This is a note to let you know that I've just added the patch titled
dmaengine: imx-dma: fix callback path in tasklet
to the 3.4-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-imx-dma-fix-callback-path-in-tasklet.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From fcaaba6c7136fe47e5a13352f99a64b019b6d2c5 Mon Sep 17 00:00:00 2001
From: Michael Grzeschik <m.grzeschik@xxxxxxxxxxxxxx>
Date: Tue, 17 Sep 2013 15:56:08 +0200
Subject: dmaengine: imx-dma: fix callback path in tasklet
From: Michael Grzeschik <m.grzeschik@xxxxxxxxxxxxxx>
commit fcaaba6c7136fe47e5a13352f99a64b019b6d2c5 upstream.
We need to free the ld_active list head before jumping into the callback
routine. Otherwise the callback could run into issue_pending and change
our ld_active list head we just going to free. This will run the channel
list into an currupted and undefined state.
Signed-off-by: Michael Grzeschik <m.grzeschik@xxxxxxxxxxxxxx>
Signed-off-by: Vinod Koul <vinod.koul@xxxxxxxxx>
Cc: Jonghwan Choi <jhbird.choi@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/dma/imx-dma.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
--- a/drivers/dma/imx-dma.c
+++ b/drivers/dma/imx-dma.c
@@ -563,13 +563,11 @@ static void imxdma_tasklet(unsigned long
if (list_empty(&imxdmac->ld_active)) {
/* Someone might have called terminate all */
- goto out;
+ spin_unlock_irqrestore(&imxdma->lock, flags);
+ return;
}
desc = list_first_entry(&imxdmac->ld_active, struct imxdma_desc, node);
- if (desc->desc.callback)
- desc->desc.callback(desc->desc.callback_param);
-
/* If we are dealing with a cyclic descriptor keep it on ld_active
* and dont mark the descripor as complete.
* Only in non-cyclic cases it would be marked as complete
@@ -597,6 +595,10 @@ static void imxdma_tasklet(unsigned long
}
out:
spin_unlock_irqrestore(&imxdma->lock, flags);
+
+ if (desc->desc.callback)
+ desc->desc.callback(desc->desc.callback_param);
+
}
static int imxdma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
Patches currently in stable-queue which might be from m.grzeschik@xxxxxxxxxxxxxx are
queue-3.4/dmaengine-imx-dma-fix-slow-path-issue-in-prep_dma_cyclic.patch
queue-3.4/dmaengine-imx-dma-fix-callback-path-in-tasklet.patch
queue-3.4/dmaengine-imx-dma-fix-lockdep-issue-between-irqhandler-and-tasklet.patch
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