[3.19.y-ckt stable] Patch "dmaengine: pl330: Fix overflow when reporting residue in memcpy" has been added to staging queue

[Kamal Mostafa]

This is a note to let you know that I have just added a patch titled

    dmaengine: pl330: Fix overflow when reporting residue in memcpy

to the linux-3.19.y-queue branch of the 3.19.y-ckt extended stable tree 
which can be found at:

    http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-3.19.y-queue

This patch is scheduled to be released in version 3.19.8-ckt6.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.19.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

------

>From 050dc8c9c10330d969879fda7bea02a71c87d1e5 Mon Sep 17 00:00:00 2001
From: Krzysztof Kozlowski <k.kozlowski at samsung.com>
Date: Mon, 15 Jun 2015 17:25:16 +0900
Subject: dmaengine: pl330: Fix overflow when reporting residue in memcpy

commit ae128293d97404f491dc76f1843c7adacfec3441 upstream.

During memcpy operations the residue was always set to an u32 overflowed
value.

In pl330_tx_status() function number of currently transferred bytes was
subtracted from internal "bytes_requested" field. However this
"bytes_requested" was not initialized at start to length of memcpy
buffer so transferred bytes were subtracted from 0 causing overflow.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski at samsung.com>
Fixes: aee4d1fac887 ("dmaengine: pl330: improve pl330_tx_status() function")
Signed-off-by: Vinod Koul <vinod.koul at intel.com>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 drivers/dma/pl330.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c
index bdf40b5..c068ef1 100644
--- a/drivers/dma/pl330.c
+++ b/drivers/dma/pl330.c
@@ -2521,6 +2521,7 @@ pl330_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dst,
 		desc->rqcfg.brst_len = 1;

 	desc->rqcfg.brst_len = get_burst_len(desc, len);
+	desc->bytes_requested = len;

 	desc->txd.flags = flags;

--
1.9.1