n_tty: Clarify copy_from_read_buf()
Add a temporary for the computed source address and substitute
where appropriate. No functional change.
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index b2b01d5..bc613b8 100644
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -2014,11 +2014,11 @@
n = min(head - ldata->read_tail, N_TTY_BUF_SIZE - tail);
n = min(*nr, n);
if (n) {
- retval = copy_to_user(*b, read_buf_addr(ldata, tail), n);
+ const unsigned char *from = read_buf_addr(ldata, tail);
+ retval = copy_to_user(*b, from, n);
n -= retval;
- is_eof = n == 1 && read_buf(ldata, tail) == EOF_CHAR(tty);
- tty_audit_add_data(tty, read_buf_addr(ldata, tail), n,
- ldata->icanon);
+ is_eof = n == 1 && *from == EOF_CHAR(tty);
+ tty_audit_add_data(tty, from, n, ldata->icanon);
smp_store_release(&ldata->read_tail, ldata->read_tail + n);
/* Turn single EOF into zero-length read */
if (L_EXTPROC(tty) && ldata->icanon && is_eof &&