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authorArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2008-12-04 20:52:44 +0200
committerArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2008-12-05 13:46:49 +0200
commit4df581f3dc6a91a63b9965ac8bdb47d8db294e37 (patch)
treeddd44e9b424c999b615185c6c6d34c1d2983f6f4 /drivers/mtd/ubi
parented45819f315b5a8844b5bfce881a18e9f3a055e7 (diff)
downloadlinux-4df581f3dc6a91a63b9965ac8bdb47d8db294e37.tar.bz2
UBI: fix deadlock
We cannot call 'ubi_wl_get_peb()' with @ubi->buf_mutex locked, because 'ubi_wl_get_peb()' may force erasure, which, in turn, may call 'torture_peb()' which also locks the @ubi->buf_mutex and deadlocks. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Diffstat (limited to 'drivers/mtd/ubi')
-rw-r--r--drivers/mtd/ubi/eba.c14
1 files changed, 7 insertions, 7 deletions
diff --git a/drivers/mtd/ubi/eba.c b/drivers/mtd/ubi/eba.c
index d8966bae0e0b..2e4d6bf94582 100644
--- a/drivers/mtd/ubi/eba.c
+++ b/drivers/mtd/ubi/eba.c
@@ -504,12 +504,9 @@ static int recover_peb(struct ubi_device *ubi, int pnum, int vol_id, int lnum,
if (!vid_hdr)
return -ENOMEM;
- mutex_lock(&ubi->buf_mutex);
-
retry:
new_pnum = ubi_wl_get_peb(ubi, UBI_UNKNOWN);
if (new_pnum < 0) {
- mutex_unlock(&ubi->buf_mutex);
ubi_free_vid_hdr(ubi, vid_hdr);
return new_pnum;
}
@@ -529,20 +526,23 @@ retry:
goto write_error;
data_size = offset + len;
+ mutex_lock(&ubi->buf_mutex);
memset(ubi->peb_buf1 + offset, 0xFF, len);
/* Read everything before the area where the write failure happened */
if (offset > 0) {
err = ubi_io_read_data(ubi, ubi->peb_buf1, pnum, 0, offset);
if (err && err != UBI_IO_BITFLIPS)
- goto out_put;
+ goto out_unlock;
}
memcpy(ubi->peb_buf1 + offset, buf, len);
err = ubi_io_write_data(ubi, ubi->peb_buf1, new_pnum, 0, data_size);
- if (err)
+ if (err) {
+ mutex_unlock(&ubi->buf_mutex);
goto write_error;
+ }
mutex_unlock(&ubi->buf_mutex);
ubi_free_vid_hdr(ubi, vid_hdr);
@@ -553,8 +553,9 @@ retry:
ubi_msg("data was successfully recovered");
return 0;
-out_put:
+out_unlock:
mutex_unlock(&ubi->buf_mutex);
+out_put:
ubi_wl_put_peb(ubi, new_pnum, 1);
ubi_free_vid_hdr(ubi, vid_hdr);
return err;
@@ -567,7 +568,6 @@ write_error:
ubi_warn("failed to write to PEB %d", new_pnum);
ubi_wl_put_peb(ubi, new_pnum, 1);
if (++tries > UBI_IO_RETRIES) {
- mutex_unlock(&ubi->buf_mutex);
ubi_free_vid_hdr(ubi, vid_hdr);
return err;
}