wifi: iwlegacy: Clear stale interrupts before resuming device

CVE-2024-50234

What is CVE-2024-50234?

A vulnerability exists in the Linux kernel's iwl4965 driver affecting Intel wireless devices, particularly evident when resuming from hibernation. The issue arises from stale interrupts not being cleared before interrupt handling is re-enabled, leading to a race condition. This can cause the wireless hardware to become non-operational upon system resume, potentially disrupting user connectivity and system stability. The recommended fix involves implementing a pre-resume check to clear any lingering interrupts, ensuring a smooth transition back to full operational status.

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