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-rw-r--r--lib/dma-debug.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/lib/dma-debug.c b/lib/dma-debug.c
index c38083871f1..2defd1308b0 100644
--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -463,7 +463,7 @@ static int active_pfn_set_overlap(unsigned long pfn, int overlap)
int i;
if (overlap > ACTIVE_PFN_MAX_OVERLAP || overlap < 0)
- return 0;
+ return overlap;
for (i = RADIX_TREE_MAX_TAGS - 1; i >= 0; i--)
if (overlap & 1 << i)
@@ -486,7 +486,7 @@ static void active_pfn_inc_overlap(unsigned long pfn)
* debug_dma_assert_idle() as the pfn may be marked idle
* prematurely.
*/
- WARN_ONCE(overlap == 0,
+ WARN_ONCE(overlap > ACTIVE_PFN_MAX_OVERLAP,
"DMA-API: exceeded %d overlapping mappings of pfn %lx\n",
ACTIVE_PFN_MAX_OVERLAP, pfn);
}
@@ -517,7 +517,11 @@ static void active_pfn_remove(struct dma_debug_entry *entry)
unsigned long flags;
spin_lock_irqsave(&radix_lock, flags);
- if (active_pfn_dec_overlap(entry->pfn) == 0)
+ /* since we are counting overlaps the final put of the
+ * entry->pfn will occur when the overlap count is 0.
+ * active_pfn_dec_overlap() returns -1 in that case
+ */
+ if (active_pfn_dec_overlap(entry->pfn) < 0)
radix_tree_delete(&dma_active_pfn, entry->pfn);
spin_unlock_irqrestore(&radix_lock, flags);
}