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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>
This commit is contained in:
Peter Hurley 2015-11-27 14:11:03 -05:00 committed by Greg Kroah-Hartman
parent 679e7c2999
commit e661cf7020
1 changed files with 4 additions and 4 deletions
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8
drivers/tty/n_tty.c
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@ -2014,11 +2014,11 @@ static int copy_from_read_buf(struct tty_struct *tty,
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 &&