[MTD] CORE mtdchar.c: fix off-by-one error in lseek()

Allow lseek(mtdchar_fd, 0, SEEK_END) to succeed, which currently fails
with EINVAL.

lseek(fd, 0, SEEK_END) should result into the same fileposition as
lseek(fd, 0, SEEK_SET) + read(fd, buf, length(fd))

Furthermore, lseek(fd, 0, SEEK_CUR) should return the current file position,
which in case of an encountered EOF should not result in EINVAL

Signed-off-by: Herbert Valerio Riedel <hvr@gnu.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>

diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
index aa18d45b264bb2d3aef9c71792401ac1d7ccece5..9a4b59d925252a554c4840455b6e00455e6aa7df 100644 (file)
--- a/drivers/mtd/mtdchar.c
+++ b/drivers/mtd/mtdchar.c
@@ -78,7 +78,7 @@ static loff_t mtd_lseek (struct file *file, loff_t offset, int orig)
                return -EINVAL;
        }
 
-       if (offset >= 0 && offset < mtd->size)
+       if (offset >= 0 && offset <= mtd->size)
                return file->f_pos = offset;
 
        return -EINVAL;