This is a note to let you know that I've just added the patch titled
dmaengine: at_xdmac: fix bug in prep_dma_cyclic
to the 4.2-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:
dmaengine-at_xdmac-fix-bug-in-prep_dma_cyclic.patch
and it can be found in the queue-4.2 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From e900c30dc1bb0cbc07708e9be1188f531632b2ef Mon Sep 17 00:00:00 2001
From: Ludovic Desroches <ludovic.desroches@xxxxxxxxx>
Date: Wed, 22 Jul 2015 16:12:29 +0200
Subject: dmaengine: at_xdmac: fix bug in prep_dma_cyclic
From: Ludovic Desroches <ludovic.desroches@xxxxxxxxx>
commit e900c30dc1bb0cbc07708e9be1188f531632b2ef upstream.
In cyclic mode, the round chaining has been broken by the introduction
of at_xdmac_queue_desc(): AT_XDMAC_MBR_UBC_NDE is set for all descriptors
excepted for the last one. at_xdmac_queue_desc() has to be called one
more time to chain the last and the first descriptors.
Signed-off-by: Ludovic Desroches <ludovic.desroches@xxxxxxxxx>
Fixes: 0d0ee751f7f7 ("dmaengine: xdmac: Rework the chaining logic")
Signed-off-by: Vinod Koul <vinod.koul@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/dma/at_xdmac.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
--- a/drivers/dma/at_xdmac.c
+++ b/drivers/dma/at_xdmac.c
@@ -806,10 +806,7 @@ at_xdmac_prep_dma_cyclic(struct dma_chan
list_add_tail(&desc->desc_node, &first->descs_list);
}
- prev->lld.mbr_nda = first->tx_dma_desc.phys;
- dev_dbg(chan2dev(chan),
- "%s: chain lld: prev=0x%p, mbr_nda=%pad\n",
- __func__, prev, &prev->lld.mbr_nda);
+ at_xdmac_queue_desc(chan, prev, first);
first->tx_dma_desc.flags = flags;
first->xfer_size = buf_len;
first->direction = direction;
Patches currently in stable-queue which might be from ludovic.desroches@xxxxxxxxx are
queue-4.2/dmaengine-at_xdmac-clean-used-descriptor.patch
queue-4.2/dmaengine-at_xdmac-change-block-increment-addressing-mode.patch
queue-4.2/dmaengine-at_xdmac-fix-bug-in-prep_dma_cyclic.patch
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