diff options
| author | Takashi Iwai <tiwai@suse.de> | 2020-06-15 18:00:44 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2020-06-15 18:01:52 +0200 |
| commit | 2a1f3368bff609504cdc984cdb7cef467bb0b2b0 (patch) | |
| tree | 91b48322462746d447147f7448a886e22fbbf768 /sound/core | |
| parent | 28e60dbb83f76b18acade913dfdb029cd908c9b0 (diff) | |
ALSA: memalloc: Make SG-buffer helper usable for continuous buffer, too
We have a few helper functions for making the access to the buffer
address easier on SG-buffer. Those are specific to the buffer that is
allocated with SG-buffer type, and it makes hard to use both SG and
non-SG buffers in the same code.
This patch adds a few simple checks and lets the helpers to deal with
both SG- and continuous buffers gracefully. It's a preliminary step
for the upcoming patch that mimics the buffer type on the fly.
Link: https://lore.kernel.org/r/20200615160045.2703-4-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/core')
| -rw-r--r-- | sound/core/sgbuf.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/sound/core/sgbuf.c b/sound/core/sgbuf.c index c42217e2dd19..29ddb76187e5 100644 --- a/sound/core/sgbuf.c +++ b/sound/core/sgbuf.c @@ -142,6 +142,9 @@ unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab, struct snd_sg_buf *sg = dmab->private_data; unsigned int start, end, pg; + if (!sg) + return size; + start = ofs >> PAGE_SHIFT; end = (ofs + size - 1) >> PAGE_SHIFT; /* check page continuity */ |