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firmware: arm_scmi: Protect device request lookup with RCU

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The SCMI device request notifier looks up protocol OF nodes from the
active_protocols IDR. The IDR lookup can run concurrently with protocol
activation while probe is still registering protocols and creating their
SCMI devices.

Wrap the lookup in an RCU read-side critical section as required by the
IDR API for lockless readers.

Fixes: 53b8c25df7 ("firmware: arm_scmi: Add common notifier helpers")
Reported-by: Sashiko <sashiko-bot@kernel.org>
Link: https://patch.msgid.link/20260714-scmi_core_fixes-v6-9-3afe499d46e3@kernel.org
Signed-off-by: Sudeep Holla <sudeep.holla@kernel.org>
This commit is contained in:
Sudeep Holla 2026-07-14 13:56:28 +01:00
parent a71a3d4d8a
commit e6a0e7a49d
1 changed files with 3 additions and 0 deletions
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3
drivers/firmware/arm_scmi/driver.c
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@ -33,6 +33,7 @@
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/processor.h>
#include <linux/rcupdate.h>
#include <linux/refcount.h>
#include <linux/slab.h>
#include <linux/xarray.h>
@ -2958,7 +2959,9 @@ static int scmi_device_request_notifier(struct notifier_block *nb,
struct scmi_device_id *id_table = data;
struct scmi_info *info = req_nb_to_scmi_info(nb);
rcu_read_lock();
np = idr_find(&info->active_protocols, id_table->protocol_id);
rcu_read_unlock();
if (!np)
return NOTIFY_DONE;