ASoC: let snd_soc_update_bits() return an error code

Update snd_soc_update_bits() so that it returns a negative error code if the
the read or write operation fails.

Note that currently, a lot of the lower-level read functions have an unsigned
integer return type (and some of them even try to return a negative number),
but this code still appears to work in those cases.

An examination of the code shows that all current callers are compatible with
this change.

Signed-off-by: Timur Tabi <timur@freescale.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 12 insertions, 4 deletions

diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index 2ff708a41119..6cc68140fa67 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -2137,19 +2137,27 @@ EXPORT_SYMBOL_GPL(snd_soc_write);
  *
  * Writes new register value.
  *
- * Returns 1 for change else 0.
+ * Returns 1 for change, 0 for no change, or negative error code.
  */
 int snd_soc_update_bits(struct snd_soc_codec *codec, unsigned short reg,
                                 unsigned int mask, unsigned int value)
 {
         int change;
         unsigned int old, new;
+        int ret;
 
-        old = snd_soc_read(codec, reg);
+        ret = snd_soc_read(codec, reg);
+        if (ret < 0)
+                return ret;
+
+        old = ret;
         new = (old & ~mask) | value;
         change = old != new;
-        if (change)
-                snd_soc_write(codec, reg, new);
+        if (change) {
+                ret = snd_soc_write(codec, reg, new);
+                if (ret < 0)
+                        return ret;
+        }
 
         return change;
 }