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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>
Cc: <linux-remoteproc@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>,
	<linux-stm32@st-md-mailman.stormreply.com>,
	<arnaud.pouliquen@foss.st.com>
Subject: [PATCH v2 6/7] rpmsg: char: No dynamic endpoint management for the default one
Date: Tue, 13 Apr 2021 15:44:57 +0200
Message-ID: <20210413134458.17912-7-arnaud.pouliquen@foss.st.com> (raw)
In-Reply-To: <20210413134458.17912-1-arnaud.pouliquen@foss.st.com>

Do not dynamically manage the default endpoint associated to the rpmsg
device. The ept address must not change.

This update is needed to manage the rpmsg-raw channel. In this
case a default endpoint is used and its address must not change or
been reused by another service.

Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@foss.st.com>
---
 drivers/rpmsg/rpmsg_char.c | 28 +++++++++++++++++++++-------
 1 file changed, 21 insertions(+), 7 deletions(-)

diff --git a/drivers/rpmsg/rpmsg_char.c b/drivers/rpmsg/rpmsg_char.c
index 4606787b7011..fa59abfa8878 100644
--- a/drivers/rpmsg/rpmsg_char.c
+++ b/drivers/rpmsg/rpmsg_char.c
@@ -112,17 +112,26 @@ static int rpmsg_eptdev_open(struct inode *inode, struct file *filp)
 	struct rpmsg_endpoint *ept;
 	struct rpmsg_device *rpdev = eptdev->rpdev;
 	struct device *dev = &eptdev->dev;
+	u32 addr = eptdev->chinfo.src;
 
 	if (eptdev->ept)
 		return -EBUSY;
 
 	get_device(dev);
 
-	ept = rpmsg_create_ept(rpdev, rpmsg_ept_cb, eptdev, eptdev->chinfo);
-	if (!ept) {
-		dev_err(dev, "failed to open %s\n", eptdev->chinfo.name);
-		put_device(dev);
-		return -EINVAL;
+	/*
+	 * The RPMsg device can has been created by a ns announcement. In this
+	 * case a default endpoint has been created. Reuse it to avoid to manage
+	 * a new address on each open/close.
+	 */
+	ept = rpdev->ept;
+	if (!ept || addr != ept->addr) {
+		ept = rpmsg_create_ept(rpdev, rpmsg_ept_cb, eptdev, eptdev->chinfo);
+		if (!ept) {
+			dev_err(dev, "failed to open %s\n", eptdev->chinfo.name);
+			put_device(dev);
+			return -EINVAL;
+		}
 	}
 
 	eptdev->ept = ept;
@@ -134,12 +143,17 @@ static int rpmsg_eptdev_open(struct inode *inode, struct file *filp)
 static int rpmsg_eptdev_release(struct inode *inode, struct file *filp)
 {
 	struct rpmsg_eptdev *eptdev = cdev_to_eptdev(inode->i_cdev);
+	struct rpmsg_device *rpdev = eptdev->rpdev;
 	struct device *dev = &eptdev->dev;
 
-	/* Close the endpoint, if it's not already destroyed by the parent */
+	/*
+	 * Close the endpoint, if it's not already destroyed by the parent and it is not the
+	 * default one.
+	 */
 	mutex_lock(&eptdev->ept_lock);
 	if (eptdev->ept) {
-		rpmsg_destroy_ept(eptdev->ept);
+		if (eptdev->ept != rpdev->ept)
+			rpmsg_destroy_ept(eptdev->ept);
 		eptdev->ept = NULL;
 	}
 	mutex_unlock(&eptdev->ept_lock);
-- 
2.17.1


  parent reply index

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-13 13:44 [PATCH v2 0/7] Restructure the rpmsg char and introduce the rpmsg-raw channel Arnaud Pouliquen
2021-04-13 13:44 ` [PATCH v2 1/7] rpmsg: char: Export eptdev create an destroy functions Arnaud Pouliquen
2021-04-21 17:52   ` Mathieu Poirier
2021-04-22  7:55     ` Arnaud POULIQUEN
2021-04-22 16:29       ` Mathieu Poirier
2021-04-13 13:44 ` [PATCH v2 2/7] rpmsg: Move the rpmsg control device from rpmsg_char to rpmsg_ctrl Arnaud Pouliquen
2021-04-21 18:04   ` Mathieu Poirier
2021-04-22  7:56     ` Arnaud POULIQUEN
2021-04-22 16:32       ` Mathieu Poirier
2021-04-22 16:41         ` Arnaud POULIQUEN
2021-04-13 13:44 ` [PATCH v2 3/7] rpmsg: Update rpmsg_chrdev_register_device function Arnaud Pouliquen
2021-04-21 18:06   ` Mathieu Poirier
2021-04-13 13:44 ` [PATCH v2 4/7] rpmsg: char: Introduce __rpmsg_chrdev_create_eptdev function Arnaud Pouliquen
2021-04-21 17:43   ` Mathieu Poirier
2021-04-21 17:45     ` Mathieu Poirier
2021-04-13 13:44 ` [PATCH v2 5/7] rpmsg: char: Introduce a rpmsg driver for the rpmsg char device Arnaud Pouliquen
2021-04-21 17:40   ` Mathieu Poirier
2021-04-22  7:58     ` Arnaud POULIQUEN
2021-04-22 16:36       ` Mathieu Poirier
2021-04-22 16:53         ` Arnaud POULIQUEN
2021-04-28 13:05         ` Arnaud POULIQUEN
2021-04-13 13:44 ` Arnaud Pouliquen [this message]
2021-04-13 13:44 ` [PATCH v2 7/7] rpmsg: char: Return error if user tries to destroy a default endpoint Arnaud Pouliquen

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