From a5969cabbb4660eab42b6ef0412cbbd1200cf14d Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Sat, 12 Oct 2024 07:10:09 +0000
Subject: [PATCH] 修改led为gpio
---
kernel/sound/core/pcm_memory.c | 44 ++++++++++++++++++++++++++++++++++++--------
1 files changed, 36 insertions(+), 8 deletions(-)
diff --git a/kernel/sound/core/pcm_memory.c b/kernel/sound/core/pcm_memory.c
index 1918838..3e60a33 100644
--- a/kernel/sound/core/pcm_memory.c
+++ b/kernel/sound/core/pcm_memory.c
@@ -31,20 +31,51 @@
module_param(max_alloc_per_card, ulong, 0644);
MODULE_PARM_DESC(max_alloc_per_card, "Max total allocation bytes per card.");
+static void __update_allocated_size(struct snd_card *card, ssize_t bytes)
+{
+ card->total_pcm_alloc_bytes += bytes;
+}
+
+static void update_allocated_size(struct snd_card *card, ssize_t bytes)
+{
+ mutex_lock(&card->memory_mutex);
+ __update_allocated_size(card, bytes);
+ mutex_unlock(&card->memory_mutex);
+}
+
+static void decrease_allocated_size(struct snd_card *card, size_t bytes)
+{
+ mutex_lock(&card->memory_mutex);
+ WARN_ON(card->total_pcm_alloc_bytes < bytes);
+ __update_allocated_size(card, -(ssize_t)bytes);
+ mutex_unlock(&card->memory_mutex);
+}
+
static int do_alloc_pages(struct snd_card *card, int type, struct device *dev,
size_t size, struct snd_dma_buffer *dmab)
{
int err;
+ /* check and reserve the requested size */
+ mutex_lock(&card->memory_mutex);
if (max_alloc_per_card &&
- card->total_pcm_alloc_bytes + size > max_alloc_per_card)
+ card->total_pcm_alloc_bytes + size > max_alloc_per_card) {
+ mutex_unlock(&card->memory_mutex);
return -ENOMEM;
+ }
+ __update_allocated_size(card, size);
+ mutex_unlock(&card->memory_mutex);
err = snd_dma_alloc_pages(type, dev, size, dmab);
if (!err) {
- mutex_lock(&card->memory_mutex);
- card->total_pcm_alloc_bytes += dmab->bytes;
- mutex_unlock(&card->memory_mutex);
+ /* the actual allocation size might be bigger than requested,
+ * and we need to correct the account
+ */
+ if (dmab->bytes != size)
+ update_allocated_size(card, dmab->bytes - size);
+ } else {
+ /* take back on allocation failure */
+ decrease_allocated_size(card, size);
}
return err;
}
@@ -53,10 +84,7 @@
{
if (!dmab->area)
return;
- mutex_lock(&card->memory_mutex);
- WARN_ON(card->total_pcm_alloc_bytes < dmab->bytes);
- card->total_pcm_alloc_bytes -= dmab->bytes;
- mutex_unlock(&card->memory_mutex);
+ decrease_allocated_size(card, dmab->bytes);
snd_dma_free_pages(dmab);
dmab->area = NULL;
}
--
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