pdc_desc_get() is called from pd_prep_slave_sg, and the function is
called from interrupt context(e.g. Uart driver "pch_uart.c").
In fact, I saw kernel error message.
So, GFP_ATOMIC must be used not GFP_NOIO.
commitID:5c1ef59168c485318e40ba485c1eba57d81d0faa
Kernel: 3.0 3.2 3.4 3.9
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Tomoya MORINAGA <tomoya.rohm@xxxxxxxxx>
Signed-off-by: Vinod Koul <vinod.koul@xxxxxxxxx>
---
drivers/dma/pch_dma.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/dma/pch_dma.c b/drivers/dma/pch_dma.c
index d01faeb..ce3dc3e 100644
--- a/drivers/dma/pch_dma.c
+++ b/drivers/dma/pch_dma.c
@@ -476,7 +476,7 @@ static struct pch_dma_desc *pdc_desc_get(struct pch_dma_chan *pd_chan)
dev_dbg(chan2dev(&pd_chan->chan), "scanned %d descriptors\n", i);
if (!ret) {
- ret = pdc_alloc_desc(&pd_chan->chan, GFP_NOIO);
+ ret = pdc_alloc_desc(&pd_chan->chan, GFP_ATOMIC);
if (ret) {
spin_lock(&pd_chan->lock);
pd_chan->descs_allocated++;
--
1.7.9.5
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