openwrt_chaos_calmer/target/linux/lantiq/patches-3.18/0017-MTD-xway-fix-nand-locking.patch

From aa705c1b0860da91f2ed1a4c0b57337e6de689e1 Mon Sep 17 00:00:00 2001
From: John Crispin <blogic@openwrt.org>
Date: Thu, 7 Aug 2014 18:55:31 +0200
Subject: [PATCH 17/36] MTD: xway: fix nand locking

Signed-off-by: John Crispin <blogic@openwrt.org>
---
 drivers/mtd/nand/xway_nand.c |   15 +++------------
 1 file changed, 3 insertions(+), 12 deletions(-)

--- a/drivers/mtd/nand/xway_nand.c
+++ b/drivers/mtd/nand/xway_nand.c
@@ -80,13 +80,16 @@ static void xway_reset_chip(struct nand_
 
 static void xway_select_chip(struct mtd_info *mtd, int chip)
 {
+	static unsigned long csflags;
 
 	switch (chip) {
 	case -1:
 		ltq_ebu_w32_mask(NAND_CON_CE, 0, EBU_NAND_CON);
 		ltq_ebu_w32_mask(NAND_CON_NANDM, 0, EBU_NAND_CON);
+		spin_unlock_irqrestore(&ebu_lock, csflags);
 		break;
 	case 0:
+		spin_lock_irqsave(&ebu_lock, csflags);
 		ltq_ebu_w32_mask(0, NAND_CON_NANDM, EBU_NAND_CON);
 		ltq_ebu_w32_mask(0, NAND_CON_CE, EBU_NAND_CON);
 		break;
@@ -99,7 +102,6 @@ static void xway_cmd_ctrl(struct mtd_inf
 {
 	struct nand_chip *this = mtd->priv;
 	unsigned long nandaddr = (unsigned long) this->IO_ADDR_W;
-	unsigned long flags;
 
 	if (ctrl & NAND_CTRL_CHANGE) {
 		if (ctrl & NAND_CLE)
@@ -109,11 +111,9 @@ static void xway_cmd_ctrl(struct mtd_inf
 	}
 
 	if (cmd != NAND_CMD_NONE) {
-		spin_lock_irqsave(&ebu_lock, flags);
 		writeb(cmd, (void __iomem *) (nandaddr | xway_latchcmd));
 		while ((ltq_ebu_r32(EBU_NAND_WAIT) & NAND_WAIT_WR_C) == 0)
 			;
-		spin_unlock_irqrestore(&ebu_lock, flags);
 	}
 }
 
@@ -126,12 +126,9 @@ static unsigned char xway_read_byte(stru
 {
 	struct nand_chip *this = mtd->priv;
 	unsigned long nandaddr = (unsigned long) this->IO_ADDR_R;
-	unsigned long flags;
 	int ret;
 
-	spin_lock_irqsave(&ebu_lock, flags);
 	ret = ltq_r8((void __iomem *)(nandaddr | NAND_READ_DATA));
-	spin_unlock_irqrestore(&ebu_lock, flags);
 
 	return ret;
 }
@@ -140,26 +137,20 @@ static void xway_read_buf(struct mtd_inf
 {
 	struct nand_chip *this = mtd->priv;
 	unsigned long nandaddr = (unsigned long) this->IO_ADDR_R;
-	unsigned long flags;
 	int i;
 
-	spin_lock_irqsave(&ebu_lock, flags);
 	for (i = 0; i < len; i++)
 		buf[i] = ltq_r8((void __iomem *)(nandaddr | NAND_READ_DATA));
-	spin_unlock_irqrestore(&ebu_lock, flags);
 }
 
 static void xway_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
 {
 	struct nand_chip *this = mtd->priv;
 	unsigned long nandaddr = (unsigned long) this->IO_ADDR_W;
-	unsigned long flags;
 	int i;
 
-	spin_lock_irqsave(&ebu_lock, flags);
 	for (i = 0; i < len; i++)
 		ltq_w8(buf[i], (void __iomem *)(nandaddr | NAND_WRITE_DATA));
-	spin_unlock_irqrestore(&ebu_lock, flags);
 }
 
 static int xway_nand_probe(struct platform_device *pdev)