linux-kernel - [BUG] ALSA: echoaudio: warning when the driver fails to probe

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Date:   Sun, 10 Apr 2022 17:13:55 +0800
From:   Zheyu Ma <zheyuma97@...il.com>
To:     perex@...ex.cz, tiwai@...e.com
Cc:     alsa-devel@...a-project.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [BUG] ALSA: echoaudio: warning when the driver fails to probe

Hello,

I found a bug in echoaudio.c.
When the driver fails at the function snd_echo_create(), it should
release resources requested before, otherwise we will get the
following warning:

[    3.262866] remove_proc_entry: removing non-empty directory
'irq/21', leaking at least 'snd_indigodj'
[    3.263577] WARNING: CPU: 3 PID: 261 at fs/proc/generic.c:717
remove_proc_entry+0x389/0x3f0
[    3.267098] RIP: 0010:remove_proc_entry+0x389/0x3f0
[    3.269976] Call Trace:
[    3.269979]  <TASK>
[    3.269988]  unregister_irq_proc+0x14c/0x170
[    3.269997]  irq_free_descs+0x94/0xe0
[    3.270004]  mp_unmap_irq+0xb6/0x100
[    3.270011]  acpi_unregister_gsi_ioapic+0x27/0x40
[    3.270017]  acpi_pci_irq_disable+0x1d3/0x320
[    3.270025]  pci_disable_device+0x1ad/0x380
[    3.270034]  pcim_release+0x566/0x6d0
[    3.270046]  devres_release_all+0x1f1/0x2c0
[    3.270057]  really_probe+0xe0/0x920

Regards,
Zheyu Ma