Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760864Ab2FDU3C (ORCPT ); Mon, 4 Jun 2012 16:29:02 -0400 Received: from a.ns.miles-group.at ([95.130.255.143]:47836 "EHLO radon.swed.at" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753911Ab2FDU1v (ORCPT ); Mon, 4 Jun 2012 16:27:51 -0400 From: Richard Weinberger To: jslaby@suse.cz Cc: user-mode-linux-devel@lists.sourceforge.net, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk, alan@linux.intel.com, Jeff Dike , Richard Weinberger Subject: [PATCH 2/6] TTY: um/line, use tty from tty_port Date: Mon, 4 Jun 2012 22:27:33 +0200 Message-Id: <1338841657-30358-3-git-send-email-richard@nod.at> X-Mailer: git-send-email 1.7.7.3 In-Reply-To: <1338841657-30358-1-git-send-email-richard@nod.at> References: <1338841657-30358-1-git-send-email-richard@nod.at> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3854 Lines: 130 From: Jiri Slaby This means switching to the tty refcounted model so that we will not race with interrupts. Signed-off-by: Jiri Slaby Cc: Jeff Dike Cc: Richard Weinberger Cc: user-mode-linux-devel@lists.sourceforge.net Signed-off-by: Richard Weinberger --- arch/um/drivers/chan_kern.c | 4 +++- arch/um/drivers/line.c | 25 ++++++++++++++++++------- arch/um/drivers/line.h | 1 - 3 files changed, 21 insertions(+), 9 deletions(-) diff --git a/arch/um/drivers/chan_kern.c b/arch/um/drivers/chan_kern.c index 45e248c..87eebfe 100644 --- a/arch/um/drivers/chan_kern.c +++ b/arch/um/drivers/chan_kern.c @@ -150,9 +150,11 @@ void chan_enable_winch(struct chan *chan, struct tty_struct *tty) static void line_timer_cb(struct work_struct *work) { struct line *line = container_of(work, struct line, task.work); + struct tty_struct *tty = tty_port_tty_get(&line->port); if (!line->throttled) - chan_interrupt(line, line->tty, line->driver->read_irq); + chan_interrupt(line, tty, line->driver->read_irq); + tty_kref_put(tty); } int enable_chan(struct line *line) diff --git a/arch/um/drivers/line.c b/arch/um/drivers/line.c index 482a7bd..fb6e4ea 100644 --- a/arch/um/drivers/line.c +++ b/arch/um/drivers/line.c @@ -19,9 +19,11 @@ static irqreturn_t line_interrupt(int irq, void *data) { struct chan *chan = data; struct line *line = chan->line; + struct tty_struct *tty = tty_port_tty_get(&line->port); if (line) - chan_interrupt(line, line->tty, irq); + chan_interrupt(line, tty, irq); + tty_kref_put(tty); return IRQ_HANDLED; } @@ -333,7 +335,7 @@ static irqreturn_t line_write_interrupt(int irq, void *data) { struct chan *chan = data; struct line *line = chan->line; - struct tty_struct *tty = line->tty; + struct tty_struct *tty; int err; /* @@ -352,10 +354,13 @@ static irqreturn_t line_write_interrupt(int irq, void *data) } spin_unlock(&line->lock); + tty = tty_port_tty_get(&line->port); if (tty == NULL) return IRQ_NONE; tty_wakeup(tty); + tty_kref_put(tty); + return IRQ_HANDLED; } @@ -409,7 +414,7 @@ int line_open(struct line *lines, struct tty_struct *tty) BUG_ON(tty->driver_data); tty->driver_data = line; - line->tty = tty; + tty_port_tty_set(&line->port, tty); err = enable_chan(line); if (err) /* line_close() will be called by our caller */ @@ -449,7 +454,7 @@ void line_close(struct tty_struct *tty, struct file * filp) if (--line->port.count) goto out_unlock; - line->tty = NULL; + tty_port_tty_set(&line->port, NULL); tty->driver_data = NULL; if (line->sigio) { @@ -610,9 +615,15 @@ int line_get_config(char *name, struct line *lines, unsigned int num, char *str, mutex_lock(&line->count_lock); if (!line->valid) CONFIG_CHUNK(str, size, n, "none", 1); - else if (line->tty == NULL) - CONFIG_CHUNK(str, size, n, line->init_str, 1); - else n = chan_config_string(line, str, size, error_out); + else { + struct tty_struct *tty = tty_port_tty_get(&line->port); + if (tty == NULL) { + CONFIG_CHUNK(str, size, n, line->init_str, 1); + } else { + n = chan_config_string(line, str, size, error_out); + tty_kref_put(tty); + } + } mutex_unlock(&line->count_lock); return n; diff --git a/arch/um/drivers/line.h b/arch/um/drivers/line.h index 0e06a1f..5b3d4fb 100644 --- a/arch/um/drivers/line.h +++ b/arch/um/drivers/line.h @@ -33,7 +33,6 @@ struct line_driver { struct line { struct tty_port port; - struct tty_struct *tty; struct mutex count_lock; int valid; -- 1.7.7.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/