1 files changed, 57 insertions, 9 deletions

diff --git a/lib/dma-debug.c b/lib/dma-debug.c
index d84beb994f36..5e396accd3d0 100644
--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -45,6 +45,12 @@ enum {
         dma_debug_coherent,
 };
 
+enum map_err_types {
+        MAP_ERR_CHECK_NOT_APPLICABLE,
+        MAP_ERR_NOT_CHECKED,
+        MAP_ERR_CHECKED,
+};
+
 #define DMA_DEBUG_STACKTRACE_ENTRIES 5
 
 struct dma_debug_entry {
@@ -57,6 +63,7 @@ struct dma_debug_entry {
         int              direction;
         int              sg_call_ents;
         int              sg_mapped_ents;
+        enum map_err_types  map_err_type;
 #ifdef CONFIG_STACKTRACE
         struct           stack_trace stacktrace;
         unsigned long    st_entries[DMA_DEBUG_STACKTRACE_ENTRIES];
@@ -114,6 +121,12 @@ static struct device_driver *current_driver                    __read_mostly;
 
 static DEFINE_RWLOCK(driver_name_lock);
 
+static const char *const maperr2str[] = {
+        [MAP_ERR_CHECK_NOT_APPLICABLE] = "dma map error check not applicable",
+        [MAP_ERR_NOT_CHECKED] = "dma map error not checked",
+        [MAP_ERR_CHECKED] = "dma map error checked",
+};
+
 static const char *type2name[4] = { "single", "page",
                                     "scather-gather", "coherent" };
 
@@ -376,11 +389,12 @@ void debug_dma_dump_mappings(struct device *dev)
                 list_for_each_entry(entry, &bucket->list, list) {
                         if (!dev || dev == entry->dev) {
                                 dev_info(entry->dev,
-                                         "%s idx %d P=%Lx D=%Lx L=%Lx %s\n",
+                                         "%s idx %d P=%Lx D=%Lx L=%Lx %s %s\n",
                                          type2name[entry->type], idx,
                                          (unsigned long long)entry->paddr,
                                          entry->dev_addr, entry->size,
-                                         dir2name[entry->direction]);
+                                         dir2name[entry->direction],
+                                         maperr2str[entry->map_err_type]);
                         }
                 }
 
@@ -844,16 +858,16 @@ static void check_unmap(struct dma_debug_entry *ref)
         struct hash_bucket *bucket;
         unsigned long flags;
 
-        if (dma_mapping_error(ref->dev, ref->dev_addr)) {
-                err_printk(ref->dev, NULL, "DMA-API: device driver tries "
-                           "to free an invalid DMA memory address\n");
-                return;
-        }
-
         bucket = get_hash_bucket(ref, &flags);
         entry = bucket_find_exact(bucket, ref);
 
         if (!entry) {
+                if (dma_mapping_error(ref->dev, ref->dev_addr)) {
+                        err_printk(ref->dev, NULL,
+                                   "DMA-API: device driver tries "
+                                   "to free an invalid DMA memory address\n");
+                        return;
+                }
                 err_printk(ref->dev, NULL, "DMA-API: device driver tries "
                            "to free DMA memory it has not allocated "
                            "[device address=0x%016llx] [size=%llu bytes]\n",
@@ -910,6 +924,15 @@ static void check_unmap(struct dma_debug_entry *ref)
                            dir2name[ref->direction]);
         }
 
+        if (entry->map_err_type == MAP_ERR_NOT_CHECKED) {
+                err_printk(ref->dev, entry,
+                           "DMA-API: device driver failed to check map error"
+                           "[device address=0x%016llx] [size=%llu bytes] "
+                           "[mapped as %s]",
+                           ref->dev_addr, ref->size,
+                           type2name[entry->type]);
+        }
+
         hash_bucket_del(entry);
         dma_entry_free(entry);
 
@@ -1017,7 +1040,7 @@ void debug_dma_map_page(struct device *dev, struct page *page, size_t offset,
         if (unlikely(global_disable))
                 return;
 
-        if (unlikely(dma_mapping_error(dev, dma_addr)))
+        if (dma_mapping_error(dev, dma_addr))
                 return;
 
         entry = dma_entry_alloc();
@@ -1030,6 +1053,7 @@ void debug_dma_map_page(struct device *dev, struct page *page, size_t offset,
         entry->dev_addr  = dma_addr;
         entry->size      = size;
         entry->direction = direction;
+        entry->map_err_type = MAP_ERR_NOT_CHECKED;
 
         if (map_single)
                 entry->type = dma_debug_single;
@@ -1045,6 +1069,30 @@ void debug_dma_map_page(struct device *dev, struct page *page, size_t offset,
 }
 EXPORT_SYMBOL(debug_dma_map_page);
 
+void debug_dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
+{
+        struct dma_debug_entry ref;
+        struct dma_debug_entry *entry;
+        struct hash_bucket *bucket;
+        unsigned long flags;
+
+        if (unlikely(global_disable))
+                return;
+
+        ref.dev = dev;
+        ref.dev_addr = dma_addr;
+        bucket = get_hash_bucket(&ref, &flags);
+        entry = bucket_find_exact(bucket, &ref);
+
+        if (!entry)
+                goto out;
+
+        entry->map_err_type = MAP_ERR_CHECKED;
+out:
+        put_hash_bucket(bucket, &flags);
+}
+EXPORT_SYMBOL(debug_dma_mapping_error);
+
 void debug_dma_unmap_page(struct device *dev, dma_addr_t addr,
                           size_t size, int direction, bool map_single)
 {