mtd: do not duplicate length and offset checks in drivers

We already verify that offset and length are within the MTD device size
in the MTD API functions. Let's remove the duplicated checks in drivers.
This patch only affects the following API's:

'mtd_erase()'
'mtd_point()'
'mtd_unpoint()'
'mtd_get_unmapped_area()'
'mtd_read()'
'mtd_write()'
'mtd_panic_write()'
'mtd_lock()'
'mtd_unlock()'
'mtd_is_locked()'
'mtd_block_isbad()'
'mtd_block_markbad()'

This patch adds a bit of noise by removing too sparse empty lines, but this is
not too bad.

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

1 files changed, 0 insertions, 11 deletions

diff --git a/drivers/mtd/ubi/gluebi.c b/drivers/mtd/ubi/gluebi.c
index 0101dce90c45..b875c2c50d82 100644
--- a/drivers/mtd/ubi/gluebi.c
+++ b/drivers/mtd/ubi/gluebi.c
@@ -174,11 +174,7 @@ static int gluebi_read(struct mtd_info *mtd, loff_t from, size_t len,
         int err = 0, lnum, offs, total_read;
         struct gluebi_device *gluebi;
 
-        if (len < 0 || from < 0 || from + len > mtd->size)
-                return -EINVAL;
-
         gluebi = container_of(mtd, struct gluebi_device, mtd);
-
         lnum = div_u64_rem(from, mtd->erasesize, &offs);
         total_read = len;
         while (total_read) {
@@ -218,9 +214,6 @@ static int gluebi_write(struct mtd_info *mtd, loff_t to, size_t len,
         int err = 0, lnum, offs, total_written;
         struct gluebi_device *gluebi;
 
-        if (len < 0 || to < 0 || len + to > mtd->size)
-                return -EINVAL;
-
         gluebi = container_of(mtd, struct gluebi_device, mtd);
 
         if (!(mtd->flags & MTD_WRITEABLE))
@@ -265,10 +258,6 @@ static int gluebi_erase(struct mtd_info *mtd, struct erase_info *instr)
         int err, i, lnum, count;
         struct gluebi_device *gluebi;
 
-        if (instr->addr < 0 || instr->addr > mtd->size - mtd->erasesize)
-                return -EINVAL;
-        if (instr->len < 0 || instr->addr + instr->len > mtd->size)
-                return -EINVAL;
         if (mtd_mod_by_ws(instr->addr, mtd) || mtd_mod_by_ws(instr->len, mtd))
                 return -EINVAL;