ASoC: fsl-ssi: remove unnecessary spinlock

The baudclock_locked variable is only used in functions which
are serialized anyway from the core. No need to have a lock
around the variable, so remove it.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
Tested-By: Michael Grzeschik <mgr@pengutronix.de>
Signed-off-by: Mark Brown <broonie@linaro.org>
(cherry picked from commit d8ced4793f3f114fa82fb423b71c2899caf8b7b0)

diff --git a/sound/soc/fsl/fsl_ssi.c b/sound/soc/fsl/fsl_ssi.c
index 9e9f148cc4064dbfbd1bb7dbf383567f9f52ec30..4fb1af4ec109228315a6f87b6e1cd1bdf2959e00 100644 (file)
--- a/sound/soc/fsl/fsl_ssi.c
+++ b/sound/soc/fsl/fsl_ssi.c
@@ -164,7 +164,6 @@ struct fsl_ssi_private {
        bool baudclk_locked;
        bool use_dual_fifo;
        u8 i2s_mode;
-       spinlock_t baudclk_lock;
        struct clk *baudclk;
        struct clk *clk;
        unsigned int bitclk_freq;
@@ -496,13 +495,9 @@ static int fsl_ssi_startup(struct snd_pcm_substream *substream,
        struct snd_soc_pcm_runtime *rtd = substream->private_data;
        struct fsl_ssi_private *ssi_private =
                snd_soc_dai_get_drvdata(rtd->cpu_dai);
-       unsigned long flags;
 
-       if (!dai->active && !fsl_ssi_is_ac97(ssi_private)) {
-               spin_lock_irqsave(&ssi_private->baudclk_lock, flags);
+       if (!dai->active && !fsl_ssi_is_ac97(ssi_private))
                ssi_private->baudclk_locked = false;
-               spin_unlock_irqrestore(&ssi_private->baudclk_lock, flags);
-       }
 
        /* When using dual fifo mode, it is safer to ensure an even period
         * size. If appearing to an odd number while DMA always starts its
@@ -533,7 +528,7 @@ static int fsl_ssi_set_bclk(struct snd_pcm_substream *substream,
        struct ccsr_ssi __iomem *ssi = ssi_private->ssi;
        int synchronous = ssi_private->cpu_dai_drv.symmetric_rates, ret;
        u32 pm = 999, div2, psr, stccr, mask, afreq, factor, i;
-       unsigned long flags, clkrate, baudrate, tmprate;
+       unsigned long clkrate, baudrate, tmprate;
        u64 sub, savesub = 100000;
        unsigned int freq;
 
@@ -604,18 +599,14 @@ static int fsl_ssi_set_bclk(struct snd_pcm_substream *substream,
        else
                write_ssi_mask(&ssi->srccr, mask, stccr);
 
-       spin_lock_irqsave(&ssi_private->baudclk_lock, flags);
        if (!ssi_private->baudclk_locked) {
                ret = clk_set_rate(ssi_private->baudclk, baudrate);
                if (ret) {
-                       spin_unlock_irqrestore(&ssi_private->baudclk_lock,
-                                       flags);
                        dev_err(cpu_dai->dev, "failed to set baudclk rate\n");
                        return -EINVAL;
                }
                ssi_private->baudclk_locked = true;
        }
-       spin_unlock_irqrestore(&ssi_private->baudclk_lock, flags);
 
        return 0;
 }
@@ -900,7 +891,6 @@ static int fsl_ssi_trigger(struct snd_pcm_substream *substream, int cmd,
        struct snd_soc_pcm_runtime *rtd = substream->private_data;
        struct fsl_ssi_private *ssi_private = snd_soc_dai_get_drvdata(rtd->cpu_dai);
        struct ccsr_ssi __iomem *ssi = ssi_private->ssi;
-       unsigned long flags;
 
        switch (cmd) {
        case SNDRV_PCM_TRIGGER_START:
@@ -921,11 +911,9 @@ static int fsl_ssi_trigger(struct snd_pcm_substream *substream, int cmd,
                        fsl_ssi_rx_config(ssi_private, false);
 
                if (!fsl_ssi_is_ac97(ssi_private) && (read_ssi(&ssi->scr) &
-                                       (CCSR_SSI_SCR_TE | CCSR_SSI_SCR_RE)) == 0) {
-                       spin_lock_irqsave(&ssi_private->baudclk_lock, flags);
+                                       (CCSR_SSI_SCR_TE | CCSR_SSI_SCR_RE)) == 0)
                        ssi_private->baudclk_locked = false;
-                       spin_unlock_irqrestore(&ssi_private->baudclk_lock, flags);
-               }
+
                break;
 
        default:
@@ -1258,7 +1246,6 @@ static int fsl_ssi_probe(struct platform_device *pdev)
                ssi_private->fifo_depth = 8;
 
        ssi_private->baudclk_locked = false;
-       spin_lock_init(&ssi_private->baudclk_lock);
 
        dev_set_drvdata(&pdev->dev, ssi_private);