linux-kernel - [PATCH 1/2] mtd: nand: omap: Do not use global variables

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Date:	Wed,  1 Oct 2014 16:59:13 +0200
From:	Rostislav Lisovy <lisovy@...il.com>
To:	David Woodhouse <dwmw2@...radead.org>,
	Brian Norris <computersforpeace@...il.com>,
	pekon gupta <pekon@...com>, Tony Lindgren <tony@...mide.com>,
	Roger Quadros <rogerq@...com>, linux-mtd@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Cc:	lisovy@...il.com, michal.vokac@...ap.cz, sojkam1@....cvut.cz,
	Rostislav Lisovy <lisovy@...ica.cz>
Subject: [PATCH 1/2] mtd: nand: omap: Do not use global variables

Since the commit 97a288ba2cfa ("ARM: omap2+: gpmc-nand: Use
dynamic platform_device_alloc()") gpmc-nand driver supports
multiple NAND flash devices connected to the single controller.
Remove global variable to make the code thread-safe.

Signed-off-by: Rostislav Lisovy <lisovy@...ica.cz>
---
 drivers/mtd/nand/omap2.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index 5967b38..24d5c6a 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -146,8 +146,6 @@ static u_char bch8_vector[] = {0xf3, 0xdb, 0x14, 0x16, 0x8b, 0xd2, 0xbe, 0xcc,
 static u_char bch4_vector[] = {0x00, 0x6b, 0x31, 0xdd, 0x41, 0xbc, 0x10};
 #endif
 
-/* oob info generated runtime depending on ecc algorithm and layout selected */
-static struct nand_ecclayout omap_oobinfo;
 
 struct omap_nand_info {
 	struct nand_hw_control		controller;
@@ -1794,7 +1792,7 @@ static int omap_nand_probe(struct platform_device *pdev)
 	}
 
 	/* populate MTD interface based on ECC scheme */
-	ecclayout		= &omap_oobinfo;
+	ecclayout		= kzalloc(sizeof(*ecclayout), GFP_KERNEL);
 	switch (info->ecc_opt) {
 	case OMAP_ECC_HAM1_CODE_SW:
 		nand_chip->ecc.mode = NAND_ECC_SOFT;
-- 
1.9.1

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