ALSA: fireworks: Use safer way to arrange ring buffer pointer

To reverse a pointer for the ring buffer, subtraction by buffer
size is better than assignment to the beginning of the buffer.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

2 files changed, 2 insertions, 2 deletions

diff --git a/sound/firewire/fireworks/fireworks_hwdep.c b/sound/firewire/fireworks/fireworks_hwdep.c
index 4f8216fb6b62..33df8655fe81 100644
--- a/sound/firewire/fireworks/fireworks_hwdep.c
+++ b/sound/firewire/fireworks/fireworks_hwdep.c
@@ -58,7 +58,7 @@ hwdep_read_resp_buf(struct snd_efw *efw, char __user *buf, long remained,
                         efw->pull_ptr += till_end;
                         if (efw->pull_ptr >= efw->resp_buf +
                                              snd_efw_resp_buf_size)
-                                efw->pull_ptr = efw->resp_buf;
+                                efw->pull_ptr -= snd_efw_resp_buf_size;
 
                         length -= till_end;
                         buf += till_end;
diff --git a/sound/firewire/fireworks/fireworks_transaction.c b/sound/firewire/fireworks/fireworks_transaction.c
index aa56b8ac537c..a6a9e9fd66b9 100644
--- a/sound/firewire/fireworks/fireworks_transaction.c
+++ b/sound/firewire/fireworks/fireworks_transaction.c
@@ -148,7 +148,7 @@ copy_resp_to_buf(struct snd_efw *efw, void *data, size_t length, int *rcode)
 
                 efw->push_ptr += till_end;
                 if (efw->push_ptr >= efw->resp_buf + snd_efw_resp_buf_size)
-                        efw->push_ptr = efw->resp_buf;
+                        efw->push_ptr -= snd_efw_resp_buf_size;
 
                 length -= till_end;
                 data += till_end;