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mtd: adapt writebufsize calculation for concat 

If different chips with different writebufsize are concatenated,
the writebufsize from the concat device has to be taken from
the device with the largest writebuffer. This writebufsize
is used later on in the UBI layer for the min I/O size.

Signed-off-by: Holger Brunck <holger.brunck@keymile.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Holger Brunck 2011-01-24 17:45:42 +01:00 committed by David Woodhouse
parent cbc6c5e73d
commit 771df61949
1 changed files with 7 additions and 1 deletions
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8
drivers/mtd/mtdconcat.c
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@ -750,6 +750,7 @@ struct mtd_info *mtd_concat_create(struct mtd_info *subdev[], /* subdevices to c
struct mtd_concat *concat;
uint32_t max_erasesize, curr_erasesize;
int num_erase_region;
int max_writebufsize = 0;
printk(KERN_NOTICE "Concatenating MTD devices:\n");
for (i = 0; i < num_devs; i++)
@ -776,7 +777,12 @@ struct mtd_info *mtd_concat_create(struct mtd_info *subdev[], /* subdevices to c
concat->mtd.size = subdev[0]->size;
concat->mtd.erasesize = subdev[0]->erasesize;
concat->mtd.writesize = subdev[0]->writesize;
concat->mtd.writebufsize = subdev[0]->writebufsize;
for (i = 0; i < num_devs; i++)
if (max_writebufsize < subdev[i]->writebufsize)
max_writebufsize = subdev[i]->writebufsize;
concat->mtd.writebufsize = max_writebufsize;
concat->mtd.subpage_sft = subdev[0]->subpage_sft;
concat->mtd.oobsize = subdev[0]->oobsize;
concat->mtd.oobavail = subdev[0]->oobavail;