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authorArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2011-03-14 18:09:40 +0300
committerArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2011-03-16 14:50:16 +0300
commit332873d60b943c9bf53957c6e334038ac5e9dc6b (patch)
treef930b7e315d478901d567ec4057cc78e789d3e2c /drivers/mtd/ubi/io.c
parenta75867432a7eb2cdcaa8613a3b72b1d0594dd930 (diff)
downloadlinux-332873d60b943c9bf53957c6e334038ac5e9dc6b.tar.xz
UBI: allocate erase checking buffer on demand
Instead of using pre-allocated 'ubi->dbg_peb_buf' buffer in 'ubi_dbg_check_all_ff()', 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/mtd/ubi/io.c')
-rw-r--r--drivers/mtd/ubi/io.c19
1 files changed, 12 insertions, 7 deletions
diff --git a/drivers/mtd/ubi/io.c b/drivers/mtd/ubi/io.c
index b4d34ba60608..35da5aadbe10 100644
--- a/drivers/mtd/ubi/io.c
+++ b/drivers/mtd/ubi/io.c
@@ -1387,35 +1387,40 @@ int ubi_dbg_check_all_ff(struct ubi_device *ubi, int pnum, int offset, int len)
{
size_t read;
int err;
+ void *buf;
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);
+ buf = __vmalloc(len, GFP_KERNEL | GFP_NOFS, PAGE_KERNEL);
+ if (!buf) {
+ ubi_err("cannot allocate memory to check for 0xFFs");
+ return 0;
+ }
+
+ err = ubi->mtd->read(ubi->mtd, addr, len, &read, buf);
if (err && err != -EUCLEAN) {
ubi_err("error %d while reading %d bytes from PEB %d:%d, "
"read %zd bytes", err, len, pnum, offset, read);
goto error;
}
- err = ubi_check_pattern(ubi->dbg_peb_buf, 0xFF, len);
+ err = ubi_check_pattern(buf, 0xFF, len);
if (err == 0) {
ubi_err("flash region at PEB %d:%d, length %d does not "
"contain all 0xFF bytes", pnum, offset, len);
goto fail;
}
- mutex_unlock(&ubi->dbg_buf_mutex);
+ vfree(buf);
return 0;
fail:
ubi_err("paranoid check failed for PEB %d", pnum);
ubi_msg("hex dump of the %d-%d region", offset, offset + len);
- print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1,
- ubi->dbg_peb_buf, len, 1);
+ print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1, buf, len, 1);
err = -EINVAL;
error:
ubi_dbg_dump_stack();
- mutex_unlock(&ubi->dbg_buf_mutex);
+ vfree(buf);
return err;
}