Patch "coresight: tmc: Configure DMA mask appropriately" has been added to the 4.9-stable tree

This is a note to let you know that I've just added the patch titled

coresight: tmc: Configure DMA mask appropriately

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
coresight-tmc-configure-dma-mask-appropriately.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Robin Murphy <[email protected]>
Date: Mon, 5 Jun 2017 14:15:09 -0600
Subject: coresight: tmc: Configure DMA mask appropriately

From: Robin Murphy <[email protected]>

[ Upstream commit a3959c50b02f57df4c4e4f14f632220f1c0b1f79 ]

Before making any DMA API calls, the ETR driver should really be setting its masks to ensure that DMA is possible. Especially since it can address more than the 32-bit default mask set by the AMBA bus code.

---
 drivers/hwtracing/coresight/coresight-tmc.c |    7 +++++++
 1 file changed, 7 insertions(+)

@@ -362,6 +362,13 @@ static int tmc_probe(struct amba_device
 		desc.type = CORESIGHT_DEV_TYPE_SINK;
 		desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_BUFFER;
 		desc.ops = &tmc_etr_cs_ops;
+		/*
+		 * ETR configuration uses a 40-bit AXI master in place of
+		 * the embedded SRAM of ETB/ETF.
+		 */
+		ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(40));
+		if (ret)
+			goto out;
 	} else {
 		desc.type = CORESIGHT_DEV_TYPE_LINKSINK;
 		desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_FIFO;

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/coresight-tmc-configure-dma-mask-appropriately.patch queue-4.9/arm64-futex-fix-undefined-behaviour-with-futex_op_oparg_shift-usage.patch