Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761565Ab0HFQaA (ORCPT ); Fri, 6 Aug 2010 12:30:00 -0400 Received: from mail-bw0-f46.google.com ([209.85.214.46]:50273 "EHLO mail-bw0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1760111Ab0HFQ36 (ORCPT ); Fri, 6 Aug 2010 12:29:58 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=from:to:cc:subject:date:message-id:x-mailer; b=TkTju38MKpY7+Cw0JUtxALrjQaBFH8sYquNrQIZlVi6fceRQMRS5YZrJcspNHqT7PQ LZEggfdoCw8oTt7KSF+PLvE0Q8N95xwaXVDRC2iFJj09Y4lTyykuZhSF4w1d9hNl75da cq+8ON1Q9P3ERnFL7jxv5iIVx8EhBkTbshPLg= From: Dmitry Eremin-Solenikov To: Greg Kroah-Hartman Cc: linux-kernel@vger.kernel.org Subject: [PATCH 1/2] tty_io: add an API to get device corresponding to tty_struct Date: Fri, 6 Aug 2010 20:29:28 +0400 Message-Id: <1281112169-27086-1-git-send-email-dbaryshkov@gmail.com> X-Mailer: git-send-email 1.7.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2080 Lines: 61 Some device drivers (mostly tty line disciplines) would like to have way to get a struct device instancve corresponding to passed tty_struct. Add respective API call. Signed-off-by: Dmitry Eremin-Solenikov --- drivers/char/tty_io.c | 20 ++++++++++++++++++++ include/linux/tty.h | 1 + 2 files changed, 21 insertions(+), 0 deletions(-) diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c index d71f0fc..43fdeef 100644 --- a/drivers/char/tty_io.c +++ b/drivers/char/tty_io.c @@ -3017,6 +3017,26 @@ dev_t tty_devnum(struct tty_struct *tty) } EXPORT_SYMBOL(tty_devnum); +static int dev_match_devt(struct device *dev, void *data) +{ + dev_t *devt = data; + return dev->devt == *devt; +} + +/** + * tty_get_device - get a device corresponding to tty + * @tty: the struct that describes the tty device + * + * Returns a pointer to the struct device for this tty device + * (or NULL in case of error). + */ +struct device *tty_get_device(struct tty_struct *tty) +{ + dev_t devt = tty_devnum(tty); + return class_find_device(tty_class, NULL, &devt, dev_match_devt); +} +EXPORT_SYMBOL(tty_get_device); + void proc_clear_tty(struct task_struct *p) { unsigned long flags; diff --git a/include/linux/tty.h b/include/linux/tty.h index 931078b..5038433 100644 --- a/include/linux/tty.h +++ b/include/linux/tty.h @@ -451,6 +451,7 @@ extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg); extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg); extern dev_t tty_devnum(struct tty_struct *tty); +struct device *tty_get_device(struct tty_struct *tty); extern void proc_clear_tty(struct task_struct *p); extern struct tty_struct *get_current_tty(void); extern void tty_default_fops(struct file_operations *fops); -- 1.7.1 -- 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/