linux-kernel - [PATCH v2 02/11] ALSA: hdac: Fix codec name after machine driver is unloaded and reloaded

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Date:   Mon, 17 Jun 2019 13:36:35 +0200
From:   Amadeusz Sławiński 
        <amadeuszx.slawinski@...ux.intel.com>
To:     alsa-devel@...a-project.org
Cc:     Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Jie Yang <yang.jie@...ux.intel.com>,
        Cezary Rojewski <cezary.rojewski@...el.com>,
        linux-kernel@...r.kernel.org,
        Amadeusz Sławiński 
        <amadeuszx.slawinski@...ux.intel.com>
Subject: [PATCH v2 02/11] ALSA: hdac: Fix codec name after machine driver is unloaded and reloaded

Currently on each driver reload internal counter is being increased. It
causes failure to enumerate driver devices, as they have hardcoded:
.codec_name = "ehdaudio0D2",
As there is currently no devices with multiple hda codecs and there is
currently no established way to reliably differentiate, between them,
always assign bus->idx = 0;

This fixes a problem when we unload and reload machine driver idx gets
incremented, so .codec_name would've needed to be set to "ehdaudio1D2"
after first reload and so on.

Signed-off-by: Amadeusz Sławiński <amadeuszx.slawinski@...ux.intel.com>
---
 sound/hda/ext/hdac_ext_bus.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/sound/hda/ext/hdac_ext_bus.c b/sound/hda/ext/hdac_ext_bus.c
index a3a113ef5d56..4f9f1d2a2ec5 100644
--- a/sound/hda/ext/hdac_ext_bus.c
+++ b/sound/hda/ext/hdac_ext_bus.c
@@ -85,7 +85,6 @@ int snd_hdac_ext_bus_init(struct hdac_bus *bus, struct device *dev,
 			const struct hdac_ext_bus_ops *ext_ops)
 {
 	int ret;
-	static int idx;
 
 	/* check if io ops are provided, if not load the defaults */
 	if (io_ops == NULL)
@@ -96,7 +95,12 @@ int snd_hdac_ext_bus_init(struct hdac_bus *bus, struct device *dev,
 		return ret;
 
 	bus->ext_ops = ext_ops;
-	bus->idx = idx++;
+	/* FIXME:
+	 * Currently only one bus is supported, if there is device with more
+	 * buses, bus->idx should be greater than 0, but there needs to be a
+	 * reliable way to always assign same number.
+	 */
+	bus->idx = 0;
 	bus->cmd_dma_state = true;
 
 	return 0;
-- 
2.17.1