[PATCH v2 1/7] sound: avoid endless loop

[Heinrich Schuchardt]

'sound play 1 100000' results in an endless loop on the sandbox.

If the frequency exceeds half the sampling rate, zero out the output
buffer.

Fixes: 511ed5fdd389 ("SOUND: SAMSUNG: Add I2S driver")
Signed-off-by: Heinrich Schuchardt <heinrich.schucha...@canonical.com>
---
v2:
        no change
---
 drivers/sound/sound.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/sound/sound.c b/drivers/sound/sound.c
index 041dfdccfe..c0fc50c99d 100644
--- a/drivers/sound/sound.c
+++ b/drivers/sound/sound.c
@@ -15,7 +15,10 @@ void sound_create_square_wave(uint sample_rate, unsigned 
short *data, int size,
        const int period = freq ? sample_rate / freq : 0;
        const int half = period / 2;
 
-       assert(freq);
+       if (!half) {
+               memset(data, 0, size);
+               return;
+       }
 
        /* Make sure we don't overflow our buffer */
        if (size % 2)
-- 
2.37.2