[PATCH] mtd_dataflash, fix block vs page erase

Fix a bug in the block-erase optimization for Dataflash; it was using block
erase even for smaller segments that need page erase.

That wouldn't matter for JFFS2, which never erases less than one block
(sometimes several blocks), but for other callers it might.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Acked-by: David Woodhouse <dwmw2@infradead.org>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/mtd/devices/mtd_dataflash.c

@@ -178,7 +178,7 @@ static int dataflash_erase(struct mtd_info *mtd, struct erase_info *instr)
 		 * we're at a block boundary and need to erase the whole block.
 		 */
 		pageaddr = instr->addr / priv->page_size;
-		do_block = (pageaddr & 0x7) == 0 && instr->len <= blocksize;
+		do_block = (pageaddr & 0x7) == 0 && instr->len >= blocksize;
 		pageaddr = pageaddr << priv->page_offset;
 
 		command[0] = do_block ? OP_ERASE_BLOCK : OP_ERASE_PAGE;