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-rw-r--r--drivers/pnp/manager.c14
1 files changed, 9 insertions, 5 deletions
diff --git a/drivers/pnp/manager.c b/drivers/pnp/manager.c
index 95cebf0185de..9357aa779048 100644
--- a/drivers/pnp/manager.c
+++ b/drivers/pnp/manager.c
@@ -211,6 +211,12 @@ static int pnp_assign_dma(struct pnp_dev *dev, struct pnp_dma *rule, int idx)
res->start = -1;
res->end = -1;
+ if (!rule->map) {
+ res->flags |= IORESOURCE_DISABLED;
+ pnp_dbg(&dev->dev, " dma %d disabled\n", idx);
+ goto __add;
+ }
+
for (i = 0; i < 8; i++) {
if (rule->map & (1 << xtab[i])) {
res->start = res->end = xtab[i];
@@ -218,11 +224,9 @@ static int pnp_assign_dma(struct pnp_dev *dev, struct pnp_dma *rule, int idx)
goto __add;
}
}
-#ifdef MAX_DMA_CHANNELS
- res->start = res->end = MAX_DMA_CHANNELS;
-#endif
- res->flags |= IORESOURCE_DISABLED;
- pnp_dbg(&dev->dev, " disable dma %d\n", idx);
+
+ pnp_dbg(&dev->dev, " couldn't assign dma %d\n", idx);
+ return -EBUSY;
__add:
pnp_add_dma_resource(dev, res->start, res->flags);