mtd: introduce a macro for max NAND ID sequence length

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Gitweb:     http://git.infradead.org/?p=mtd-2.6.git;a=commit;h=53552d22bfe1f83f69f18eddae2f1d96249440f3
Commit:     53552d22bfe1f83f69f18eddae2f1d96249440f3
Parent:     ecb42fea59cf2d1e7160c5c7e707120e0e6714db
Author:     Artem Bityutskiy <artem.bityutskiy at linux.intel.com>
AuthorDate: Thu Mar 14 09:57:23 2013 +0200
Committer:  David Woodhouse <David.Woodhouse at intel.com>
CommitDate: Fri Apr 5 13:15:06 2013 +0100

    mtd: introduce a macro for max NAND ID sequence length
    
    Introduce a helpful macro for the maximum NAND ID sequence length instead of
    using the "8" magic number.
    
    Signed-off-by: Artem Bityutskiy <artem.bityutskiy at linux.intel.com>
    Acked-by: Huang Shijie <shijie8 at gmail.com>
    Signed-off-by: David Woodhouse <David.Woodhouse at intel.com>
---
 include/linux/mtd/nand.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index d5903c0..0f78d19 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -546,6 +546,9 @@ struct nand_chip {
 #define NAND_MFR_MACRONIX	0xc2
 #define NAND_MFR_EON		0x92
 
+/* The maximum expected count of bytes in the NAND ID sequence */
+#define NAND_MAX_ID_LEN 8
+
 /*
  * A helper for defining older NAND chips where the second ID byte fully
  * defined the chip, including the geometry (chip size, eraseblock size, page
@@ -593,7 +596,7 @@ struct nand_flash_dev {
 			uint8_t mfr_id;
 			uint8_t dev_id;
 		};
-		uint8_t id[8];
+		uint8_t id[NAND_MAX_ID_LEN];
 	};
 	unsigned int pagesize;
 	unsigned int chipsize;