File 0033-pcm-restore-hw-params-on-set-latency-failed.patch of Package alsa

From 77b6be63876ee46a95320e77735d977edeedd44a Mon Sep 17 00:00:00 2001
From: Martin Geier <martin.geier@streamunlimited.com>
Date: Fri, 24 Jul 2015 09:30:57 +0200
Subject: [PATCH 33/49] pcm: restore hw params on set latency failed

When method snd_pcm_set_params sets sample rate to 22050 and latency to 50000
to davinci soc driver method snd_pcm_hw_params_set_buffer_time_near fails
and variable params is already changed in the method so the next method
snd_pcm_hw_params_set_period_time_near fails also.

Signed-off-by: Martin Geier <martin.geier@streamunlimited.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
 src/pcm/pcm.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/pcm/pcm.c b/src/pcm/pcm.c
index bae1d1653904..f5fc728518d8 100644
--- a/src/pcm/pcm.c
+++ b/src/pcm/pcm.c
@@ -8004,7 +8004,7 @@ int snd_pcm_set_params(snd_pcm_t *pcm,
                        int soft_resample,
                        unsigned int latency)
 {
-        snd_pcm_hw_params_t *params;
+        snd_pcm_hw_params_t *params, params_saved;
         snd_pcm_sw_params_t *swparams;
         const char *s = snd_pcm_stream_name(snd_pcm_stream(pcm));
         snd_pcm_uframes_t buffer_size, period_size;
@@ -8057,9 +8057,11 @@ int snd_pcm_set_params(snd_pcm_t *pcm,
 		return -EINVAL;
 	}
 	/* set the buffer time */
+	params_saved = *params;
 	err = INTERNAL(snd_pcm_hw_params_set_buffer_time_near)(pcm, params, &latency, NULL);
 	if (err < 0) {
 	        /* error path -> set period size as first */
+		*params = params_saved;
         	/* set the period time */
         	period_time = latency / 4;
         	err = INTERNAL(snd_pcm_hw_params_set_period_time_near)(pcm, params, &period_time, NULL);
-- 
2.5.0