[patch 2.6.21-rc2] init dma masks in pnp_dev

[patch 2.6.21-rc2] init dma masks in pnp_dev

[David Brownell]

PNP now initializes device dma masks, which prevents oopses when generic
dma calls are made using pnp device nodes.

This assumes PNP only uses ISA DMA, with 24 bit addresses; and that it's
safe to init those masks for all devices (rather than finding out which
devices have been assigned DMA channels, and handling only those).

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>

Index: g26/include/linux/pnp.h
===================================================================
--- g26.orig/include/linux/pnp.h	2007-02-12 00:31:26.000000000 -0800
+++ g26/include/linux/pnp.h	2007-02-18 20:18:55.000000000 -0800
@@ -177,6 +177,7 @@ static inline void pnp_set_card_drvdata 
 
 struct pnp_dev {
 	struct device dev;		/* Driver Model device interface */
+	u64 dma_mask;
 	unsigned char number;		/* used as an index, must be unique */
 	int status;
 
Index: g26/drivers/pnp/core.c
===================================================================
--- g26.orig/drivers/pnp/core.c	2005-11-12 22:24:18.000000000 -0800
+++ g26/drivers/pnp/core.c	2007-02-18 20:42:17.000000000 -0800
@@ -14,6 +14,7 @@
 #include <linux/string.h>
 #include <linux/slab.h>
 #include <linux/errno.h>
+#include <linux/dma-mapping.h>
 
 #include "base.h"
 
@@ -114,6 +115,8 @@ int __pnp_add_device(struct pnp_dev *dev
 	int ret;
 	pnp_fixup_device(dev);
 	dev->dev.bus = &pnp_bus_type;
+	dev->dev.dma_mask = &dev->dma_mask;
+	dev->dma_mask = dev->dev.coherent_dma_mask = DMA_24BIT_MASK;
 	dev->dev.release = &pnp_release_device;
 	dev->status = PNP_READY;
 	spin_lock(&pnp_lock);