From 7653fc288a964ce5bb0cff9176444260731d0f90 Mon Sep 17 00:00:00 2001 From: Stefan Agner Date: Tue, 24 Mar 2015 17:54:19 +0100 Subject: [PATCH] mtd: vf610_nfc: mark page as dirty on block erase The driver tries to re-use the page buffer by storing the page number of the current page in the buffer. The page is only read if the requested page number is not currently in the buffer. When a block is erased, the page number is marked as invalid if the erased page equals the one currently in the cache. However, since a erase block consists of multiple pages, also other page numbers could be affected. The commands to reproduce this issue (on a written page): > nand dump 0x800 > nand erase 0x0 0x20000 > nand dump 0x800 The second nand dump command returns the data from the buffer, while in fact the page is erased (0xff). Avoid the hassle to calculate whether the page is affected or not, but set the page buffer unconditionally to invalid instead. Signed-off-by: Stefan Agner --- drivers/mtd/nand/vf610_nfc.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/mtd/nand/vf610_nfc.c b/drivers/mtd/nand/vf610_nfc.c index 928d58b..9de971c 100644 --- a/drivers/mtd/nand/vf610_nfc.c +++ b/drivers/mtd/nand/vf610_nfc.c @@ -369,8 +369,7 @@ static void vf610_nfc_command(struct mtd_info *mtd, unsigned command, break; case NAND_CMD_ERASE1: - if (nfc->page == page) - nfc->page = -1; + nfc->page = -1; vf610_nfc_send_commands(nfc->regs, command, NAND_CMD_ERASE2, ERASE_CMD_CODE); vf610_nfc_addr_cycle(mtd, column, page); -- 2.7.4