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| author |   Artem Bityutskiy <Artem.Bityutskiy@nokia.com> | 2008-12-04 20:52:44 +0200 |
|---|---|---|
| committer | Artem Bityutskiy <Artem.Bityutskiy@nokia.com> | 2008-12-05 13:46:49 +0200 |
| commit | 4df581f3dc6a91a63b9965ac8bdb47d8db294e37 (patch) | |
| tree | ddd44e9b424c999b615185c6c6d34c1d2983f6f4 /drivers/mtd | |
| parent | UBI: fix warnings when debugging is enabled (diff) | |
| download | linux-dev-4df581f3dc6a91a63b9965ac8bdb47d8db294e37.tar.xz linux-dev-4df581f3dc6a91a63b9965ac8bdb47d8db294e37.zip | |
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')
| -rw-r--r-- | drivers/mtd/ubi/eba.c | 14 |
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; } |