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| author | Estelle Hammache <estelle.hammache@st.com> | 2005-02-05 18:23:40 +0000 |
|---|---|---|
| committer | Thomas Gleixner <tglx@mtd.linutronix.de> | 2005-05-23 12:23:54 +0200 |
| commit | 67d9e95c393d23c229836e28b262dc73d71da784 (patch) | |
| tree | 1c22b8ad2715d8155570aa082d6c20ed8c269e11 /fs/jffs2/wbuf.c | |
| parent | 72b56a2d7dccd9ea90f34f6ddb653086a3f3bd2e (diff) | |
| download | linux-67d9e95c393d23c229836e28b262dc73d71da784.tar.gz linux-67d9e95c393d23c229836e28b262dc73d71da784.tar.bz2 linux-67d9e95c393d23c229836e28b262dc73d71da784.zip | |
[JFFS2] Prevent deadlock during write buffer recovery
Prevent deadlock when checking erased block for
space allocation during wbuf recovery.
Signed-off-by: Estelle Hammache <estelle.hammache@st.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'fs/jffs2/wbuf.c')
| -rw-r--r-- | fs/jffs2/wbuf.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/fs/jffs2/wbuf.c b/fs/jffs2/wbuf.c index 4346940b4871..79414abadd5e 100644 --- a/fs/jffs2/wbuf.c +++ b/fs/jffs2/wbuf.c @@ -9,7 +9,7 @@ * * For licensing information, see the file 'LICENCE' in this directory. * - * $Id: wbuf.c,v 1.85 2005/02/02 22:12:04 dwmw2 Exp $ + * $Id: wbuf.c,v 1.86 2005/02/05 18:23:37 hammache Exp $ * */ @@ -865,7 +865,6 @@ int jffs2_flash_read(struct jffs2_sb_info *c, loff_t ofs, size_t len, size_t *re /* Read flash */ if (!jffs2_can_mark_obsolete(c)) { - down_read(&c->wbuf_sem); if (jffs2_cleanmarker_oob(c)) ret = c->mtd->read_ecc(c->mtd, ofs, len, retlen, buf, NULL, c->oobinfo); @@ -892,11 +891,16 @@ int jffs2_flash_read(struct jffs2_sb_info *c, loff_t ofs, size_t len, size_t *re /* if no writebuffer available or write buffer empty, return */ if (!c->wbuf_pagesize || !c->wbuf_len) - goto exit; + return ret;; /* if we read in a different block, return */ if ( (ofs & ~(c->sector_size-1)) != (c->wbuf_ofs & ~(c->sector_size-1)) ) - goto exit; + return ret; + + /* Lock only if we have reason to believe wbuf contains relevant data, + so that checking an erased block during wbuf recovery space allocation + does not deadlock. */ + down_read(&c->wbuf_sem); if (ofs >= c->wbuf_ofs) { owbf = (ofs - c->wbuf_ofs); /* offset in write buffer */ |