Merge git://git.infradead.org/mtd-2.6

* git://git.infradead.org/mtd-2.6:
  [JFFS2] fix race condition in jffs2_lzo_compress()
  [MTD] [NOR] Fix cfi_send_gen_cmd handling of x16 devices in x8 mode (v4)
  [JFFS2] Fix lack of locking in thread_should_wake()
  [JFFS2] Fix build failure with !CONFIG_JFFS2_FS_WRITEBUFFER
  [MTD] [NAND] OMAP2: remove duplicated #include

drivers/mtd/chips/cfi_cmdset_0002.c

@@ -406,19 +406,6 @@ struct mtd_info *cfi_cmdset_0002(struct map_info *map, int primary)
 		/* Set the default CFI lock/unlock addresses */
 		cfi->addr_unlock1 = 0x555;
 		cfi->addr_unlock2 = 0x2aa;
-		/* Modify the unlock address if we are in compatibility mode */
-		if (	/* x16 in x8 mode */
-			((cfi->device_type == CFI_DEVICETYPE_X8) &&
-				(cfi->cfiq->InterfaceDesc ==
-					CFI_INTERFACE_X8_BY_X16_ASYNC)) ||
-			/* x32 in x16 mode */
-			((cfi->device_type == CFI_DEVICETYPE_X16) &&
-				(cfi->cfiq->InterfaceDesc ==
-					CFI_INTERFACE_X16_BY_X32_ASYNC)))
-		{
-			cfi->addr_unlock1 = 0xaaa;
-			cfi->addr_unlock2 = 0x555;
-		}
 
 	} /* CFI mode */
 	else if (cfi->cfi_mode == CFI_MODE_JEDEC) {

drivers/mtd/chips/jedec_probe.c

@@ -1808,9 +1808,7 @@ static inline u32 jedec_read_mfr(struct map_info *map, uint32_t base,
 	 * several first banks can contain 0x7f instead of actual ID
 	 */
 	do {
-		uint32_t ofs = cfi_build_cmd_addr(0 + (bank << 8),
+		uint32_t ofs = cfi_build_cmd_addr(0 + (bank << 8), map, cfi);
-						  cfi_interleave(cfi),
-						  cfi->device_type);
 		mask = (1 << (cfi->device_type * 8)) - 1;
 		result = map_read(map, base + ofs);
 		bank++;
@@ -1824,7 +1822,7 @@ static inline u32 jedec_read_id(struct map_info *map, uint32_t base,
 {
 	map_word result;
 	unsigned long mask;
-	u32 ofs = cfi_build_cmd_addr(1, cfi_interleave(cfi), cfi->device_type);
+	u32 ofs = cfi_build_cmd_addr(1, map, cfi);
 	mask = (1 << (cfi->device_type * 8)) -1;
 	result = map_read(map, base + ofs);
 	return result.x[0] & mask;
@@ -2067,8 +2065,8 @@ static int jedec_probe_chip(struct map_info *map, __u32 base,
 
 	}
 	/* Ensure the unlock addresses we try stay inside the map */
-	probe_offset1 = cfi_build_cmd_addr(cfi->addr_unlock1, cfi_interleave(cfi), cfi->device_type);
+	probe_offset1 = cfi_build_cmd_addr(cfi->addr_unlock1, map, cfi);
-	probe_offset2 = cfi_build_cmd_addr(cfi->addr_unlock2, cfi_interleave(cfi), cfi->device_type);
+	probe_offset2 = cfi_build_cmd_addr(cfi->addr_unlock2, map, cfi);
 	if (	((base + probe_offset1 + map_bankwidth(map)) >= map->size) ||
 		((base + probe_offset2 + map_bankwidth(map)) >= map->size))
 		goto retry;

fs/jffs2/background.c

@@ -85,15 +85,15 @@ static int jffs2_garbage_collect_thread(void *_c)
 	for (;;) {
 		allow_signal(SIGHUP);
 	again:
+		spin_lock(&c->erase_completion_lock);
 		if (!jffs2_thread_should_wake(c)) {
 			set_current_state (TASK_INTERRUPTIBLE);
+			spin_unlock(&c->erase_completion_lock);
 			D1(printk(KERN_DEBUG "jffs2_garbage_collect_thread sleeping...\n"));
-			/* Yes, there's a race here; we checked jffs2_thread_should_wake()
-			   before setting current->state to TASK_INTERRUPTIBLE. But it doesn't
-			   matter - We don't care if we miss a wakeup, because the GC thread
-			   is only an optimisation anyway. */
 			schedule();
-		}
+		} else
+			spin_unlock(&c->erase_completion_lock);
+			
 
