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>

3 files changed, 1 insertions, 16 deletions

diff --git a/drivers/mtd/chips/cfi_cmdset_0001.c b/drivers/mtd/chips/cfi_cmdset_0001.c
index 4d04551cffd7..27008ae8f695 100644
--- a/drivers/mtd/chips/cfi_cmdset_0001.c
+++ b/drivers/mtd/chips/cfi_cmdset_0001.c
@@ -1324,7 +1324,7 @@ static int cfi_intelext_point(struct mtd_info *mtd, loff_t from, size_t len,
         int chipnum;
         int ret = 0;
 
-        if (!map->virt || (from + len > mtd->size))
+        if (!map->virt)
                 return -EINVAL;
 
         /* Now lock the chip(s) to POINT state */
diff --git a/drivers/mtd/chips/cfi_cmdset_0020.c b/drivers/mtd/chips/cfi_cmdset_0020.c
index 3861cca97bb0..160402fb65d1 100644
--- a/drivers/mtd/chips/cfi_cmdset_0020.c
+++ b/drivers/mtd/chips/cfi_cmdset_0020.c
@@ -904,12 +904,6 @@ static int cfi_staa_erase_varsize(struct mtd_info *mtd,
         int i, first;
         struct mtd_erase_region_info *regions = mtd->eraseregions;
 
-        if (instr->addr > mtd->size)
-                return -EINVAL;
-
-        if ((instr->len + instr->addr) > mtd->size)
-                return -EINVAL;
-
         /* Check that both start and end of the requested erase are
          * aligned with the erasesize at the appropriate addresses.
          */
@@ -1155,9 +1149,6 @@ static int cfi_staa_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
         if (len & (mtd->erasesize -1))
                 return -EINVAL;
 
-        if ((len + ofs) > mtd->size)
-                return -EINVAL;
-
         chipnum = ofs >> cfi->chipshift;
         adr = ofs - (chipnum << cfi->chipshift);
 
diff --git a/drivers/mtd/chips/cfi_util.c b/drivers/mtd/chips/cfi_util.c
index 8e464054a631..f992418f40a8 100644
--- a/drivers/mtd/chips/cfi_util.c
+++ b/drivers/mtd/chips/cfi_util.c
@@ -173,12 +173,6 @@ int cfi_varsize_frob(struct mtd_info *mtd, varsize_frob_t frob,
         int i, first;
         struct mtd_erase_region_info *regions = mtd->eraseregions;
 
-        if (ofs > mtd->size)
-                return -EINVAL;
-
-        if ((len + ofs) > mtd->size)
-                return -EINVAL;
-
         /* Check that both start and end of the requested erase are
          * aligned with the erasesize at the appropriate addresses.
          */