net: ipa: DMA addresses are nicely aligned

A recent patch avoided doing 64-bit modulo operations by checking
the alignment of some DMA allocations using only the lower 32 bits
of the address.

David Laight pointed out (after the fix was committed) that DMA
allocations might already satisfy the alignment requirements.  And
he was right.

Remove the alignment checks that occur after DMA allocation requests,
and update comments to explain why the constraint is satisfied.  The
only place IPA_TABLE_ALIGN was used was to check the alignment; it is
therefore no longer needed, so get rid of it.

Add comments where GSI_RING_ELEMENT_SIZE and the tre_count and
event_count channel data fields are defined to make explicit they
are required to be powers of 2.

Revise a comment in gsi_trans_pool_init_dma(), taking into account
that dma_alloc_coherent() guarantees its result is aligned to a page
size (or order thereof).

Don't bother printing an error if a DMA allocation fails.

Suggested-by: David Laight <David.Laight@ACULAB.COM>
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 9 deletions

diff --git a/drivers/net/ipa/gsi.c b/drivers/net/ipa/gsi.c
index 585574af36ec..1c835b3e1a43 100644
--- a/drivers/net/ipa/gsi.c
+++ b/drivers/net/ipa/gsi.c
@@ -1444,18 +1444,13 @@ static int gsi_ring_alloc(struct gsi *gsi, struct gsi_ring *ring, u32 count)
 	dma_addr_t addr;
 
 	/* Hardware requires a 2^n ring size, with alignment equal to size.
-	 * The size is a power of 2, so we can check alignment using just
-	 * the bottom 32 bits for a DMA address of any size.
+	 * The DMA address returned by dma_alloc_coherent() is guaranteed to
+	 * be a power-of-2 number of pages, which satisfies the requirement.
 	 */
 	ring->virt = dma_alloc_coherent(dev, size, &addr, GFP_KERNEL);
-	if (ring->virt && lower_32_bits(addr) % size) {
-		dma_free_coherent(dev, size, ring->virt, addr);
-		dev_err(dev, "unable to alloc 0x%x-aligned ring buffer\n",
-			size);
-		return -EINVAL;	/* Not a good error value, but distinct */
-	} else if (!ring->virt) {
+	if (!ring->virt)
 		return -ENOMEM;
-	}
+
 	ring->addr = addr;
 	ring->count = count;