mei: me: Use dma_set_mask_and_coherent() and simplify code

Use dma_set_mask_and_coherent() instead of unrolling it with some
dma_set_mask()+dma_set_coherent_mask().

Moreover, as stated in [1], dma_set_mask() with a 64-bit mask will never
fail if dev->dma_mask is non-NULL.
So, if it fails, the 32 bits case will also fail for the same reason.

Simplify code and remove some dead code accordingly.

While at it, include directly <linux/dma-mapping.h> instead on relying on
indirect inclusion.

[1]: https://lkml.org/lkml/2021/6/7/398

Acked-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/67ddcec656194153830684e6ff4513114e8859d6.1641624544.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/misc/mei/pci-me.c b/drivers/misc/mei/pci-me.c
index 3a45aaf..a05cdb2 100644 (file)
--- a/drivers/misc/mei/pci-me.c
+++ b/drivers/misc/mei/pci-me.c
@@ -10,6 +10,7 @@
 #include <linux/errno.h>
 #include <linux/types.h>
 #include <linux/pci.h>
+#include <linux/dma-mapping.h>
 #include <linux/sched.h>
 #include <linux/interrupt.h>
 
@@ -192,14 +193,7 @@ static int mei_me_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
                goto end;
        }
 
-       if (dma_set_mask(&pdev->dev, DMA_BIT_MASK(64)) ||
-           dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64))) {
-
-               err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
-               if (err)
-                       err = dma_set_coherent_mask(&pdev->dev,
-                                                   DMA_BIT_MASK(32));
-       }
+       err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
        if (err) {
                dev_err(&pdev->dev, "No usable DMA configuration, aborting\n");
                goto end;