[PATCH] hw/audio: Remove dead code from ac97_realize

[PATCH] hw/audio: Remove dead code from ac97_realize

[Osama Abdelkader]

Remove unnecessary PCI configuration register initialization that was
marked with TODO comments indicating it's redundant:
- PCI_COMMAND register is already 0x00 by default, no need to override
- PCI_BASE_ADDRESS_0 registers are automatically set by pci_register_bar()

This aligns the code with the pattern used by other PCI audio devices
in QEMU (via-ac97, intel-hda, es1370) and removes 15 lines of dead code.

Signed-off-by: Osama Abdelkader <osama.abdelkader@gmail.com>
---
 hw/audio/ac97.c | 19 -------------------
 1 file changed, 19 deletions(-)

diff --git a/hw/audio/ac97.c b/hw/audio/ac97.c
index be7a39377f..60daa62ea3 100644
--- a/hw/audio/ac97.c
+++ b/hw/audio/ac97.c
@@ -1279,30 +1279,11 @@ static void ac97_realize(PCIDevice *dev, Error **errp)
         return;
     }
 
-    /* TODO: no need to override */
-    c[PCI_COMMAND] = 0x00;      /* pcicmd pci command rw, ro */
-    c[PCI_COMMAND + 1] = 0x00;
-
-    /* TODO: */
     c[PCI_STATUS] = PCI_STATUS_FAST_BACK;      /* pcists pci status rwc, ro */
     c[PCI_STATUS + 1] = PCI_STATUS_DEVSEL_MEDIUM >> 8;
 
     c[PCI_CLASS_PROG] = 0x00;      /* pi programming interface ro */
 
-    /* TODO set when bar is registered. no need to override. */
-    /* nabmar native audio mixer base address rw */
-    c[PCI_BASE_ADDRESS_0] = PCI_BASE_ADDRESS_SPACE_IO;
-    c[PCI_BASE_ADDRESS_0 + 1] = 0x00;
-    c[PCI_BASE_ADDRESS_0 + 2] = 0x00;
-    c[PCI_BASE_ADDRESS_0 + 3] = 0x00;
-
-    /* TODO set when bar is registered. no need to override. */
-      /* nabmbar native audio bus mastering base address rw */
-    c[PCI_BASE_ADDRESS_0 + 4] = PCI_BASE_ADDRESS_SPACE_IO;
-    c[PCI_BASE_ADDRESS_0 + 5] = 0x00;
-    c[PCI_BASE_ADDRESS_0 + 6] = 0x00;
-    c[PCI_BASE_ADDRESS_0 + 7] = 0x00;
-
     c[PCI_INTERRUPT_LINE] = 0x00;      /* intr_ln interrupt line rw */
     c[PCI_INTERRUPT_PIN] = 0x01;      /* intr_pn interrupt pin ro */
 
-- 
2.43.0

Re: [PATCH] hw/audio: Remove dead code from ac97_realize

[Marc-André Lureau]

On Mon, Nov 3, 2025 at 3:20 AM Osama Abdelkader
<osama.abdelkader@gmail.com> wrote:
>
> Remove unnecessary PCI configuration register initialization that was
> marked with TODO comments indicating it's redundant:
> - PCI_COMMAND register is already 0x00 by default, no need to override
> - PCI_BASE_ADDRESS_0 registers are automatically set by pci_register_bar()
>
> This aligns the code with the pattern used by other PCI audio devices
> in QEMU (via-ac97, intel-hda, es1370) and removes 15 lines of dead code.
>
> Signed-off-by: Osama Abdelkader <osama.abdelkader@gmail.com>

Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>

> ---
>  hw/audio/ac97.c | 19 -------------------
>  1 file changed, 19 deletions(-)
>
> diff --git a/hw/audio/ac97.c b/hw/audio/ac97.c
> index be7a39377f..60daa62ea3 100644
> --- a/hw/audio/ac97.c
> +++ b/hw/audio/ac97.c
> @@ -1279,30 +1279,11 @@ static void ac97_realize(PCIDevice *dev, Error **errp)
>          return;
>      }
>
> -    /* TODO: no need to override */
> -    c[PCI_COMMAND] = 0x00;      /* pcicmd pci command rw, ro */
> -    c[PCI_COMMAND + 1] = 0x00;
> -
> -    /* TODO: */
>      c[PCI_STATUS] = PCI_STATUS_FAST_BACK;      /* pcists pci status rwc, ro */
>      c[PCI_STATUS + 1] = PCI_STATUS_DEVSEL_MEDIUM >> 8;
>
>      c[PCI_CLASS_PROG] = 0x00;      /* pi programming interface ro */
>
> -    /* TODO set when bar is registered. no need to override. */
> -    /* nabmar native audio mixer base address rw */
> -    c[PCI_BASE_ADDRESS_0] = PCI_BASE_ADDRESS_SPACE_IO;
> -    c[PCI_BASE_ADDRESS_0 + 1] = 0x00;
> -    c[PCI_BASE_ADDRESS_0 + 2] = 0x00;
> -    c[PCI_BASE_ADDRESS_0 + 3] = 0x00;
> -
> -    /* TODO set when bar is registered. no need to override. */
> -      /* nabmbar native audio bus mastering base address rw */
> -    c[PCI_BASE_ADDRESS_0 + 4] = PCI_BASE_ADDRESS_SPACE_IO;
> -    c[PCI_BASE_ADDRESS_0 + 5] = 0x00;
> -    c[PCI_BASE_ADDRESS_0 + 6] = 0x00;
> -    c[PCI_BASE_ADDRESS_0 + 7] = 0x00;
> -
>      c[PCI_INTERRUPT_LINE] = 0x00;      /* intr_ln interrupt line rw */
>      c[PCI_INTERRUPT_PIN] = 0x01;      /* intr_pn interrupt pin ro */
>
> --
> 2.43.0
>
>


-- 
Marc-André Lureau

Re: [PATCH] hw/audio: Remove dead code from ac97_realize

[Philippe Mathieu-Daudé]

On 3/11/25 00:19, Osama Abdelkader wrote:
> Remove unnecessary PCI configuration register initialization that was
> marked with TODO comments indicating it's redundant:
> - PCI_COMMAND register is already 0x00 by default, no need to override
> - PCI_BASE_ADDRESS_0 registers are automatically set by pci_register_bar()
> 
> This aligns the code with the pattern used by other PCI audio devices
> in QEMU (via-ac97, intel-hda, es1370) and removes 15 lines of dead code.
> 
> Signed-off-by: Osama Abdelkader <osama.abdelkader@gmail.com>
> ---
>   hw/audio/ac97.c | 19 -------------------
>   1 file changed, 19 deletions(-)

Queued, thanks!