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mtd: harmonize mtd_point interface implementation 

Some MTD drivers return -EINVAL if the 'phys' parameter is not NULL, trying to
convey that they cannot return the physical address. However, this is not very
logical because they still can return the virtual address ('virt'). But some
drivers (lpddr) just ignore the 'phys' parameter instead, which is a more
logical thing to do.

Let's harmonize this and:

1. Always initialize 'virt' and 'phys' to 'NULL' in 'mtd_point()'.
2. Do not return an error if the physical address cannot be found.

So as a result, all drivers will set 'phys' to 'NULL' if it is not supported.
None of the 'mtd_point()' users use 'phys' anyway, so this should not break
anything. I guess we could also just delete this parameter later.

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Artem Bityutskiy 2012-02-08 15:13:26 +02:00 committed by David Woodhouse
parent c3faac4a74
commit 0dd5235f51
5 changed files with 3 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/mtd/devices/mtdram.c
View File

@ -43,9 +43,6 @@ static int ram_erase(struct mtd_info *mtd, struct erase_info *instr)
static int ram_point(struct mtd_info *mtd, loff_t from, size_t len,
size_t *retlen, void **virt, resource_size_t *phys)
{
/* can we return a physical address with this driver? */
if (phys)
return -EINVAL;
*virt = mtd->priv + from;
*retlen = len;
return 0;

4
drivers/mtd/devices/phram.c
View File

@ -51,10 +51,6 @@ static int phram_erase(struct mtd_info *mtd, struct erase_info *instr)
static int phram_point(struct mtd_info *mtd, loff_t from, size_t len,
size_t *retlen, void **virt, resource_size_t *phys)
{
/* can we return a physical address with this driver? */
if (phys)
return -EINVAL;
*virt = mtd->priv + from;
*retlen = len;
return 0;

4
drivers/mtd/devices/pmc551.c
View File

@ -205,10 +205,6 @@ static int pmc551_point(struct mtd_info *mtd, loff_t from, size_t len,
printk(KERN_DEBUG "pmc551_point(%ld, %ld)\n", (long)from, (long)len);
#endif
/* can we return a physical address with this driver? */
if (phys)
return -EINVAL;
soff_hi = from & ~(priv->asize - 1);
soff_lo = from & (priv->asize - 1);

3
drivers/mtd/devices/slram.c
View File

@ -99,9 +99,6 @@ static int slram_point(struct mtd_info *mtd, loff_t from, size_t len,
{
slram_priv_t *priv = mtd->priv;
/* can we return a physical address with this driver? */
if (phys)
return -EINVAL;
*virt = priv->start + from;
*retlen = len;
return(0);

3
drivers/mtd/mtdcore.c
View File

@ -706,6 +706,9 @@ int mtd_point(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen,
void **virt, resource_size_t *phys)
{
*retlen = 0;
*virt = NULL;
if (phys)
*phys = 0;
if (!mtd->_point)
return -EOPNOTSUPP;
if (from < 0 || from > mtd->size || len > mtd->size - from)