The patch titled dma-debug: allow DMA_BIDIRECTIONAL mappings to be synced with DMA_FROM_DEVICE and has been removed from the -mm tree. Its filename was dma-debug-allow-dma_bidirectional-mappings-to-be-synced-with-dma_from_device-and.patch This patch was dropped because it was merged into mainline or a subsystem tree The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ Subject: dma-debug: allow DMA_BIDIRECTIONAL mappings to be synced with DMA_FROM_DEVICE and From: Krzysztof Halasa <khc@xxxxxxxxx> There is no need to perform full BIDIR sync (copying the buffers in case of swiotlb and similar schemes) if we know that the owner (CPU or device) hasn't altered the data. Addresses the false-positive reported at http://bugzilla.kernel.org/show_bug.cgi?id=14169 Signed-off-by: Krzysztof Halasa <khc@xxxxxxxxx> Cc: David Miller <davem@xxxxxxxxxxxxx> Cc: Joerg Roedel <joerg.roedel@xxxxxxx> Cc: <stable@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- lib/dma-debug.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff -puN lib/dma-debug.c~dma-debug-allow-dma_bidirectional-mappings-to-be-synced-with-dma_from_device-and lib/dma-debug.c --- a/lib/dma-debug.c~dma-debug-allow-dma_bidirectional-mappings-to-be-synced-with-dma_from_device-and +++ a/lib/dma-debug.c @@ -913,6 +913,9 @@ static void check_sync(struct device *de ref->size); } + if (entry->direction == DMA_BIDIRECTIONAL) + goto out; + if (ref->direction != entry->direction) { err_printk(dev, entry, "DMA-API: device driver syncs " "DMA memory with different direction " @@ -923,9 +926,6 @@ static void check_sync(struct device *de dir2name[ref->direction]); } - if (entry->direction == DMA_BIDIRECTIONAL) - goto out; - if (to_cpu && !(entry->direction == DMA_FROM_DEVICE) && !(ref->direction == DMA_TO_DEVICE)) err_printk(dev, entry, "DMA-API: device driver syncs " @@ -948,7 +948,6 @@ static void check_sync(struct device *de out: put_hash_bucket(bucket, &flags); - } void debug_dma_map_page(struct device *dev, struct page *page, size_t offset, _ Patches currently in -mm which might be from khc@xxxxxxxxx are origin.patch linux-next.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html