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JB TsaiandFelix Fietkau
98c13eb564
During device shutdown or removal, a deadlock can occur between the PCIe remove path and the driver's asynchronous reset work. The unregistration path calls napi_disable() before cancelling the reset work. If the reset work runs concurrently, it may re-enable NAPI and schedule it. Because the device is being unregistered, this can lead to NAPI state corruption where NAPI is marked as scheduled but never polled, causing subsequent napi_disable() calls to hang forever. Fix this by: 1. Moving cancel_work_sync(&dev->reset_work) to the very start of mt7925e_unregister_device(), ensuring it is stopped before NAPI is disabled. 2. Setting the MT76_REMOVED flag early in the PCI remove path to prevent new reset work from being queued. 3. Checking MT76_REMOVED in mt7925_mac_reset_work() and aborting the reset early if the device is being removed. Co-developed-by: Fei Shao <[email protected]> Signed-off-by: JB Tsai <[email protected]> Tested-by: Rafael Passos <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Felix Fietkau <[email protected]>