1 files changed, 45 insertions, 2 deletions

diff --git a/modules/usbaudio/audio_hal.c b/modules/usbaudio/audio_hal.c
index 39c0fb5c..fe921d69 100644
--- a/modules/usbaudio/audio_hal.c
+++ b/modules/usbaudio/audio_hal.c
@@ -460,6 +460,41 @@ static unsigned int populate_sample_rates_from_profile(const alsa_device_profile
     return num_sample_rates;
 }
 
+static bool are_all_devices_found(unsigned int num_devices_to_find,
+                                  const int cards_to_find[],
+                                  const int devices_to_find[],
+                                  unsigned int num_devices,
+                                  const int cards[],
+                                  const int devices[]) {
+    for (unsigned int i = 0; i < num_devices_to_find; ++i) {
+        unsigned int j = 0;
+        for (; j < num_devices; ++j) {
+            if (cards_to_find[i] == cards[j] && devices_to_find[i] == devices[j]) {
+                break;
+            }
+        }
+        if (j >= num_devices) {
+            return false;
+        }
+    }
+    return true;
+}
+
+static bool are_devices_the_same(unsigned int left_num_devices,
+                                 const int left_cards[],
+                                 const int left_devices[],
+                                 unsigned int right_num_devices,
+                                 const int right_cards[],
+                                 const int right_devices[]) {
+    if (left_num_devices != right_num_devices) {
+        return false;
+    }
+    return are_all_devices_found(left_num_devices, left_cards, left_devices,
+                                 right_num_devices, right_cards, right_devices) &&
+           are_all_devices_found(right_num_devices, right_cards, right_devices,
+                                 left_num_devices, left_cards, left_devices);
+}
+
 /*
  * HAl Functions
  */
@@ -548,10 +583,11 @@ static void stream_dump_alsa_devices(const struct listnode *alsa_devices, int fd
     list_for_each(node, alsa_devices) {
         struct alsa_device_info *device_info =
                 node_to_item(node, struct alsa_device_info, list_node);
-        dprintf(fd, "Output Profile %zu:\n", i);
+        const char* direction = device_info->profile.direction == PCM_OUT ? "Output" : "Input";
+        dprintf(fd, "%s Profile %zu:\n", direction, i);
         profile_dump(&device_info->profile, fd);
 
-        dprintf(fd, "Output Proxy %zu:\n", i);
+        dprintf(fd, "%s Proxy %zu:\n", direction, i);
         proxy_dump(&device_info->proxy, fd);
     }
 }
@@ -1648,6 +1684,13 @@ static int adev_create_audio_patch(struct audio_hw_device *dev,
         saved_devices[num_saved_devices++] = device_info->profile.device;
     }
 
+    if (are_devices_the_same(
+                num_configs, cards, devices, num_saved_devices, saved_cards, saved_devices)) {
+        // The new devices are the same as original ones. No need to update.
+        stream_unlock(lock);
+        return 0;
+    }
+
     device_lock(adev);
     stream_standby_l(alsa_devices, out == NULL ? &in->standby : &out->standby);
     device_unlock(adev);