[PATCH v4 10/11] firmware: arm_scmi: Reject SCMI drivers while in Raw mode

From: Cristian Marussi
Date: Wed Oct 19 2022 - 16:47:30 EST


Reject SCMI driver registration when SCMI Raw mode support is configured,
so as to avoid interferences between the SCMI Raw mode transactions and the
normal SCMI stack operations.

Signed-off-by: Cristian Marussi <cristian.marussi@xxxxxxx>
---
drivers/firmware/arm_scmi/driver.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c
index b504b5cdc55f..3e5539987443 100644
--- a/drivers/firmware/arm_scmi/driver.c
+++ b/drivers/firmware/arm_scmi/driver.c
@@ -2365,6 +2365,12 @@ int scmi_protocol_device_request(const struct scmi_device_id *id_table)
pr_debug("Requesting SCMI device (%s) for protocol %x\n",
id_table->name, id_table->protocol_id);

+ if (IS_ENABLED(CONFIG_ARM_SCMI_RAW_MODE_SUPPORT)) {
+ pr_warn("SCMI Raw mode active. Rejecting '%s'/0x%02X\n",
+ id_table->name, id_table->protocol_id);
+ return -EINVAL;
+ }
+
/*
* Search for the matching protocol rdev list and then search
* of any existent equally named device...fails if any duplicate found.
--
2.34.1