From 7fdc28931176a17ef0bdc5d35742925a155533c4 Mon Sep 17 00:00:00 2001 From: Jiri Slaby Date: Wed, 20 Apr 2011 10:43:14 +0200 Subject: [PATCH] Char: nozomi, remove useless tty_sem tty_sem used to protect tty open count. This was removed in 33dd474a but the lock remained in place. So remove it completely as it protects nothing now. Also this solves Mac's problem with inatomic operation called from atomic context (ppp): BUG: scheduling while atomic: firefox-bin/1992/0x10000800 Modules linked in: ... Pid: 1992, comm: firefox-bin Not tainted 2.6.38 #1 Call Trace: ... [] ? mutex_lock+0xe/0x21 [] ? ntty_write+0x5d/0x192 [nozomi] [] ? __mod_timer.clone.30+0xbe/0xcc [] ? check_preempt_curr+0x60/0x6d [] ? __nf_ct_refresh_acct+0x75/0xbe [] ? ppp_async_push+0xa9/0x3bd [ppp_async] [] ? ppp_async_send+0x34/0x40 [ppp_async] [] ? ppp_push+0x6c/0x4f9 [ppp_generic] ... Signed-off-by: Jiri Slaby Reported-by: Mac Tested-by: Gerald Pfeifer Reviewed-by: Jack Stone Cc: Alan Cox Signed-off-by: Greg Kroah-Hartman --- drivers/tty/nozomi.c | 12 ++---------- 1 file changed, 2 insertions(+), 10 deletions(-) diff --git a/drivers/tty/nozomi.c b/drivers/tty/nozomi.c index c34d622dace4..b1aecc7bb32a 100644 --- a/drivers/tty/nozomi.c +++ b/drivers/tty/nozomi.c @@ -364,8 +364,6 @@ struct port { u8 toggle_ul; u16 token_dl; - /* mutex to ensure one access patch to this port */ - struct mutex tty_sem; wait_queue_head_t tty_wait; struct async_icount tty_icount; @@ -1474,7 +1472,6 @@ static int __devinit nozomi_card_init(struct pci_dev *pdev, struct device *tty_dev; struct port *port = &dc->port[i]; port->dc = dc; - mutex_init(&port->tty_sem); tty_port_init(&port->port); port->port.ops = &noz_tty_port_ops; tty_dev = tty_register_device(ntty_driver, dc->index_start + i, @@ -1688,8 +1685,6 @@ static int ntty_write(struct tty_struct *tty, const unsigned char *buffer, if (!dc || !port) return -ENODEV; - mutex_lock(&port->tty_sem); - rval = kfifo_in(&port->fifo_ul, (unsigned char *)buffer, count); /* notify card */ @@ -1714,7 +1709,6 @@ static int ntty_write(struct tty_struct *tty, const unsigned char *buffer, spin_unlock_irqrestore(&dc->spin_mutex, flags); exit: - mutex_unlock(&port->tty_sem); return rval; } @@ -1733,11 +1727,9 @@ static int ntty_write_room(struct tty_struct *tty) int room = 4096; const struct nozomi *dc = get_dc_by_tty(tty); - if (dc) { - mutex_lock(&port->tty_sem); + if (dc) room = kfifo_avail(&port->fifo_ul); - mutex_unlock(&port->tty_sem); - } + return room; } -- GitLab