mtd: mtdchar: return expected errors on mmap() call

According both to POSIX.1-2008 and Linux Programmer's Manual mmap()
syscall shouldn't return undocumented ENOSYS, this change replaces
the errno with more appropriate ENODEV and EACCESS.

Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com>
Cc: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
index 9aa0c5e49c1d..2147e733533b 100644
--- a/drivers/mtd/mtdchar.c
+++ b/drivers/mtd/mtdchar.c
@@ -1100,7 +1100,7 @@ static unsigned long mtdchar_get_unmapped_area(struct file *file,
                 return (unsigned long) -EINVAL;
 
         ret = mtd_get_unmapped_area(mtd, len, offset, flags);
-        return ret == -EOPNOTSUPP ? -ENOSYS : ret;
+        return ret == -EOPNOTSUPP ? -ENODEV : ret;
 }
 #endif
 
@@ -1125,9 +1125,9 @@ static int mtdchar_mmap(struct file *file, struct vm_area_struct *vma)
 #endif
                 return vm_iomap_memory(vma, map->phys, map->size);
         }
-        return -ENOSYS;
+        return -ENODEV;
 #else
-        return vma->vm_flags & VM_SHARED ? 0 : -ENOSYS;
+        return vma->vm_flags & VM_SHARED ? 0 : -EACCES;
 #endif
 }