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authorRene Herman <rene.herman@keyaccess.nl>2008-07-25 19:44:42 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-26 12:00:02 -0700
commite86b19ce64a25d39bb0e10e0e695213fc5993dfb (patch)
treea71e66f3a9fc6d1860ff19fac374838f2008cc9a
parentc491b2ffae3fad5e6e3cb2320b46bb8ea8729d49 (diff)
downloadop-kernel-dev-e86b19ce64a25d39bb0e10e0e695213fc5993dfb.zip
op-kernel-dev-e86b19ce64a25d39bb0e10e0e695213fc5993dfb.tar.gz
pnp: set the pnp_card dma_mask for use by ISAPnP cards
dma_alloc_coherent() on x86 currently takes a passed in NULL device pointer to mean that it should allocate an ISA compatible (24-bit) buffer which is a bit of a hack. The ALSA ISA drivers are the main consumers of this but have a struct device in fact readily available. For the PnP drivers, the specific pnp_dev->dev device pointer is not always available at the right time so for now we want to pass the pnp_card->dev instead which is always available. Set its dma_mask in preparation for doing so. This does not fix a current bug -- 2.6.26-rc1 stumbled over the NULL hack in dma_alloc_coherent() but this has already been fixed in commit 4a367f3a9dbf2e7ffcee4702203479809236ee6e by Takashi Iwai. Signed-off-by: Rene Herman <rene.herman@gmail.com> Acked-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Acked-by: Takashi Iwai <tiwai@suse.de> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--drivers/pnp/card.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/pnp/card.c b/drivers/pnp/card.c
index a762a41..b00ef10 100644
--- a/drivers/pnp/card.c
+++ b/drivers/pnp/card.c
@@ -8,6 +8,7 @@
#include <linux/ctype.h>
#include <linux/slab.h>
#include <linux/pnp.h>
+#include <linux/dma-mapping.h>
#include "base.h"
LIST_HEAD(pnp_cards);
@@ -167,6 +168,9 @@ struct pnp_card *pnp_alloc_card(struct pnp_protocol *protocol, int id, char *pnp
sprintf(card->dev.bus_id, "%02x:%02x", card->protocol->number,
card->number);
+ card->dev.coherent_dma_mask = DMA_24BIT_MASK;
+ card->dev.dma_mask = &card->dev.coherent_dma_mask;
+
dev_id = pnp_add_card_id(card, pnpid);
if (!dev_id) {
kfree(card);
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