powerpc/vio: Fix a dma_mask issue of vio

I encountered following issue:
[    0.283035] ibmvscsi 30000015: couldn't initialize event pool
[    5.688822] ibmvscsi: probe of 30000015 failed with error -1

which prevents the storage from being recognized, and the machine from
booting.

After some digging, it seems that it is caused by commit 4886c399da

as dma_mask pointer in viodev->dev is not set, so in
dma_set_mask_and_coherent(), dma_set_coherent_mask() is not called
because dma_set_mask(), which is dma_set_mask_pSeriesLP() returned EIO.
While before the commit, dma_set_coherent_mask() is always called.

I tried to replace dma_set_mask_and_coherent() with
dma_coerce_mask_and_coherent(), and the machine could boot again.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/kernel/vio.c b/arch/powerpc/kernel/vio.c
index e7d0c88f621aa08425cb502b9e68b4cbf549ccd3..76a64821f4a23653b64cc6ba0e32daec509ee5b5 100644 (file)
--- a/arch/powerpc/kernel/vio.c
+++ b/arch/powerpc/kernel/vio.c
@@ -1419,7 +1419,7 @@ struct vio_dev *vio_register_device_node(struct device_node *of_node)
 
                /* needed to ensure proper operation of coherent allocations
                 * later, in case driver doesn't set it explicitly */
-               dma_set_mask_and_coherent(&viodev->dev, DMA_BIT_MASK(64));
+               dma_coerce_mask_and_coherent(&viodev->dev, DMA_BIT_MASK(64));
        }
 
        /* register with generic device framework */