From ecaa3bda65cefebfce11cc7be4b8d9203f5ce12c Mon Sep 17 00:00:00 2001 From: Jiri Slaby Date: Mon, 5 Mar 2012 14:52:02 +0100 Subject: [PATCH] TTY: ipwireless, fix tty->index handling * do not test if tty->index is in bounds. It is always. * tty->index is not a minor! Fix that. >From now on, let's assume that the parameter of the function is tty index with base being zero. This makes also the code more readable. Factually, there is no real change as tty_driver->minor_start is zero, so the tests are equivalent. But it did not make sense. And if this had changed eventually, it would have caused troubles. Signed-off-by: Jiri Slaby Acked-by: Jiri Kosina Cc: David Sterba Signed-off-by: Greg Kroah-Hartman --- drivers/tty/ipwireless/tty.c | 36 +++++++++++++----------------------- 1 file changed, 13 insertions(+), 23 deletions(-) diff --git a/drivers/tty/ipwireless/tty.c b/drivers/tty/ipwireless/tty.c index 6990b3b649d3..77ceaa9c9e3f 100644 --- a/drivers/tty/ipwireless/tty.c +++ b/drivers/tty/ipwireless/tty.c @@ -90,33 +90,23 @@ static void report_deregistering(struct ipw_tty *tty) tty->index); } -static struct ipw_tty *get_tty(int minor) +static struct ipw_tty *get_tty(int index) { - if (minor < ipw_tty_driver->minor_start - || minor >= ipw_tty_driver->minor_start + - IPWIRELESS_PCMCIA_MINORS) + /* + * The 'ras_raw' channel is only available when 'loopback' mode + * is enabled. + * Number of minor starts with 16 (_RANGE * _RAS_RAW). + */ + if (!ipwireless_loopback && index >= + IPWIRELESS_PCMCIA_MINOR_RANGE * TTYTYPE_RAS_RAW) return NULL; - else { - int minor_offset = minor - ipw_tty_driver->minor_start; - - /* - * The 'ras_raw' channel is only available when 'loopback' mode - * is enabled. - * Number of minor starts with 16 (_RANGE * _RAS_RAW). - */ - if (!ipwireless_loopback && - minor_offset >= - IPWIRELESS_PCMCIA_MINOR_RANGE * TTYTYPE_RAS_RAW) - return NULL; - - return ttys[minor_offset]; - } + + return ttys[index]; } static int ipw_open(struct tty_struct *linux_tty, struct file *filp) { - int minor = linux_tty->index; - struct ipw_tty *tty = get_tty(minor); + struct ipw_tty *tty = get_tty(linux_tty->index); if (!tty) return -ENODEV; @@ -510,7 +500,7 @@ static int add_tty(int j, ipwireless_associate_network_tty(network, secondary_channel_idx, ttys[j]); - if (get_tty(j + ipw_tty_driver->minor_start) == ttys[j]) + if (get_tty(j) == ttys[j]) report_registering(ttys[j]); return 0; } @@ -570,7 +560,7 @@ void ipwireless_tty_free(struct ipw_tty *tty) if (ttyj) { mutex_lock(&ttyj->ipw_tty_mutex); - if (get_tty(j + ipw_tty_driver->minor_start) == ttyj) + if (get_tty(j) == ttyj) report_deregistering(ttyj); ttyj->closing = 1; if (ttyj->linux_tty != NULL) { -- 2.20.1