Commit 72ea4036 authored Nov 20, 2014 by Scott Branden Committed by Brian Norris Jan 07, 2015

mtd: nand: added nand_shutdown



Add nand_shutdown to wait for current nand operations to finish and prevent
further operations by changing the nand flash state to FL_SHUTDOWN.

This is addressing a problem observed during reboot tests using UBIFS
root file system: NAND erase operations that are in progress during
system reboot/shutdown are causing partial erased blocks. Although UBI should
be able to detect and recover from this error, this change will avoid
the creation of partial erased blocks on reboot in the middle of a NAND erase
operation.

Signed-off-by: Scott Branden <sbranden@broadcom.com>
Tested-by: Scott Branden <sbranden@broadcom.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

parent 3efe41be

drivers/mtd/nand/nand_base.c

+11 −0

Original line number	Diff line number	Diff line
		@@ -2944,6 +2944,16 @@ static void nand_resume(struct mtd_info *mtd)
		__func__);
		}

		/**
		* nand_shutdown - [MTD Interface] Finish the current NAND operation and
		* prevent further operations
		* @mtd: MTD device structure
		*/
		static void nand_shutdown(struct mtd_info *mtd)
		{
		nand_get_device(mtd, FL_SHUTDOWN);
		}

		/* Set default functions */
		static void nand_set_defaults(struct nand_chip *chip, int busw)
		{
		@@ -4146,6 +4156,7 @@ int nand_scan_tail(struct mtd_info *mtd)
		mtd->_unlock = NULL;
		mtd->_suspend = nand_suspend;
		mtd->_resume = nand_resume;
		mtd->_reboot = nand_shutdown;
		mtd->_block_isreserved = nand_block_isreserved;
		mtd->_block_isbad = nand_block_isbad;
		mtd->_block_markbad = nand_block_markbad;

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