linux-remoteproc.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Arnaud Pouliquen <arnaud.pouliquen@foss.st.com>
To: Bjorn Andersson <bjorn.andersson@linaro.org>,
	Ohad Ben-Cohen <ohad@wizery.com>,
	Mathieu Poirier <mathieu.poirier@linaro.org>,
	Andy Gross <agross@kernel.org>
Cc: <linux-remoteproc@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>,
	<linux-stm32@st-md-mailman.stormreply.com>,
	<linux-arm-msm@vger.kernel.org>, <arnaud.pouliquen@foss.st.com>
Subject: [PATCH v5 16/16] rpmsg: char: return an error if device already open
Date: Fri, 19 Feb 2021 12:15:01 +0100	[thread overview]
Message-ID: <20210219111501.14261-17-arnaud.pouliquen@foss.st.com> (raw)
In-Reply-To: <20210219111501.14261-1-arnaud.pouliquen@foss.st.com>

The rpmsg_create_ept function is invoked when the device is opened.
As only one endpoint must be created per device. It is not possible to
open the same device twice. But there is nothing to prevent multi open.
Return -EBUSY when device is already opened to have a generic error
instead of relying on the back-end to potentially detect the error.

Without this patch for instance the GLINK driver return -EBUSY while
the virtio bus return -ENOSPC.

Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@foss.st.com>
---
 drivers/rpmsg/rpmsg_char.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/rpmsg/rpmsg_char.c b/drivers/rpmsg/rpmsg_char.c
index 8d3f9d6c20ad..4cd5b79559f0 100644
--- a/drivers/rpmsg/rpmsg_char.c
+++ b/drivers/rpmsg/rpmsg_char.c
@@ -116,6 +116,9 @@ static int rpmsg_eptdev_open(struct inode *inode, struct file *filp)
 	struct device *dev = &eptdev->dev;
 	u32 addr = eptdev->chinfo.src;
 
+	if (eptdev->ept)
+		return -EBUSY;
+
 	get_device(dev);
 
 	/*
-- 
2.17.1


  parent reply	other threads:[~2021-02-19 11:21 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-19 11:14 [PATCH v5 00/16] introduce a generic IOCTL interface for RPMsg channels management Arnaud Pouliquen
2021-02-19 11:14 ` [PATCH v5 01/16] rpmsg: char: rename rpmsg_char_init to rpmsg_chrdev_init Arnaud Pouliquen
2021-02-19 11:14 ` [PATCH v5 02/16] rpmsg: move RPMSG_ADDR_ANY in user API Arnaud Pouliquen
2021-02-19 11:14 ` [PATCH v5 03/16] rpmsg: add short description of the IOCTL defined in UAPI Arnaud Pouliquen
2021-02-19 11:14 ` [PATCH v5 04/16] rpmsg: char: export eptdev create an destroy functions Arnaud Pouliquen
2021-03-02 17:57   ` Mathieu Poirier
2021-03-03 13:22     ` Arnaud POULIQUEN
2021-03-03 16:30       ` Mathieu Poirier
2021-02-19 11:14 ` [PATCH v5 05/16] rpmsg: char: dissociate the control device from the rpmsg class Arnaud Pouliquen
2021-03-02 18:01   ` Mathieu Poirier
2021-03-03 14:58     ` Arnaud POULIQUEN
2021-02-19 11:14 ` [PATCH v5 06/16] rpmsg: move the rpmsg control device from rpmsg_char to rpmsg_ctrl Arnaud Pouliquen
2021-03-02 18:35   ` Mathieu Poirier
2021-03-03 14:59     ` Arnaud POULIQUEN
2021-03-03 16:34       ` Mathieu Poirier
2021-02-19 11:14 ` [PATCH v5 07/16] rpmsg: update rpmsg_chrdev_register_device function Arnaud Pouliquen
2021-03-03 17:01   ` Mathieu Poirier
2021-02-19 11:14 ` [PATCH v5 08/16] rpmsg: glink: add sendto and trysendto ops Arnaud Pouliquen
2021-03-04 19:11   ` Mathieu Poirier
2021-03-05 10:46     ` Arnaud POULIQUEN
2021-03-05 16:55       ` Mathieu Poirier
2021-02-19 11:14 ` [PATCH v5 09/16] rpmsg: smd: " Arnaud Pouliquen
2021-02-19 11:14 ` [PATCH v5 10/16] rpmsg: char: use sendto to specify the message destination address Arnaud Pouliquen
2021-02-19 11:14 ` [PATCH v5 11/16] rpmsg: virtio: register the rpmsg_ctrl device Arnaud Pouliquen
2021-03-03 18:43   ` Mathieu Poirier
2021-03-04  9:20     ` Arnaud POULIQUEN
2021-02-19 11:14 ` [PATCH v5 12/16] rpmsg: ctrl: introduce RPMSG_CREATE_DEV_IOCTL Arnaud Pouliquen
2021-02-19 11:14 ` [PATCH v5 13/16] rpmsg: char: introduce __rpmsg_chrdev_create_eptdev function Arnaud Pouliquen
2021-03-04 18:55   ` Mathieu Poirier
2021-03-05 10:46     ` Arnaud POULIQUEN
2021-03-05 18:01       ` Mathieu Poirier
2021-03-04 19:05   ` Mathieu Poirier
2021-03-05 11:42     ` Arnaud POULIQUEN
2021-02-19 11:14 ` [PATCH v5 14/16] rpmsg: char: introduce a RPMsg driver for the RPMsg char device Arnaud Pouliquen
2021-02-19 11:15 ` [PATCH v5 15/16] rpmsg: char: no dynamic endpoint management for the default one Arnaud Pouliquen
2021-03-04 18:40   ` Mathieu Poirier
2021-03-05 11:09     ` Arnaud POULIQUEN
2021-03-05 17:39       ` Mathieu Poirier
2021-02-19 11:15 ` Arnaud Pouliquen [this message]
2021-03-04 18:45   ` [PATCH v5 16/16] rpmsg: char: return an error if device already open Mathieu Poirier
2021-03-17  9:29 ` [PATCH v5 00/16] introduce a generic IOCTL interface for RPMsg channels management Arnaud POULIQUEN

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210219111501.14261-17-arnaud.pouliquen@foss.st.com \
    --to=arnaud.pouliquen@foss.st.com \
    --cc=agross@kernel.org \
    --cc=bjorn.andersson@linaro.org \
    --cc=linux-arm-msm@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-remoteproc@vger.kernel.org \
    --cc=linux-stm32@st-md-mailman.stormreply.com \
    --cc=mathieu.poirier@linaro.org \
    --cc=ohad@wizery.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).