CVE-2025-38388 — firmware: arm_ffa: Replace mutex with rwlock to avoid sleep in atomic context

Affected: Linux

In the Linux kernel, the following vulnerability has been resolved:

firmware: arm_ffa: Replace mutex with rwlock to avoid sleep in atomic context

The current use of a mutex to protect the notifier hashtable accesses can lead to issues in the atomic context. It results in the below kernel warnings:

To address this, replace the mutex with an rwlock to protect the notifier hashtable accesses. This ensures that read-side locking does not sleep and multiple readers can acquire the lock concurrently, avoiding unnecessary contention and potential deadlocks. Writer access remains exclusive, preserving correctness.…

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CVE-2025-38388 — firmware: arm_ffa: Replace mutex with rwlock to avoid sleep in atomic context