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mtd: mtdconcat: map through panic write handler 

Allows a mtdconcat's subdevice->_panic_write to be used for
capturing a mtdoops dump.

Note: The ->_panic_write is mapped through from the first chip
      that is part of the concat virtual device.

Signed-off-by: Matthew Weber <matthew.weber@rockwellcollins.com>
[miquel.raynal@bootlin.com: return err, not void]
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20200602143403.13465-1-matthew.weber@rockwellcollins.com
This commit is contained in:
Matt Weber 2020-06-02 09:34:03 -05:00 committed by Miquel Raynal
parent 3e1b6469f8
commit 3fbe507ebd
1 changed files with 44 additions and 0 deletions
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44
drivers/mtd/mtdconcat.c
View File

@ -102,6 +102,48 @@ concat_read(struct mtd_info *mtd, loff_t from, size_t len,
return -EINVAL;
}
static int
concat_panic_write(struct mtd_info *mtd, loff_t to, size_t len,
size_t * retlen, const u_char * buf)
{
struct mtd_concat *concat = CONCAT(mtd);
int err = -EINVAL;
int i;
for (i = 0; i < concat->num_subdev; i++) {
struct mtd_info *subdev = concat->subdev[i];
size_t size, retsize;
if (to >= subdev->size) {
size = 0;
to -= subdev->size;
continue;
}
if (to + len > subdev->size)
size = subdev->size - to;
else
size = len;
err = mtd_panic_write(subdev, to, size, &retsize, buf);
if (err == -EOPNOTSUPP) {
printk(KERN_ERR "mtdconcat: Cannot write from panic without panic_write\n");
return err;
}
if (err)
break;
*retlen += retsize;
len -= size;
if (len == 0)
break;
err = -EINVAL;
buf += size;
to = 0;
}
return err;
}
static int
concat_write(struct mtd_info *mtd, loff_t to, size_t len,
size_t * retlen, const u_char * buf)
@ -648,6 +690,8 @@ struct mtd_info *mtd_concat_create(struct mtd_info *subdev[], /* subdevices to c
concat->mtd._block_isbad = concat_block_isbad;
if (subdev[0]->_block_markbad)
concat->mtd._block_markbad = concat_block_markbad;
if (subdev[0]->_panic_write)
concat->mtd._panic_write = concat_panic_write;
concat->mtd.ecc_stats.badblocks = subdev[0]->ecc_stats.badblocks;