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| author | Biju Das <biju.das.jz@bp.renesas.com> | 2021-08-18 11:14:50 +0100 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2021-08-19 18:21:22 +0100 |
| commit | 4b14f17912052a6963580dfba04781cfe6ccba02 (patch) | |
| tree | aeb270415d3981a192fbd072bd9d38218a1d1e3a /sound | |
| parent | 2fbbcffea5b6adbfe90ffc842a6b3eb2d7e381ed (diff) | |
| download | linux-stable-4b14f17912052a6963580dfba04781cfe6ccba02.tar.gz linux-stable-4b14f17912052a6963580dfba04781cfe6ccba02.tar.bz2 linux-stable-4b14f17912052a6963580dfba04781cfe6ccba02.zip | |
ASoC: sh: rz-ssi: Improve error handling in rz_ssi_dma_request function
dma_request_chan() returns error pointer in case of failures, but
the rz_ssi_dma_request() checked for NULL pointer instead.
This patch fixes the issue by checking for ERR_PTR() instead of
NULL and sets the DMA pointers to NULL in error case so that ssi
can fallback to PIO mode.
Fixes: 26ac471c5354 ("ASoC: sh: rz-ssi: Add SSI DMAC support")
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Link: https://lore.kernel.org/r/20210818101450.15948-1-biju.das.jz@bp.renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound')
| -rw-r--r-- | sound/soc/sh/rz-ssi.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/sound/soc/sh/rz-ssi.c b/sound/soc/sh/rz-ssi.c index f097c773d413..fa0cc08f70ec 100644 --- a/sound/soc/sh/rz-ssi.c +++ b/sound/soc/sh/rz-ssi.c @@ -185,7 +185,7 @@ rz_ssi_stream_get(struct rz_ssi_priv *ssi, struct snd_pcm_substream *substream) static inline bool rz_ssi_is_dma_enabled(struct rz_ssi_priv *ssi) { - return (ssi->playback.dma_ch || ssi->capture.dma_ch); + return (ssi->playback.dma_ch && (ssi->dma_rt || ssi->capture.dma_ch)); } static int rz_ssi_stream_is_valid(struct rz_ssi_priv *ssi, @@ -676,15 +676,26 @@ static void rz_ssi_release_dma_channels(struct rz_ssi_priv *ssi) static int rz_ssi_dma_request(struct rz_ssi_priv *ssi, struct device *dev) { ssi->playback.dma_ch = dma_request_chan(dev, "tx"); + if (IS_ERR(ssi->playback.dma_ch)) + ssi->playback.dma_ch = NULL; + ssi->capture.dma_ch = dma_request_chan(dev, "rx"); + if (IS_ERR(ssi->capture.dma_ch)) + ssi->capture.dma_ch = NULL; + if (!ssi->playback.dma_ch && !ssi->capture.dma_ch) { ssi->playback.dma_ch = dma_request_chan(dev, "rt"); - if (!ssi->playback.dma_ch) + if (IS_ERR(ssi->playback.dma_ch)) { + ssi->playback.dma_ch = NULL; goto no_dma; + } ssi->dma_rt = true; } + if (!rz_ssi_is_dma_enabled(ssi)) + goto no_dma; + if (ssi->playback.dma_ch && (rz_ssi_dma_slave_config(ssi, ssi->playback.dma_ch, true) < 0)) goto no_dma; |