diff options
Diffstat (limited to 'lib/dma-debug.c')
| -rw-r--r-- | lib/dma-debug.c | 43 |
1 files changed, 28 insertions, 15 deletions
diff --git a/lib/dma-debug.c b/lib/dma-debug.c index add80cc02dbe..9722bd2dbc9b 100644 --- a/lib/dma-debug.c +++ b/lib/dma-debug.c @@ -102,6 +102,14 @@ static DEFINE_SPINLOCK(free_entries_lock); /* Global disable flag - will be set in case of an error */ static u32 global_disable __read_mostly; +/* Early initialization disable flag, set at the end of dma_debug_init */ +static bool dma_debug_initialized __read_mostly; + +static inline bool dma_debug_disabled(void) +{ + return global_disable || !dma_debug_initialized; +} + /* Global error count */ static u32 error_count; @@ -945,7 +953,7 @@ static int dma_debug_device_change(struct notifier_block *nb, unsigned long acti struct dma_debug_entry *uninitialized_var(entry); int count; - if (global_disable) + if (dma_debug_disabled()) return 0; switch (action) { @@ -973,7 +981,7 @@ void dma_debug_add_bus(struct bus_type *bus) { struct notifier_block *nb; - if (global_disable) + if (dma_debug_disabled()) return; nb = kzalloc(sizeof(struct notifier_block), GFP_KERNEL); @@ -994,6 +1002,9 @@ void dma_debug_init(u32 num_entries) { int i; + /* Do not use dma_debug_initialized here, since we really want to be + * called to set dma_debug_initialized + */ if (global_disable) return; @@ -1021,6 +1032,8 @@ void dma_debug_init(u32 num_entries) nr_total_entries = num_free_entries; + dma_debug_initialized = true; + pr_info("DMA-API: debugging enabled by kernel config\n"); } @@ -1243,7 +1256,7 @@ void debug_dma_map_page(struct device *dev, struct page *page, size_t offset, { struct dma_debug_entry *entry; - if (unlikely(global_disable)) + if (unlikely(dma_debug_disabled())) return; if (dma_mapping_error(dev, dma_addr)) @@ -1283,7 +1296,7 @@ void debug_dma_mapping_error(struct device *dev, dma_addr_t dma_addr) struct hash_bucket *bucket; unsigned long flags; - if (unlikely(global_disable)) + if (unlikely(dma_debug_disabled())) return; ref.dev = dev; @@ -1325,7 +1338,7 @@ void debug_dma_unmap_page(struct device *dev, dma_addr_t addr, .direction = direction, }; - if (unlikely(global_disable)) + if (unlikely(dma_debug_disabled())) return; if (map_single) @@ -1342,7 +1355,7 @@ void debug_dma_map_sg(struct device *dev, struct scatterlist *sg, struct scatterlist *s; int i; - if (unlikely(global_disable)) + if (unlikely(dma_debug_disabled())) return; for_each_sg(sg, s, mapped_ents, i) { @@ -1395,7 +1408,7 @@ void debug_dma_unmap_sg(struct device *dev, struct scatterlist *sglist, struct scatterlist *s; int mapped_ents = 0, i; - if (unlikely(global_disable)) + if (unlikely(dma_debug_disabled())) return; for_each_sg(sglist, s, nelems, i) { @@ -1427,7 +1440,7 @@ void debug_dma_alloc_coherent(struct device *dev, size_t size, { struct dma_debug_entry *entry; - if (unlikely(global_disable)) + if (unlikely(dma_debug_disabled())) return; if (unlikely(virt == NULL)) @@ -1462,7 +1475,7 @@ void debug_dma_free_coherent(struct device *dev, size_t size, .direction = DMA_BIDIRECTIONAL, }; - if (unlikely(global_disable)) + if (unlikely(dma_debug_disabled())) return; check_unmap(&ref); @@ -1474,7 +1487,7 @@ void debug_dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, { struct dma_debug_entry ref; - if (unlikely(global_disable)) + if (unlikely(dma_debug_disabled())) return; ref.type = dma_debug_single; @@ -1494,7 +1507,7 @@ void debug_dma_sync_single_for_device(struct device *dev, { struct dma_debug_entry ref; - if (unlikely(global_disable)) + if (unlikely(dma_debug_disabled())) return; ref.type = dma_debug_single; @@ -1515,7 +1528,7 @@ void debug_dma_sync_single_range_for_cpu(struct device *dev, { struct dma_debug_entry ref; - if (unlikely(global_disable)) + if (unlikely(dma_debug_disabled())) return; ref.type = dma_debug_single; @@ -1536,7 +1549,7 @@ void debug_dma_sync_single_range_for_device(struct device *dev, { struct dma_debug_entry ref; - if (unlikely(global_disable)) + if (unlikely(dma_debug_disabled())) return; ref.type = dma_debug_single; @@ -1556,7 +1569,7 @@ void debug_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, struct scatterlist *s; int mapped_ents = 0, i; - if (unlikely(global_disable)) + if (unlikely(dma_debug_disabled())) return; for_each_sg(sg, s, nelems, i) { @@ -1589,7 +1602,7 @@ void debug_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, struct scatterlist *s; int mapped_ents = 0, i; - if (unlikely(global_disable)) + if (unlikely(dma_debug_disabled())) return; for_each_sg(sg, s, nelems, i) { |