Patchwork [v3] mtd: eLBC NAND: remove elbc_fcm_ctrl->oob_poi

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Submitter Matthew L. Creech
Date July 5, 2011, 11:14 p.m.
Message ID <1309907688-8235-1-git-send-email-mlcreech@gmail.com>
Download mbox | patch
Permalink /patch/103391/
State New
Headers show

Comments

Matthew L. Creech - July 5, 2011, 11:14 p.m.
From: Mike Hench <mhench@elutions.com>

The eLBC NAND driver currently follows up each program/write operation with a
read-back of the page, in order to [ostensibly] fill in ECC data for the
caller. However, the page address used for this read is always -1, so the read
will never work correctly.  Remove this useless (and potentially problematic)
block of code.

v2: elbc_fcm_ctrl->oob_poi is removed entirely, since this code block was the
only place it was actually used.

v3: local 'full_page' variable is no longer used either.

Signed-off-by: Matthew L. Creech <mlcreech@gmail.com>
---
 drivers/mtd/nand/fsl_elbc_nand.c |   33 ++-------------------------------
 1 files changed, 2 insertions(+), 31 deletions(-)
Artem Bityutskiy - July 6, 2011, 7:23 a.m.
On Tue, 2011-07-05 at 19:14 -0400, Matthew L. Creech wrote:
> From: Mike Hench <mhench@elutions.com>
> 
> The eLBC NAND driver currently follows up each program/write operation with a
> read-back of the page, in order to [ostensibly] fill in ECC data for the
> caller. However, the page address used for this read is always -1, so the read
> will never work correctly.  Remove this useless (and potentially problematic)
> block of code.

Pushed to l2-mtd-2.6.git, thanks!

Patch

diff --git a/drivers/mtd/nand/fsl_elbc_nand.c b/drivers/mtd/nand/fsl_elbc_nand.c
index 0bb254c..b4d310f 100644
--- a/drivers/mtd/nand/fsl_elbc_nand.c
+++ b/drivers/mtd/nand/fsl_elbc_nand.c
@@ -75,7 +75,6 @@  struct fsl_elbc_fcm_ctrl {
 	unsigned int use_mdr;    /* Non zero if the MDR is to be set      */
 	unsigned int oob;        /* Non zero if operating on OOB data     */
 	unsigned int counter;	 /* counter for the initializations	  */
-	char *oob_poi;           /* Place to write ECC after read back    */
 };
 
 /* These map to the positions used by the FCM hardware ECC generator */
@@ -435,7 +434,6 @@  static void fsl_elbc_cmdfunc(struct mtd_info *mtd, unsigned int command,
 
 	/* PAGEPROG reuses all of the setup from SEQIN and adds the length */
 	case NAND_CMD_PAGEPROG: {
-		int full_page;
 		dev_vdbg(priv->dev,
 		         "fsl_elbc_cmdfunc: NAND_CMD_PAGEPROG "
 			 "writing %d bytes.\n", elbc_fcm_ctrl->index);
@@ -445,34 +443,12 @@  static void fsl_elbc_cmdfunc(struct mtd_info *mtd, unsigned int command,
 		 * write so the HW generates the ECC.
 		 */
 		if (elbc_fcm_ctrl->oob || elbc_fcm_ctrl->column != 0 ||
-		    elbc_fcm_ctrl->index != mtd->writesize + mtd->oobsize) {
+		    elbc_fcm_ctrl->index != mtd->writesize + mtd->oobsize)
 			out_be32(&lbc->fbcr, elbc_fcm_ctrl->index);
-			full_page = 0;
-		} else {
+		else
 			out_be32(&lbc->fbcr, 0);
-			full_page = 1;
-		}
 
 		fsl_elbc_run_command(mtd);
-
-		/* Read back the page in order to fill in the ECC for the
-		 * caller.  Is this really needed?
-		 */
-		if (full_page && elbc_fcm_ctrl->oob_poi) {
-			out_be32(&lbc->fbcr, 3);
-			set_addr(mtd, 6, page_addr, 1);
-
-			elbc_fcm_ctrl->read_bytes = mtd->writesize + 9;
-
-			fsl_elbc_do_read(chip, 1);
-			fsl_elbc_run_command(mtd);
-
-			memcpy_fromio(elbc_fcm_ctrl->oob_poi + 6,
-				&elbc_fcm_ctrl->addr[elbc_fcm_ctrl->index], 3);
-			elbc_fcm_ctrl->index += 3;
-		}
-
-		elbc_fcm_ctrl->oob_poi = NULL;
 		return;
 	}
 
@@ -752,13 +728,8 @@  static void fsl_elbc_write_page(struct mtd_info *mtd,
                                 struct nand_chip *chip,
                                 const uint8_t *buf)
 {
-	struct fsl_elbc_mtd *priv = chip->priv;
-	struct fsl_elbc_fcm_ctrl *elbc_fcm_ctrl = priv->ctrl->nand;
-
 	fsl_elbc_write_buf(mtd, buf, mtd->writesize);
 	fsl_elbc_write_buf(mtd, chip->oob_poi, mtd->oobsize);
-
-	elbc_fcm_ctrl->oob_poi = chip->oob_poi;
 }
 
 static int fsl_elbc_chip_init(struct fsl_elbc_mtd *priv)