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authorArtem B. Bityuckiy <dedekind@infradead.org>2005-04-05 13:51:58 +0100
committerThomas Gleixner <tglx@mtd.linutronix.de>2005-05-23 13:09:29 +0200
commit894214d1a75745a283d5f1921125b3ad36d7ba26 (patch)
tree70dd3913dfb671871348878b1f2a4c30427e2d73 /fs/jffs2/wbuf.c
parent22c60f5fb7b8184a2d00a607f965b54c586fb40e (diff)
downloadop-kernel-dev-894214d1a75745a283d5f1921125b3ad36d7ba26.zip
op-kernel-dev-894214d1a75745a283d5f1921125b3ad36d7ba26.tar.gz
[JFFS2] Fix race problems with wbuf.
Signed-off-by: Artem B. Bityuckiy <dedekind@infradead.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'fs/jffs2/wbuf.c')
-rw-r--r--fs/jffs2/wbuf.c12
1 files changed, 4 insertions, 8 deletions
diff --git a/fs/jffs2/wbuf.c b/fs/jffs2/wbuf.c
index 0a76768..996d922 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 1.91 2005/03/18 09:58:06 dedekind Exp $
+ * $Id: wbuf.c,v 1.92 2005/04/05 12:51:54 dedekind Exp $
*
*/
@@ -873,6 +873,7 @@ int jffs2_flash_read(struct jffs2_sb_info *c, loff_t ofs, size_t len, size_t *re
return c->mtd->read(c->mtd, ofs, len, retlen, buf);
/* Read flash */
+ down_read(&c->wbuf_sem);
if (jffs2_cleanmarker_oob(c))
ret = c->mtd->read_ecc(c->mtd, ofs, len, retlen, buf, NULL, c->oobinfo);
else
@@ -896,16 +897,11 @@ 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)
- return ret;;
+ goto exit;
/* if we read in a different block, return */
if (SECTOR_ADDR(ofs) != SECTOR_ADDR(c->wbuf_ofs))
- 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);
+ goto exit;
if (ofs >= c->wbuf_ofs) {
owbf = (ofs - c->wbuf_ofs); /* offset in write buffer */
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