Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1762381Ab0HGJze (ORCPT ); Sat, 7 Aug 2010 05:55:34 -0400 Received: from mail-ew0-f46.google.com ([209.85.215.46]:47997 "EHLO mail-ew0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753102Ab0HGJzc (ORCPT ); Sat, 7 Aug 2010 05:55:32 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=from:to:cc:subject:date:message-id:x-mailer:in-reply-to:references; b=iHFGh43gveNv24953xyLSCQ1BQLrahjmyIH7bsb0unhG2Vs/KBDcmkih2W/LwO2BK6 +AJ/N28LhL2qPJwS8GLkaUWOpcwx68xN/vg//xFgPMq3FuihzcIWX47xlY2Qp6FsCUbr Osdt3ciXP2AgmqTsW48EX71pK/jAXVm6xRg8c= 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: Sat, 7 Aug 2010 13:55:02 +0400 Message-Id: <1281174902-6298-1-git-send-email-dbaryshkov@gmail.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <20100806165844.GB3364@suse.de> References: <20100806165844.GB3364@suse.de> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2183 Lines: 62 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 | 21 +++++++++++++++++++++ include/linux/tty.h | 1 + 2 files changed, 22 insertions(+), 0 deletions(-) diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c index d71f0fc..dcdc8fc 100644 --- a/drivers/char/tty_io.c +++ b/drivers/char/tty_io.c @@ -3017,6 +3017,27 @@ 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). Returned device has it's refcount + * incremented by 1, so you should call put_device() after usage. + */ +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/