From: Takashi Iwai <tiwai@suse.de>
To: Anton Yakovlev <anton.yakovlev@opensynergy.com>
Cc: <virtualization@lists.linux-foundation.org>,
<alsa-devel@alsa-project.org>, <virtio-dev@lists.oasis-open.org>,
"Michael S. Tsirkin" <mst@redhat.com>,
Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.com>,
Jason Wang <jasowang@redhat.com>, <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v5 2/9] ALSA: virtio: add virtio sound driver
Date: Thu, 25 Feb 2021 11:38:35 +0100 [thread overview]
Message-ID: <s5h7dmwqvo4.wl-tiwai@suse.de> (raw)
In-Reply-To: <20210222153444.348390-3-anton.yakovlev@opensynergy.com>
On Mon, 22 Feb 2021 16:34:37 +0100,
Anton Yakovlev wrote:
> +static int virtsnd_find_vqs(struct virtio_snd *snd)
> +{
> + struct virtio_device *vdev = snd->vdev;
> + vq_callback_t *callbacks[VIRTIO_SND_VQ_MAX] = {
> + [VIRTIO_SND_VQ_EVENT] = virtsnd_event_notify_cb
> + };
> + const char *names[VIRTIO_SND_VQ_MAX] = {
Shouldn't be static?
Also it's often const char * const names[] = { ... }
unless you overwrite something.
> +/**
> + * virtsnd_reset_fn() - Kernel worker's function to reset the device.
> + * @work: Reset device work.
> + *
> + * Context: Process context.
> + */
> +static void virtsnd_reset_fn(struct work_struct *work)
> +{
> + struct virtio_snd *snd =
> + container_of(work, struct virtio_snd, reset_work);
> + struct virtio_device *vdev = snd->vdev;
> + struct device *dev = &vdev->dev;
> + int rc;
> +
> + dev_info(dev, "sound device needs reset\n");
> +
> + /*
> + * It seems that the only way to properly reset the device is to remove
> + * and re-create the ALSA sound card device.
> + */
> + rc = device_reprobe(dev);
> + if (rc)
> + dev_err(dev, "failed to reprobe sound device: %d\n", rc);
Now I'm wondering whether it's safe to do that from this place.
Basically device_reprobe() unbinds the device that releases the full
resources once including the devm_* stuff. And this work itself is in
a part of devm allocated resource, so it'll be released there. That
said, we might hit use-after-free... This needs to be verified.
thanks,
Takashi
next prev parent reply other threads:[~2021-02-25 10:51 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20210222153444.348390-1-anton.yakovlev@opensynergy.com>
2021-02-22 15:34 ` [PATCH v5 1/9] uapi: virtio_ids: add a sound device type ID from OASIS spec Anton Yakovlev
2021-02-22 15:34 ` [PATCH v5 2/9] ALSA: virtio: add virtio sound driver Anton Yakovlev
2021-02-25 10:38 ` Takashi Iwai [this message]
2021-02-25 10:39 ` Takashi Iwai
2021-02-25 11:51 ` Anton Yakovlev
2021-02-25 12:08 ` Takashi Iwai
2021-02-22 15:34 ` [PATCH v5 3/9] ALSA: virtio: handling control messages Anton Yakovlev
2021-02-22 15:34 ` [PATCH v5 4/9] ALSA: virtio: build PCM devices and substream hardware descriptors Anton Yakovlev
2021-02-22 15:34 ` [PATCH v5 5/9] ALSA: virtio: handling control and I/O messages for the PCM device Anton Yakovlev
2021-02-25 10:45 ` Takashi Iwai
2021-02-22 15:34 ` [PATCH v5 6/9] ALSA: virtio: PCM substream operators Anton Yakovlev
2021-02-25 10:55 ` Takashi Iwai
2021-02-25 12:14 ` Anton Yakovlev
2021-02-25 12:51 ` Takashi Iwai
2021-02-25 19:02 ` Michael S. Tsirkin
2021-02-25 20:30 ` Takashi Iwai
2021-02-25 22:19 ` Anton Yakovlev
2021-02-26 14:23 ` Takashi Iwai
2021-02-26 20:16 ` Anton Yakovlev
2021-02-26 20:19 ` Anton Yakovlev
2021-02-27 7:50 ` Takashi Iwai
2021-02-22 15:34 ` [PATCH v5 7/9] ALSA: virtio: introduce jack support Anton Yakovlev
2021-02-22 15:34 ` [PATCH v5 8/9] ALSA: virtio: introduce PCM channel map support Anton Yakovlev
2021-02-22 15:34 ` [PATCH v5 9/9] ALSA: virtio: introduce device suspend/resume support Anton Yakovlev
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