From 4b14f17912052a6963580dfba04781cfe6ccba02 Mon Sep 17 00:00:00 2001 From: Biju Das Date: Wed, 18 Aug 2021 11:14:50 +0100 Subject: [PATCH] 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 Reviewed-by: Lad Prabhakar Link: https://lore.kernel.org/r/20210818101450.15948-1-biju.das.jz@bp.renesas.com Signed-off-by: Mark Brown --- sound/soc/sh/rz-ssi.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-) diff --git a/sound/soc/sh/rz-ssi.c b/sound/soc/sh/rz-ssi.c index f097c77..fa0cc08f 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; -- 2.7.4