linux-kernel - [PATCH 2/4] ALSA: hda: Stop mangling PCI MSI

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Date:   Fri, 23 Oct 2020 18:23:36 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     tiwai@...e.com
Cc:     Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Kai Vehmanen <kai.vehmanen@...ux.intel.com>,
        Alex Deucher <alexander.deucher@....com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        alsa-devel@...a-project.org (moderated list:SOUND),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 2/4] ALSA: hda: Stop mangling PCI MSI

The code predates 2005, it should be unnecessary now as PCI core handles
MSI much better nowadays.

So stop PCI MSI mangling in suspend/resume callbacks.

Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
---
 sound/pci/hda/hda_intel.c | 15 ---------------
 1 file changed, 15 deletions(-)

diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index 749b88090970..b4aa1dcf1aae 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -1022,13 +1022,11 @@ static int azx_suspend(struct device *dev)
 {
 	struct snd_card *card = dev_get_drvdata(dev);
 	struct azx *chip;
-	struct hdac_bus *bus;
 
 	if (!azx_is_pm_ready(card))
 		return 0;
 
 	chip = card->private_data;
-	bus = azx_bus(chip);
 	snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
 	/* An ugly workaround: direct call of __azx_runtime_suspend() and
 	 * __azx_runtime_resume() for old Intel platforms that suffer from
@@ -1038,14 +1036,6 @@ static int azx_suspend(struct device *dev)
 		__azx_runtime_suspend(chip);
 	else
 		pm_runtime_force_suspend(dev);
-	if (bus->irq >= 0) {
-		free_irq(bus->irq, chip);
-		bus->irq = -1;
-		chip->card->sync_irq = -1;
-	}
-
-	if (chip->msi)
-		pci_disable_msi(chip->pci);
 
 	trace_azx_suspend(chip);
 	return 0;
@@ -1060,11 +1050,6 @@ static int azx_resume(struct device *dev)
 		return 0;
 
 	chip = card->private_data;
-	if (chip->msi)
-		if (pci_enable_msi(chip->pci) < 0)
-			chip->msi = 0;
-	if (azx_acquire_irq(chip, 1) < 0)
-		return -EIO;
 
 	if (chip->driver_caps & AZX_DCAPS_SUSPEND_SPURIOUS_WAKEUP)
 		__azx_runtime_resume(chip, false);
-- 
2.17.1