ASoC: tas2781: remove unused acpi_subysystem_id

Commit Message

Gergo Koteles Feb. 6, 2024, 8:25 p.m. UTC

The acpi_subysystem_id is only written and freed, not read, so
unnecessary.

Fixes: ef3bcde75d06 ("ASoC: tas2781: Add tas2781 driver")
CC: [e-mail]
Signed-off-by: Gergo Koteles <[e-mail]>
---
 include/sound/tas2781.h           |  1 -
 sound/pci/hda/tas2781_hda_i2c.c   | 10 ----------
 sound/soc/codecs/tas2781-comlib.c |  1 -
 3 files changed, 12 deletions(-)


base-commit: 610010737f74482a61896596a0116876ecf9e65c

Comments

Greg KH Feb. 7, 2024, 10:02 a.m. UTC | #1

On Tue, Feb 06, 2024 at 09:25:50PM +0100, Gergo Koteles wrote:
> The acpi_subysystem_id is only written and freed, not read, so
> unnecessary.
> 
> Fixes: ef3bcde75d06 ("ASoC: tas2781: Add tas2781 driver")

What does this really "fix"?  It's just a cleanup.

> CC: [e-mail]

Again, what bug is this fixing?

Please read:
    https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
about what should be tagged for stable kernels, which this patch series
does not seem to fix.

thanks,

greg k-h

Gergo Koteles Feb. 7, 2024, 11:24 p.m. UTC | #2

Hi Greg,

On Wed, 2024-02-07 at 10:02 +0000, Greg KH wrote:
> On Tue, Feb 06, 2024 at 09:25:50PM +0100, Gergo Koteles wrote:
> > The acpi_subysystem_id is only written and freed, not read, so
> > unnecessary.
> > 
> > Fixes: ef3bcde75d06 ("ASoC: tas2781: Add tas2781 driver")
> 
> What does this really "fix"?  It's just a cleanup.
> 
> > CC: [e-mail]
> 
> Again, what bug is this fixing?
> 
> Please read:
>     https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
> about what should be tagged for stable kernels, which this patch series
> does not seem to fix.
> 

Yes, you are right, this is not really a bug.
I took the scope of "oh, that's not good" too wide.
Sorry for the noise.

thanks,
Gergo

Patch

diff --git a/include/sound/tas2781.h b/include/sound/tas2781.h
index 9aff384941de..99ca3e401fd1 100644
--- a/include/sound/tas2781.h
+++ b/include/sound/tas2781.h
@@ -103,7 +103,6 @@  struct tasdevice_priv {
 	struct tm tm;
 
 	enum device_catlog_id catlog_id;
-	const char *acpi_subsystem_id;
 	unsigned char cal_binaryname[TASDEVICE_MAX_CHANNELS][64];
 	unsigned char crc8_lkp_tbl[CRC8_TABLE_SIZE];
 	unsigned char coef_binaryname[64];
diff --git a/sound/pci/hda/tas2781_hda_i2c.c b/sound/pci/hda/tas2781_hda_i2c.c
index 1bfb00102a77..02c85084aca5 100644
--- a/sound/pci/hda/tas2781_hda_i2c.c
+++ b/sound/pci/hda/tas2781_hda_i2c.c
@@ -129,18 +129,8 @@  static int tas2781_read_acpi(struct tasdevice_priv *p, const char *hid)
 
 	acpi_dev_free_resource_list(&resources);
 	strscpy(p->dev_name, hid, sizeof(p->dev_name));
-	physdev = get_device(acpi_get_first_physical_node(adev));
 	acpi_dev_put(adev);
 
-	/* No side-effect to the playback even if subsystem_id is NULL*/
-	sub = acpi_get_subsystem_id(ACPI_HANDLE(physdev));
-	if (IS_ERR(sub))
-		sub = NULL;
-
-	p->acpi_subsystem_id = sub;
-
-	put_device(physdev);
-
 	return 0;
 
 err:
diff --git a/sound/soc/codecs/tas2781-comlib.c b/sound/soc/codecs/tas2781-comlib.c
index 5d0e5348b361..3aa81514dad7 100644
--- a/sound/soc/codecs/tas2781-comlib.c
+++ b/sound/soc/codecs/tas2781-comlib.c
@@ -408,7 +408,6 @@  void tasdevice_remove(struct tasdevice_priv *tas_priv)
 {
 	if (gpio_is_valid(tas_priv->irq_info.irq_gpio))
 		gpio_free(tas_priv->irq_info.irq_gpio);
-	kfree(tas_priv->acpi_subsystem_id);
 	mutex_destroy(&tas_priv->codec_lock);
 }
 EXPORT_SYMBOL_GPL(tasdevice_remove);