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Diffstat (limited to 'drivers/dma/debug.c')
-rw-r--r--drivers/dma/debug.c22
1 files changed, 20 insertions, 2 deletions
diff --git a/drivers/dma/debug.c b/drivers/dma/debug.c
index b3bfbff9b2..e524dc4127 100644
--- a/drivers/dma/debug.c
+++ b/drivers/dma/debug.c
@@ -12,6 +12,7 @@ struct dma_debug_entry {
dma_addr_t dev_addr;
size_t size;
int direction;
+ bool dev_owned;
};
static const char *dir2name[] = {
@@ -121,6 +122,7 @@ void debug_dma_map(struct device *dev, void *addr,
entry->dev_addr = dev_addr;
entry->size = size;
entry->direction = direction;
+ entry->dev_owned = true;
list_add(&entry->list, &dma_mappings);
@@ -159,9 +161,17 @@ void debug_dma_sync_single_for_cpu(struct device *dev,
struct dma_debug_entry *entry;
entry = dma_debug_entry_find(dev, dma_handle, size);
- if (!entry)
+ if (!entry) {
dma_dev_warn(dev, "sync for CPU of never-mapped %s buffer 0x%llx+0x%zx!\n",
dir2name[direction], (u64)dma_handle, size);
+ return;
+ }
+
+ if (!entry->dev_owned)
+ dma_dev_warn(dev, "unexpected sync for CPU of already CPU-mapped %s buffer 0x%llx+0x%zx!\n",
+ dir2name[direction], (u64)dma_handle, size);
+
+ entry->dev_owned = false;
}
void debug_dma_sync_single_for_device(struct device *dev,
@@ -177,7 +187,15 @@ void debug_dma_sync_single_for_device(struct device *dev,
* corruption
*/
entry = dma_debug_entry_find(dev, dma_handle, size);
- if (!entry)
+ if (!entry) {
dma_dev_warn(dev, "Syncing for device of never-mapped %s buffer 0x%llx+0x%zx!\n",
dir2name[direction], (u64)dma_handle, size);
+ return;
+ }
+
+ if (entry->dev_owned)
+ dma_dev_warn(dev, "unexpected sync for device of already device-mapped %s buffer 0x%llx+0x%zx!\n",
+ dir2name[direction], (u64)dma_handle, size);
+
+ entry->dev_owned = true;
}