ALSA: ctxfi: Fallback DMA mask to 32bit

commit 15c75b09f8d190f89ab4db463b87d411ca349dfe upstream.

Currently ctxfi driver tries to set only the 64bit DMA mask on 64bit
architectures, and bails out if it fails.  This causes a problem on
some platforms since the 64bit DMA isn't always guaranteed.  We should
fall back to the default 32bit DMA when 64bit DMA fails.

Fixes: 6d74b86d3c0f ("ALSA: ctxfi - Allow 64bit DMA")
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2 files changed, 12 insertions, 26 deletions

diff --git a/sound/pci/ctxfi/cthw20k1.c b/sound/pci/ctxfi/cthw20k1.c
index 9667cbfb0ca2..ab4cdab5cfa5 100644
--- a/sound/pci/ctxfi/cthw20k1.c
+++ b/sound/pci/ctxfi/cthw20k1.c
@@ -27,12 +27,6 @@
 #include "cthw20k1.h"
 #include "ct20k1reg.h"
 
-#if BITS_PER_LONG == 32
-#define CT_XFI_DMA_MASK         DMA_BIT_MASK(32) /* 32 bit PTE */
-#else
-#define CT_XFI_DMA_MASK         DMA_BIT_MASK(64) /* 64 bit PTE */
-#endif
-
 struct hw20k1 {
         struct hw hw;
         spinlock_t reg_20k1_lock;
@@ -1904,19 +1898,18 @@ static int hw_card_start(struct hw *hw)
 {
         int err;
         struct pci_dev *pci = hw->pci;
+        const unsigned int dma_bits = BITS_PER_LONG;
 
         err = pci_enable_device(pci);
         if (err < 0)
                 return err;
 
         /* Set DMA transfer mask */
-        if (dma_set_mask(&pci->dev, CT_XFI_DMA_MASK) < 0 ||
-            dma_set_coherent_mask(&pci->dev, CT_XFI_DMA_MASK) < 0) {
-                dev_err(hw->card->dev,
-                        "architecture does not support PCI busmaster DMA with mask 0x%llx\n",
-                        CT_XFI_DMA_MASK);
-                err = -ENXIO;
-                goto error1;
+        if (dma_set_mask(&pci->dev, DMA_BIT_MASK(dma_bits))) {
+                dma_set_coherent_mask(&pci->dev, DMA_BIT_MASK(dma_bits));
+        } else {
+                dma_set_mask(&pci->dev, DMA_BIT_MASK(32));
+                dma_set_coherent_mask(&pci->dev, DMA_BIT_MASK(32));
         }
 
         if (!hw->io_base) {
diff --git a/sound/pci/ctxfi/cthw20k2.c b/sound/pci/ctxfi/cthw20k2.c
index 6414ecf93efa..18ee7768b7c4 100644
--- a/sound/pci/ctxfi/cthw20k2.c
+++ b/sound/pci/ctxfi/cthw20k2.c
@@ -26,12 +26,6 @@
 #include "cthw20k2.h"
 #include "ct20k2reg.h"
 
-#if BITS_PER_LONG == 32
-#define CT_XFI_DMA_MASK         DMA_BIT_MASK(32) /* 32 bit PTE */
-#else
-#define CT_XFI_DMA_MASK         DMA_BIT_MASK(64) /* 64 bit PTE */
-#endif
-
 struct hw20k2 {
         struct hw hw;
         /* for i2c */
@@ -2029,19 +2023,18 @@ static int hw_card_start(struct hw *hw)
         int err = 0;
         struct pci_dev *pci = hw->pci;
         unsigned int gctl;
+        const unsigned int dma_bits = BITS_PER_LONG;
 
         err = pci_enable_device(pci);
         if (err < 0)
                 return err;
 
         /* Set DMA transfer mask */
-        if (dma_set_mask(&pci->dev, CT_XFI_DMA_MASK) < 0 ||
-            dma_set_coherent_mask(&pci->dev, CT_XFI_DMA_MASK) < 0) {
-                dev_err(hw->card->dev,
-                        "architecture does not support PCI busmaster DMA with mask 0x%llx\n",
-                        CT_XFI_DMA_MASK);
-                err = -ENXIO;
-                goto error1;
+        if (!dma_set_mask(&pci->dev, DMA_BIT_MASK(dma_bits))) {
+                dma_set_coherent_mask(&pci->dev, DMA_BIT_MASK(dma_bits));
+        } else {
+                dma_set_mask(&pci->dev, DMA_BIT_MASK(32));
+                dma_set_coherent_mask(&pci->dev, DMA_BIT_MASK(32));
         }
 
         if (!hw->io_base) {