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From: Sudeep Holla <sudeep.holla@arm.com>
To: linux-arm-kernel@lists.infradead.org
Cc: Sudeep Holla <sudeep.holla@arm.com>,
	Cristian Marussi <cristian.marussi@arm.com>,
	Rob Herring <robh+dt@kernel.org>,
	Kevin Hilman <khilman@baylibre.com>,
	Neil Armstrong <narmstrong@baylibre.com>,
	Jerome Brunet <jbrunet@baylibre.com>,
	Florian Fainelli <f.fainelli@gmail.com>,
	Jim Quinlan <jim2101024@gmail.com>,
	Etienne Carriere <etienne.carriere@linaro.org>
Subject: [RESEND PATCH 2/2] firmware: arm_scmi: Add compatibility checks for shmem node
Date: Wed,  2 Jun 2021 08:38:51 +0100	[thread overview]
Message-ID: <20210602073851.1005607-2-sudeep.holla@arm.com> (raw)
In-Reply-To: <20210602073851.1005607-1-sudeep.holla@arm.com>

The shared memory node used for communication between the firmware and
the OS should be compatible with "arm,scmi-shmem". Add the check for the
same while parsing the node before fetching the memory regions.

Cc: Rob Herring <robh+dt@kernel.org>
Cc: Cristian Marussi <cristian.marussi@arm.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: Jim Quinlan <jim2101024@gmail.com>
Cc: Etienne Carriere <etienne.carriere@linaro.org>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
---
 drivers/firmware/arm_scmi/mailbox.c | 3 +++
 drivers/firmware/arm_scmi/smc.c     | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/drivers/firmware/arm_scmi/mailbox.c b/drivers/firmware/arm_scmi/mailbox.c
index 4626404be541..e3dcb58314ae 100644
--- a/drivers/firmware/arm_scmi/mailbox.c
+++ b/drivers/firmware/arm_scmi/mailbox.c
@@ -69,6 +69,9 @@ static int mailbox_chan_setup(struct scmi_chan_info *cinfo, struct device *dev,
 		return -ENOMEM;
 
 	shmem = of_parse_phandle(cdev->of_node, "shmem", idx);
+	if (!of_device_is_compatible(shmem, "arm,scmi-shmem"))
+		return -ENXIO;
+
 	ret = of_address_to_resource(shmem, 0, &res);
 	of_node_put(shmem);
 	if (ret) {
diff --git a/drivers/firmware/arm_scmi/smc.c b/drivers/firmware/arm_scmi/smc.c
index fcbe2677f84b..bed5596c7209 100644
--- a/drivers/firmware/arm_scmi/smc.c
+++ b/drivers/firmware/arm_scmi/smc.c
@@ -76,6 +76,9 @@ static int smc_chan_setup(struct scmi_chan_info *cinfo, struct device *dev,
 		return -ENOMEM;
 
 	np = of_parse_phandle(cdev->of_node, "shmem", 0);
+	if (!of_device_is_compatible(np, "arm,scmi-shmem"))
+		return -ENXIO;
+
 	ret = of_address_to_resource(np, 0, &res);
 	of_node_put(np);
 	if (ret) {
-- 
2.25.1


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  reply	other threads:[~2021-06-02  8:28 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-02  7:38 [RESEND PATCH 1/2] firmware: arm_scpi: Add compatibility checks for shmem node Sudeep Holla
2021-06-02  7:38 ` Sudeep Holla [this message]
2021-06-03 12:53   ` [RESEND PATCH 2/2] firmware: arm_scmi: " Cristian Marussi
2021-06-04 17:14   ` Florian Fainelli
2021-06-03 12:52 ` [RESEND PATCH 1/2] firmware: arm_scpi: " Cristian Marussi
2021-06-04  8:56 ` Sudeep Holla

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