pch_dma: Use GFP_ATOMIC because called from interrupt context

commit 5c1ef59168c485318e40ba485c1eba57d81d0faa upstream.

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.

Signed-off-by: Tomoya MORINAGA <tomoya.rohm@gmail.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/dma/pch_dma.c b/drivers/dma/pch_dma.c
index 65c0495a6d40b74a1f0d7dc659f4ff72ec7c4c63..d05669bf7a23167717d5093084d902f5e45f11ec 100644 (file)
--- 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++;