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mtd: mxc-nand: kill the NAND_MAX_PAGESIZE/NAND_MAX_OOBSIZE

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We kill the NAND_MAX_PAGESIZE/NAND_MAX_OOBSIZE by the following way:
 1.) Before we call the nand_scan_ident, we allocate a temporary buffer
     whose size is PAGE_SIZE.
 2.) After we finish the nand_scan_ident, we have already getten the
     page size and oob size. We will allocate the right buffer size
     again.

Signed-off-by: Huang Shijie <shijie8@gmail.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
This commit is contained in:
Huang Shijie 2013-12-21 00:02:27 +08:00 committed by Brian Norris
parent 2fec386a94
commit a5900554a8
1 changed files with 15 additions and 3 deletions
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18
drivers/mtd/nand/mxc_nand.c
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@ -1399,12 +1399,15 @@ static int mxcnd_probe(struct platform_device *pdev)
int err = 0;
/* Allocate memory for MTD device structure and private data */
host = devm_kzalloc(&pdev->dev, sizeof(struct mxc_nand_host) +
NAND_MAX_PAGESIZE + NAND_MAX_OOBSIZE, GFP_KERNEL);
host = devm_kzalloc(&pdev->dev, sizeof(struct mxc_nand_host),
GFP_KERNEL);
if (!host)
return -ENOMEM;
host->data_buf = (uint8_t *)(host + 1);
/* allocate a temporary buffer for the nand_scan_ident() */
host->data_buf = devm_kzalloc(&pdev->dev, PAGE_SIZE, GFP_KERNEL);
if (!host->data_buf)
return -ENOMEM;
host->dev = &pdev->dev;
/* structures must be linked */
@ -1532,6 +1535,15 @@ static int mxcnd_probe(struct platform_device *pdev)
goto escan;
}
/* allocate the right size buffer now */
devm_kfree(&pdev->dev, (void *)host->data_buf);
host->data_buf = devm_kzalloc(&pdev->dev, mtd->writesize + mtd->oobsize,
GFP_KERNEL);
if (!host->data_buf) {
err = -ENOMEM;
goto escan;
}
/* Call preset again, with correct writesize this time */
host->devtype_data->preset(mtd);