On 11/22/18 5:47 PM, Takashi Iwai wrote:
On Thu, 22 Nov 2018 11:02:30 +0100,
Oleksandr Andrushchenko wrote:
@@ -214,12 +221,19 @@ static void stream_clear(struct xen_snd_front_pcm_stream_info *stream)
stream->out_frames = 0;
atomic_set(&stream->hw_ptr, 0);
xen_snd_front_evtchnl_pair_clear(stream->evt_pair);
- xen_snd_front_shbuf_clear(&stream->sh_buf);
+ memset(&stream->shbuf, 0, sizeof(stream->shbuf));
+ stream->buffer = NULL;
+ stream->buffer_sz = 0;
+ stream->pages = NULL;
+ stream->num_pages = 0;
}
static void stream_free(struct xen_snd_front_pcm_stream_info *stream)
{
- xen_snd_front_shbuf_free(&stream->sh_buf);
+ xen_front_pgdir_shbuf_unmap(&stream->shbuf);
+ xen_front_pgdir_shbuf_free(&stream->shbuf);
+ free_pages_exact(stream->buffer, stream->buffer_sz);
+ kfree(stream->pages);
stream_clear(stream);
}
@@ -421,10 +435,34 @@ static int alsa_close(struct snd_pcm_substream *substream)
return 0;
}
+static int shbuf_setup_backstore(struct xen_snd_front_pcm_stream_info *stream,
+ size_t buffer_sz)
+{
+ int i;
+
+ stream->buffer_sz = buffer_sz;
+ stream->buffer = alloc_pages_exact(stream->buffer_sz, GFP_KERNEL);
+ if (!stream->buffer)
+ return -ENOMEM;
This keeps the NULL stream->buffer, and then the caller goes to the
error path via stream_free() which will lead to an Oops due to the
unconditional call of free_pages_exact().
You are absolutely right, will fix
Thank you for catching this
thanks,
Takashi
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