[PATCH] gen_probe forgets to clean chip_map

[Robert Schwebel]

On systems that have more than one flash chip in a probe window with
some space between the chips we recently found that erase operations are
performed on the wrong chip. This comes from the chip_map being
allocated in genprobe_ident_chips() but it is never cleaned before being
used. Here is a patch: 

----------8<----------
diff -urN mtd-20040622-1/drivers/mtd/chips/gen_probe.c mtd-20040622-1-ptx1/drivers/mtd/chips/gen_probe.c
--- mtd-20040622-1/drivers/mtd/chips/gen_probe.c	2003-11-09 00:00:04.000000000 +0100
+++ mtd-20040622-1-ptx1/drivers/mtd/chips/gen_probe.c	2004-06-25 14:38:28.000000000 +0200
@@ -114,6 +114,7 @@
 		kfree(cfi.cfiq);
 		return NULL;
 	}
+	memset(chip_map, 0, ((max_chips / 8) + ((max_chips % 8) ? 1 : 0)));
 
 	set_bit(0, chip_map); /* Mark first chip valid */
----------8<----------
 
Signed-off-by: Robert Schwebel <r.schwebel at pengutronix.de>
Signed-off-by: Benedikt Spranger <b.spranger at pengutronix.de>
Signed-off-by: Kai-Uwe Bloem <linux-development at auerswald.de>

Robert
-- 
 Dipl.-Ing. Robert Schwebel | http://www.pengutronix.de
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