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
WARNING: multiple messages have this Message-ID (diff)
From: Takashi Iwai <tiwai@suse.de> To: Anton Yakovlev <anton.yakovlev@opensynergy.com> Cc: virtio-dev@lists.oasis-open.org, alsa-devel@alsa-project.org, "Michael S. Tsirkin" <mst@redhat.com>, linux-kernel@vger.kernel.org, Jason Wang <jasowang@redhat.com>, Takashi Iwai <tiwai@suse.com>, virtualization@lists.linux-foundation.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: 90+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-02-22 15:34 [PATCH v5 0/9] ALSA: add virtio sound driver Anton Yakovlev 2021-02-22 15:34 ` [virtio-dev] " Anton Yakovlev 2021-02-22 15:34 ` Anton Yakovlev 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 ` [virtio-dev] " Anton Yakovlev 2021-02-22 15:34 ` Anton Yakovlev 2021-02-22 15:34 ` Anton Yakovlev 2021-02-22 15:34 ` [PATCH v5 2/9] ALSA: virtio: add virtio sound driver Anton Yakovlev 2021-02-22 15:34 ` [virtio-dev] " Anton Yakovlev 2021-02-22 15:34 ` Anton Yakovlev 2021-02-22 15:34 ` Anton Yakovlev 2021-02-25 10:38 ` Takashi Iwai [this message] 2021-02-25 10:38 ` Takashi Iwai 2021-02-25 10:39 ` Takashi Iwai 2021-02-25 10:39 ` Takashi Iwai 2021-02-25 11:51 ` Anton Yakovlev 2021-02-25 11:51 ` [virtio-dev] " Anton Yakovlev 2021-02-25 11:51 ` Anton Yakovlev 2021-02-25 11:51 ` Anton Yakovlev 2021-02-25 12:08 ` Takashi Iwai 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 ` [virtio-dev] " Anton Yakovlev 2021-02-22 15:34 ` Anton Yakovlev 2021-02-22 15:34 ` 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 ` [virtio-dev] " Anton Yakovlev 2021-02-22 15:34 ` Anton Yakovlev 2021-02-22 15:34 ` 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 2021-02-22 15:34 ` [virtio-dev] " Anton Yakovlev 2021-02-22 15:34 ` Anton Yakovlev 2021-02-22 15:34 ` Anton Yakovlev 2021-02-25 10:45 ` Takashi Iwai 2021-02-25 10:45 ` Takashi Iwai 2021-02-22 15:34 ` [PATCH v5 6/9] ALSA: virtio: PCM substream operators Anton Yakovlev 2021-02-22 15:34 ` [virtio-dev] " Anton Yakovlev 2021-02-22 15:34 ` Anton Yakovlev 2021-02-22 15:34 ` Anton Yakovlev 2021-02-25 10:55 ` Takashi Iwai 2021-02-25 10:55 ` Takashi Iwai 2021-02-25 12:14 ` Anton Yakovlev 2021-02-25 12:14 ` [virtio-dev] " Anton Yakovlev 2021-02-25 12:14 ` Anton Yakovlev 2021-02-25 12:14 ` Anton Yakovlev 2021-02-25 12:51 ` Takashi Iwai 2021-02-25 12:51 ` Takashi Iwai 2021-02-25 19:02 ` Michael S. Tsirkin 2021-02-25 19:02 ` [virtio-dev] " Michael S. Tsirkin 2021-02-25 19:02 ` Michael S. Tsirkin 2021-02-25 19:02 ` Michael S. Tsirkin 2021-02-25 20:30 ` Takashi Iwai 2021-02-25 20:30 ` Takashi Iwai 2021-02-25 22:19 ` Anton Yakovlev 2021-02-25 22:19 ` [virtio-dev] " Anton Yakovlev 2021-02-25 22:19 ` Anton Yakovlev 2021-02-25 22:19 ` Anton Yakovlev 2021-02-26 14:23 ` Takashi Iwai 2021-02-26 14:23 ` Takashi Iwai 2021-02-26 20:16 ` Anton Yakovlev 2021-02-26 20:16 ` [virtio-dev] " Anton Yakovlev 2021-02-26 20:16 ` Anton Yakovlev 2021-02-26 20:16 ` Anton Yakovlev 2021-02-26 20:19 ` Anton Yakovlev 2021-02-26 20:19 ` [virtio-dev] " Anton Yakovlev 2021-02-26 20:19 ` Anton Yakovlev 2021-02-26 20:19 ` Anton Yakovlev 2021-02-27 7:50 ` Takashi Iwai 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 ` [virtio-dev] " Anton Yakovlev 2021-02-22 15:34 ` Anton Yakovlev 2021-02-22 15:34 ` 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 ` [virtio-dev] " Anton Yakovlev 2021-02-22 15:34 ` Anton Yakovlev 2021-02-22 15:34 ` Anton Yakovlev 2021-02-22 15:34 ` [PATCH v5 9/9] ALSA: virtio: introduce device suspend/resume support Anton Yakovlev 2021-02-22 15:34 ` [virtio-dev] " Anton Yakovlev 2021-02-22 15:34 ` Anton Yakovlev 2021-02-22 15:34 ` Anton Yakovlev 2021-02-23 12:09 ` [PATCH v5 0/9] ALSA: add virtio sound driver Michael S. Tsirkin 2021-02-23 12:09 ` [virtio-dev] " Michael S. Tsirkin 2021-02-23 12:09 ` Michael S. Tsirkin 2021-02-23 12:33 ` [virtio-dev] " Anton Yakovlev 2021-02-23 12:33 ` Anton Yakovlev 2021-02-23 12:33 ` Anton Yakovlev 2021-02-23 12:59 ` Michael S. Tsirkin 2021-02-23 12:59 ` Michael S. Tsirkin 2021-02-23 12:59 ` Michael S. Tsirkin
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