linux-kernel - [PATCH] ssb: Fix coherent DMA mask for PCI devices

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Date:	Thu, 12 Jun 2008 15:33:13 +0200
From:	Michael Buesch <mb@...sch.de>
To:	John Linville <linville@...driver.com>
Cc:	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	"linux-kernel" <linux-kernel@...r.kernel.org>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Glauber Costa <gcosta@...hat.com>
Subject: [PATCH] ssb: Fix coherent DMA mask for PCI devices

This fixes setting the coherent DMA mask for PCI devices.

Signed-off-by: Michael Buesch <mb@...sch.de>

---

John, please queue this bugfix for 2.6.26

The whole SSB DMA API should be rewritten, as it makes too many bad
assumptions about the other subsytems. I will do that soon.
But let's apply this patch for now, as it fixes this particular bug.


Index: wireless-testing/drivers/ssb/main.c
===================================================================
--- wireless-testing.orig/drivers/ssb/main.c	2008-05-17 18:44:32.000000000 +0200
+++ wireless-testing/drivers/ssb/main.c	2008-06-12 15:24:04.000000000 +0200
@@ -1165,21 +1165,27 @@ u32 ssb_dma_translation(struct ssb_devic
 }
 EXPORT_SYMBOL(ssb_dma_translation);
 
 int ssb_dma_set_mask(struct ssb_device *ssb_dev, u64 mask)
 {
 	struct device *dma_dev = ssb_dev->dma_dev;
+	int err = 0;
 
 #ifdef CONFIG_SSB_PCIHOST
-	if (ssb_dev->bus->bustype == SSB_BUSTYPE_PCI)
-		return dma_set_mask(dma_dev, mask);
+	if (ssb_dev->bus->bustype == SSB_BUSTYPE_PCI) {
+		err = pci_set_dma_mask(ssb_dev->bus->host_pci, mask);
+		if (err)
+			return err;
+		err = pci_set_consistent_dma_mask(ssb_dev->bus->host_pci, mask);
+		return err;
+	}
 #endif
 	dma_dev->coherent_dma_mask = mask;
 	dma_dev->dma_mask = &dma_dev->coherent_dma_mask;
 
-	return 0;
+	return err;
 }
 EXPORT_SYMBOL(ssb_dma_set_mask);
 
 int ssb_bus_may_powerdown(struct ssb_bus *bus)
 {
 	struct ssb_chipcommon *cc;
--
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