[PATCH 158/270] ASoC: fsi: don't reschedule DMA from an atomic context
Herton Ronaldo Krzesinski
herton.krzesinski at canonical.com
Mon Nov 26 16:57:28 UTC 2012
3.5.7u1 -stable review patch. If anyone has any objections, please let me know.
------------------
From: Guennadi Liakhovetski <g.liakhovetski at gmx.de>
commit 57451e437796548d658d03c2c4aab659eafcd799 upstream.
shdma doesn't support transfer re-scheduling or triggering from callbacks
or from atomic context. The fsi driver issues DMA transfers from a tasklet
context, which is a bug. To fix it convert tasklet to a work.
Reported-by: Do Q.Thang <dq-thang at jinso.co.jp>
Tested-by: Do Q.Thang <dq-thang at jinso.co.jp>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski at gmx.de>
Signed-off-by: Mark Brown <broonie at opensource.wolfsonmicro.com>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski at canonical.com>
---
sound/soc/sh/fsi.c | 15 ++++++++-------
1 file changed, 8 insertions(+), 7 deletions(-)
diff --git a/sound/soc/sh/fsi.c b/sound/soc/sh/fsi.c
index 2ef9853..e96c395 100644
--- a/sound/soc/sh/fsi.c
+++ b/sound/soc/sh/fsi.c
@@ -20,6 +20,7 @@
#include <linux/sh_dma.h>
#include <linux/slab.h>
#include <linux/module.h>
+#include <linux/workqueue.h>
#include <sound/soc.h>
#include <sound/sh_fsi.h>
@@ -223,7 +224,7 @@ struct fsi_stream {
*/
struct dma_chan *chan;
struct sh_dmae_slave slave; /* see fsi_handler_init() */
- struct tasklet_struct tasklet;
+ struct work_struct work;
dma_addr_t dma;
};
@@ -1085,9 +1086,9 @@ static void fsi_dma_complete(void *data)
snd_pcm_period_elapsed(io->substream);
}
-static void fsi_dma_do_tasklet(unsigned long data)
+static void fsi_dma_do_work(struct work_struct *work)
{
- struct fsi_stream *io = (struct fsi_stream *)data;
+ struct fsi_stream *io = container_of(work, struct fsi_stream, work);
struct fsi_priv *fsi = fsi_stream_to_priv(io);
struct dma_chan *chan;
struct snd_soc_dai *dai;
@@ -1140,7 +1141,7 @@ static void fsi_dma_do_tasklet(unsigned long data)
* FIXME
*
* In DMAEngine case, codec and FSI cannot be started simultaneously
- * since FSI is using tasklet.
+ * since FSI is using the scheduler work queue.
* Therefore, in capture case, probably FSI FIFO will have got
* overflow error in this point.
* in that case, DMA cannot start transfer until error was cleared.
@@ -1164,7 +1165,7 @@ static bool fsi_dma_filter(struct dma_chan *chan, void *param)
static int fsi_dma_transfer(struct fsi_priv *fsi, struct fsi_stream *io)
{
- tasklet_schedule(&io->tasklet);
+ schedule_work(&io->work);
return 0;
}
@@ -1195,14 +1196,14 @@ static int fsi_dma_probe(struct fsi_priv *fsi, struct fsi_stream *io)
if (!io->chan)
return -EIO;
- tasklet_init(&io->tasklet, fsi_dma_do_tasklet, (unsigned long)io);
+ INIT_WORK(&io->work, fsi_dma_do_work);
return 0;
}
static int fsi_dma_remove(struct fsi_priv *fsi, struct fsi_stream *io)
{
- tasklet_kill(&io->tasklet);
+ cancel_work_sync(&io->work);
fsi_stream_stop(fsi, io);
--
1.7.9.5
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