; - uint8_t c1 = ((uint8_t *)ubi->dbg_peb_buf)[i]; + uint8_t c1 = ((uint8_t *)buf1)[i]; int dump_len; if (c == c1) @@ -1352,17 +1358,17 @@ int ubi_dbg_check_write(struct ubi_device *ubi, const void *buf, int pnum, ubi_msg("hex dump of the read buffer from %d to %d", i, i + dump_len); print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1, - ubi->dbg_peb_buf + i, dump_len, 1); + buf1 + i, dump_len, 1); ubi_dbg_dump_stack(); err = -EINVAL; - goto out_unlock; + goto out_free; } - mutex_unlock(&ubi->dbg_buf_mutex); + vfree(buf1); return 0; -out_unlock: - mutex_unlock(&ubi->dbg_buf_mutex); +out_free: + vfree(buf1); return err; } diff --git a/drivers/mtd/ubi/ubi.h b/drivers/mtd/ubi/ubi.h index 0b0149c41fe3..9af362c2a137 100644 --- a/drivers/mtd/ubi/ubi.h +++ b/drivers/mtd/ubi/ubi.h @@ -40,6 +40,7 @@ #include <linux/notifier.h> #include <linux/mtd/mtd.h> #include <linux/mtd/ubi.h> +#include <asm/pgtable.h> #include "ubi-media.h" #include "scan.h" |