 		/* This thread is purely an optimisation. But if it runs when
 		   other things could be running, it actually makes things a

fs/jffs2/compr_lzo.c

@@ -19,7 +19,7 @@
 
 static void *lzo_mem;
 static void *lzo_compress_buf;
-static DEFINE_MUTEX(deflate_mutex);
+static DEFINE_MUTEX(deflate_mutex);	/* for lzo_mem and lzo_compress_buf */
 
 static void free_workspace(void)
 {
@@ -49,18 +49,21 @@ static int jffs2_lzo_compress(unsigned char *data_in, unsigned char *cpage_out,
 
 	mutex_lock(&deflate_mutex);
 	ret = lzo1x_1_compress(data_in, *sourcelen, lzo_compress_buf, &compress_size, lzo_mem);
-	mutex_unlock(&deflate_mutex);
-
 	if (ret != LZO_E_OK)
-		return -1;
+		goto fail;
 
 	if (compress_size > *dstlen)
-		return -1;
+		goto fail;
 
 	memcpy(cpage_out, lzo_compress_buf, compress_size);
-	*dstlen = compress_size;
+	mutex_unlock(&deflate_mutex);
 
+	*dstlen = compress_size;
 	return 0;
+
+ fail:
+	mutex_unlock(&deflate_mutex);
+	return -1;
 }
 
 static int jffs2_lzo_decompress(unsigned char *data_in, unsigned char *cpage_out,

fs/jffs2/nodemgmt.c

@@ -261,9 +261,11 @@ static int jffs2_find_nextblock(struct jffs2_sb_info *c)
 
 	jffs2_sum_reset_collected(c->summary); /* reset collected summary */
 
+#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
 	/* adjust write buffer offset, else we get a non contiguous write bug */
 	if (!(c->wbuf_ofs % c->sector_size) && !c->wbuf_len)
 		c->wbuf_ofs = 0xffffffff;
+#endif
 
 	D1(printk(KERN_DEBUG "jffs2_find_nextblock(): new nextblock = 0x%08x\n", c->nextblock->offset));
 

include/linux/mtd/cfi.h

@@ -282,9 +282,25 @@ struct cfi_private {
 /*
  * Returns the command address according to the given geometry.
  */
-static inline uint32_t cfi_build_cmd_addr(uint32_t cmd_ofs, int interleave, int type)
+static inline uint32_t cfi_build_cmd_addr(uint32_t cmd_ofs,
+				struct map_info *map, struct cfi_private *cfi)
 {
-	return (cmd_ofs * type) * interleave;
+	unsigned bankwidth = map_bankwidth(map);
+	unsigned interleave = cfi_interleave(cfi);
+	unsigned type = cfi->device_type;
+	uint32_t addr;
+	
+	addr = (cmd_ofs * type) * interleave;
+
+	/* Modify the unlock address if we are in compatiblity mode.
+	 * For 16bit devices on 8 bit busses
+	 * and 32bit devices on 16 bit busses
+	 * set the low bit of the alternating bit sequence of the address.
+	 */
+	if (((type * interleave) > bankwidth) && ((uint8_t)cmd_ofs == 0xaa))
+		addr |= (type >> 1)*interleave;
+
+	return  addr;
 }
 
 /*
@@ -430,7 +446,7 @@ static inline uint32_t cfi_send_gen_cmd(u_char cmd, uint32_t cmd_addr, uint32_t
 				int type, map_word *prev_val)
 {
 	map_word val;
-	uint32_t addr = base + cfi_build_cmd_addr(cmd_addr, cfi_interleave(cfi), type);
+	uint32_t addr = base + cfi_build_cmd_addr(cmd_addr, map, cfi);
 	val = cfi_build_cmd(cmd, map, cfi);
 
 	if (prev_val)