From: Takashi Iwai <tiwai@suse.de>
Date: Mon, 30 Jan 2017 16:40:04 +0000 (+0100)
Subject: ALSA: x86: Fix possible stale interrupt calls
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=033e925f68c92d058f2be67f941804e7e4f06f7c;p=openwrt%2Fstaging%2Fblogic.git

ALSA: x86: Fix possible stale interrupt calls

Registering the irq handler at the too early place may cause a system
stall because the irq handler may be triggered before the other
initializations.  Move the irq handler registration to the later point.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
---

diff --git a/sound/x86/intel_hdmi_lpe_audio.c b/sound/x86/intel_hdmi_lpe_audio.c
index 54cc30f034f3..f5249b0a4ce4 100644
--- a/sound/x86/intel_hdmi_lpe_audio.c
+++ b/sound/x86/intel_hdmi_lpe_audio.c
@@ -400,16 +400,6 @@ static int hdmi_lpe_audio_probe(struct platform_device *pdev)
 		return -EACCES;
 	}
 
-	/* setup interrupt handler */
-	ret = request_irq(irq, display_pipe_interrupt_handler,
-			0,
-			pdev->name,
-			NULL);
-	if (ret < 0) {
-		dev_err(&hlpe_pdev->dev, "request_irq failed\n");
-		goto error_irq;
-	}
-
 	/* alloc and save context */
 	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
 	if (ctx == NULL) {
@@ -438,11 +428,21 @@ static int hdmi_lpe_audio_probe(struct platform_device *pdev)
 	if (pdata == NULL) {
 		dev_err(&hlpe_pdev->dev, "%s: quit: pdata not allocated by i915!!\n", __func__);
 		ret = -ENOMEM;
-		goto error_probe;
+		goto error_irq;
 	}
 
 	platform_set_drvdata(pdev, ctx);
 
+	/* setup interrupt handler */
+	ret = request_irq(irq, display_pipe_interrupt_handler,
+			0,
+			pdev->name,
+			NULL);
+	if (ret < 0) {
+		dev_err(&hlpe_pdev->dev, "request_irq failed\n");
+		goto error_irq;
+	}
+
 	ret = hdmi_audio_probe(pdev, &ctx->had);
 	if (ret < 0)
 		goto error_probe;
@@ -469,10 +469,10 @@ static int hdmi_lpe_audio_probe(struct platform_device *pdev)
 	return ret;
 
  error_probe:
-	kfree(ctx);
- error_ctx:
 	free_irq(irq, NULL);
  error_irq:
+	kfree(ctx);
+ error_ctx:
 	iounmap(mmio_start);
 	return ret;
 }