linux-kernel - [PATCH v4 16/17] remoteproc: Properly deal with detach request

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20201218173228.2277032-17-mathieu.poirier@linaro.org>
Date:   Fri, 18 Dec 2020 10:32:27 -0700
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     ohad@...ery.com, bjorn.andersson@...aro.org, robh+dt@...nel.org
Cc:     arnaud.pouliquen@...com, linux-remoteproc@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v4 16/17] remoteproc: Properly deal with detach request

This patch introduces the capability to detach a remote processor
that has been attached to or booted by the remoteproc core.  For
that to happen a rproc::ops::detach() operation need to be
available.

Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
Reviewed-by: Peng Fan <peng.fan@....com>
Reviewed-by: Arnaud Pouliquen <arnaud.pouliquen@...com>
---
 drivers/remoteproc/remoteproc_cdev.c  | 6 ++++++
 drivers/remoteproc/remoteproc_sysfs.c | 6 ++++++
 2 files changed, 12 insertions(+)

diff --git a/drivers/remoteproc/remoteproc_cdev.c b/drivers/remoteproc/remoteproc_cdev.c
index 61541bc7d26c..f7645f289563 100644
--- a/drivers/remoteproc/remoteproc_cdev.c
+++ b/drivers/remoteproc/remoteproc_cdev.c
@@ -43,6 +43,12 @@ static ssize_t rproc_cdev_write(struct file *filp, const char __user *buf, size_
 			return -EINVAL;
 
 		ret = rproc_shutdown(rproc);
+	} else if (!strncmp(cmd, "detach", len)) {
+		if (rproc->state != RPROC_RUNNING &&
+		    rproc->state != RPROC_ATTACHED)
+			return -EINVAL;
+
+		ret = rproc_detach(rproc);
 	} else {
 		dev_err(&rproc->dev, "Unrecognized option\n");
 		ret = -EINVAL;
diff --git a/drivers/remoteproc/remoteproc_sysfs.c b/drivers/remoteproc/remoteproc_sysfs.c
index 298052c9d068..ea7b067fe89a 100644
--- a/drivers/remoteproc/remoteproc_sysfs.c
+++ b/drivers/remoteproc/remoteproc_sysfs.c
@@ -236,6 +236,12 @@ static ssize_t state_store(struct device *dev,
 			return -EINVAL;
 
 		ret = rproc_shutdown(rproc);
+	} else if (sysfs_streq(buf, "detach")) {
+		if (rproc->state != RPROC_RUNNING &&
+		    rproc->state != RPROC_ATTACHED)
+			return -EINVAL;
+
+		ret = rproc_detach(rproc);
 	} else {
 		dev_err(&rproc->dev, "Unrecognised option: %s\n", buf);
 		ret = -EINVAL;
-- 
2.25.1