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[v3,4/5] MTD: implement mtd_get_unmapped_area() using the point method

Message ID 20171030184833.20709-5-nicolas.pitre@linaro.org
State New
Headers show
Series unconfuse get_unmapped_area and point/unpoint driver methods | expand

Commit Message

Nicolas Pitre Oct. 30, 2017, 6:48 p.m. UTC 
The mtd->_point method is a superset of mtd->_get_unmapped_area.
Especially in the NOR flash case, the point method ensures the flash
memory is in array (data) mode and that it will stay that way which
is precisely what callers of mtd_get_unmapped_area() would expect.

Implement mtd_get_unmapped_area() in terms of mtd->_point now that all
drivers that provided a _get_unmapped_area method also have the _point
method implemented.

Signed-off-by: Nicolas Pitre <nico@linaro.org>

Reviewed-by: Richard Weinberger <richard@nod.at>

Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com>

---
 drivers/mtd/mtdcore.c | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

-- 
2.9.5


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diff mbox series

Patch

diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index e7ea842ba3..ecb0380158 100644
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -1022,11 +1022,18 @@  EXPORT_SYMBOL_GPL(mtd_unpoint);
 unsigned long mtd_get_unmapped_area(struct mtd_info *mtd, unsigned long len,
 				    unsigned long offset, unsigned long flags)
 {
-	if (!mtd->_get_unmapped_area)
-		return -EOPNOTSUPP;
-	if (offset >= mtd->size || len > mtd->size - offset)
-		return -EINVAL;
-	return mtd->_get_unmapped_area(mtd, len, offset, flags);
+	size_t retlen;
+	void *virt;
+	int ret;
+
+	ret = mtd_point(mtd, offset, len, &retlen, &virt, NULL);
+	if (ret)
+		return ret;
+	if (retlen != len) {
+		mtd_unpoint(mtd, offset, retlen);
+		return -ENOSYS;
+	}
+	return (unsigned long)virt;
 }
 EXPORT_SYMBOL_GPL(mtd_get_unmapped_area);