linux-kernel - [PATCH 2/2] firmware: arm_scmi: add missing spinlock documentation

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Message-ID: <20250901161207.2501078-3-artyom.shimko@gmail.com>
Date: Mon,  1 Sep 2025 19:12:04 +0300
From: Artem Shimko <artyom.shimko@...il.com>
To: Sudeep Holla <sudeep.holla@....com>,
	Cristian Marussi <cristian.marussi@....com>
Cc: Artem Shimko <artyom.shimko@...il.com>,
	arm-scmi@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] firmware: arm_scmi: add missing spinlock documentation

Adds a missing comment for xfer_lock spinlock in struct scmi_xfers_info.
The spinlock protects access to the xfer buffers and transfer allocation
mechanism, preventing race conditions in concurrent access scenarios.

Signed-off-by: Artem Shimko <artyom.shimko@...il.com>
---
 drivers/firmware/arm_scmi/driver.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c
index bd56a877fdfc..6828392152f4 100644
--- a/drivers/firmware/arm_scmi/driver.c
+++ b/drivers/firmware/arm_scmi/driver.c
@@ -76,6 +76,7 @@ static struct dentry *scmi_top_dentry;
  */
 struct scmi_xfers_info {
 	unsigned long *xfer_alloc_table;
+	/* Protects access to the xfer buffers */
 	spinlock_t xfer_lock;
 	int max_msg;
 	struct hlist_head free_xfers;
-- 
2.43.0