From: Thomas Gleixner <tglx@cruncher.tec.linutronix.de>
Date: Tue, 27 Jun 2006 22:11:45 +0000 (+0200)
Subject: [MTD] NAND: Select chip before checking write protect status
X-Git-Tag: firefly_0821_release~34835^2
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=6a93096195305f6f2a39544a034e77e2e74d5799;p=firefly-linux-kernel-4.4.55.git

[MTD] NAND: Select chip before checking write protect status

The other way round works not really well with boards which have a
static NAND chipselect.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
---

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 8df184f6d8d1..80a76654d963 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -1610,13 +1610,13 @@ static int nand_do_write_ops(struct mtd_info *mtd, loff_t to,
 	if (!writelen)
 		return 0;
 
+	chipnr = (int)(to >> chip->chip_shift);
+	chip->select_chip(mtd, chipnr);
+
 	/* Check, if it is write protected */
 	if (nand_check_wp(mtd))
 		return -EIO;
 
-	chipnr = (int)(to >> chip->chip_shift);
-	chip->select_chip(mtd, chipnr);
-
 	realpage = (int)(to >> chip->page_shift);
 	page = realpage & chip->pagemask;
 	blockmask = (1 << (chip->phys_erase_shift - chip->page_shift)) - 1;