ASoC: sti: initialize IRQ lock before requesting IRQ

uni_reader_init() registers the shared IRQ before initializing
reader->irq_lock. A pending interrupt can invoke the handler while the
lock is still uninitialized.

Initialize the lock before registering the IRQ so the interrupt path
always sees valid lock state.

Fixes: d05d862ead ("ASoC: STI: Fix null ptr deference in IRQ handler")
Cc: [email protected]
Assisted-by: Codex:GPT-5
Signed-off-by: Runyu Xiao <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Mark Brown <[email protected]>

sound/soc/sti/uniperif_reader.c

@@ -416,6 +416,8 @@ int uni_reader_init(struct platform_device *pdev,
 	else
 		reader->hw = &uni_reader_pcm_hw;
 
+	spin_lock_init(&reader->irq_lock);
+
 	ret = devm_request_irq(&pdev->dev, reader->irq,
 			       uni_reader_irq_handler, IRQF_SHARED,
 			       dev_name(&pdev->dev), reader);
@@ -424,8 +426,6 @@ int uni_reader_init(struct platform_device *pdev,
 		return -EBUSY;
 	}
 
-	spin_lock_init(&reader->irq_lock);
-
 	return 0;
 }
 EXPORT_SYMBOL_GPL(uni_reader_init);