PNP: add pnp_resource index for ISAPNP

Save the ISAPNP config register index in the struct pnp_resource.

We need this because it is important to write ISAPNP configuration
back to the same registers we read it from.  For example, if we
read valid regions from memory descriptors 0, 1, and 3, we'd
better write them back to the same registers, without compressing
them to descriptors 0, 1, and 2.

This was previously guaranteed by using the index into the
pnp_resource_table array as the ISAPNP config register index.
However, I am removing those fixed-size arrays, so we need to
save the ISAPNP register index elsewhere.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 46 insertions, 17 deletions

diff --git a/drivers/pnp/isapnp/core.c b/drivers/pnp/isapnp/core.c
index a62ecc6f13b..f949a538ccd 100644
--- a/drivers/pnp/isapnp/core.c
+++ b/drivers/pnp/isapnp/core.c
@@ -931,6 +931,7 @@ EXPORT_SYMBOL(isapnp_write_byte);
 
 static int isapnp_read_resources(struct pnp_dev *dev)
 {
+	struct pnp_resource *pnp_res;
 	struct resource *res;
 	int tmp, ret;
 
@@ -940,7 +941,9 @@ static int isapnp_read_resources(struct pnp_dev *dev)
 			ret = isapnp_read_word(ISAPNP_CFG_PORT + (tmp << 1));
 			if (!ret)
 				continue;
-			res = pnp_get_resource(dev, IORESOURCE_IO, tmp);
+			pnp_res = pnp_get_pnp_resource(dev, IORESOURCE_IO, tmp);
+			pnp_res->index = tmp;
+			res = &pnp_res->res;
 			res->start = ret;
 			res->flags = IORESOURCE_IO;
 		}
@@ -949,7 +952,10 @@ static int isapnp_read_resources(struct pnp_dev *dev)
 			    isapnp_read_word(ISAPNP_CFG_MEM + (tmp << 3)) << 8;
 			if (!ret)
 				continue;
-			res = pnp_get_resource(dev, IORESOURCE_MEM, tmp);
+			pnp_res = pnp_get_pnp_resource(dev, IORESOURCE_MEM,
+						       tmp);
+			pnp_res->index = tmp;
+			res = &pnp_res->res;
 			res->start = ret;
 			res->flags = IORESOURCE_MEM;
 		}
@@ -959,7 +965,10 @@ static int isapnp_read_resources(struct pnp_dev *dev)
 			     8);
 			if (!ret)
 				continue;
-			res = pnp_get_resource(dev, IORESOURCE_IRQ, tmp);
+			pnp_res = pnp_get_pnp_resource(dev, IORESOURCE_IRQ,
+						       tmp);
+			pnp_res->index = tmp;
+			res = &pnp_res->res;
 			res->start = res->end = ret;
 			res->flags = IORESOURCE_IRQ;
 		}
@@ -967,7 +976,10 @@ static int isapnp_read_resources(struct pnp_dev *dev)
 			ret = isapnp_read_byte(ISAPNP_CFG_DMA + tmp);
 			if (ret == 4)
 				continue;
-			res = pnp_get_resource(dev, IORESOURCE_DMA, tmp);
+			pnp_res = pnp_get_pnp_resource(dev, IORESOURCE_DMA,
+						       tmp);
+			pnp_res->index = tmp;
+			res = &pnp_res->res;
 			res->start = res->end = ret;
 			res->flags = IORESOURCE_DMA;
 		}
@@ -989,45 +1001,62 @@ static int isapnp_get_resources(struct pnp_dev *dev)
 
 static int isapnp_set_resources(struct pnp_dev *dev)
 {
+	struct pnp_resource *pnp_res;
 	struct resource *res;
-	int tmp;
+	int tmp, index;
 
 	dev_dbg(&dev->dev, "set resources\n");
 	isapnp_cfg_begin(dev->card->number, dev->number);
 	dev->active = 1;
 	for (tmp = 0; tmp < ISAPNP_MAX_PORT; tmp++) {
-		res = pnp_get_resource(dev, IORESOURCE_IO, tmp);
+		pnp_res = pnp_get_pnp_resource(dev, IORESOURCE_IO, tmp);
+		if (!pnp_res)
+			continue;
+		res = &pnp_res->res;
 		if (pnp_resource_valid(res)) {
+			index = pnp_res->index;
 			dev_dbg(&dev->dev, "  set io  %d to %#llx\n",
-				tmp, (unsigned long long) res->start);
-			isapnp_write_word(ISAPNP_CFG_PORT + (tmp << 1),
+				index, (unsigned long long) res->start);
+			isapnp_write_word(ISAPNP_CFG_PORT + (index << 1),
 					  res->start);
 		}
 	}
 	for (tmp = 0; tmp < ISAPNP_MAX_IRQ; tmp++) {
-		res = pnp_get_resource(dev, IORESOURCE_IRQ, tmp);
+		pnp_res = pnp_get_pnp_resource(dev, IORESOURCE_IRQ, tmp);
+		if (!pnp_res)
+			continue;
+		res = &pnp_res->res;
 		if (pnp_resource_valid(res)) {
 			int irq = res->start;
 			if (irq == 2)
 				irq = 9;
-			dev_dbg(&dev->dev, "  set irq %d to %d\n", tmp, irq);
-			isapnp_write_byte(ISAPNP_CFG_IRQ + (tmp << 1), irq);
+			index = pnp_res->index;
+			dev_dbg(&dev->dev, "  set irq %d to %d\n", index, irq);
+			isapnp_write_byte(ISAPNP_CFG_IRQ + (index << 1), irq);
 		}
 	}
 	for (tmp = 0; tmp < ISAPNP_MAX_DMA; tmp++) {
-		res = pnp_get_resource(dev, IORESOURCE_DMA, tmp);
+		pnp_res = pnp_get_pnp_resource(dev, IORESOURCE_DMA, tmp);
+		if (!pnp_res)
+			continue;
+		res = &pnp_res->res;
 		if (pnp_resource_valid(res)) {
+			index = pnp_res->index;
 			dev_dbg(&dev->dev, "  set dma %d to %lld\n",
-				tmp, (unsigned long long) res->start);
-			isapnp_write_byte(ISAPNP_CFG_DMA + tmp, res->start);
+				index, (unsigned long long) res->start);
+			isapnp_write_byte(ISAPNP_CFG_DMA + index, res->start);
 		}
 	}
 	for (tmp = 0; tmp < ISAPNP_MAX_MEM; tmp++) {
-		res = pnp_get_resource(dev, IORESOURCE_MEM, tmp);
+		pnp_res = pnp_get_pnp_resource(dev, IORESOURCE_MEM, tmp);
+		if (!pnp_res)
+			continue;
+		res = &pnp_res->res;
 		if (pnp_resource_valid(res)) {
+			index = pnp_res->index;
 			dev_dbg(&dev->dev, "  set mem %d to %#llx\n",
-				tmp, (unsigned long long) res->start);
-			isapnp_write_word(ISAPNP_CFG_MEM + (tmp << 3),
+				index, (unsigned long long) res->start);
+			isapnp_write_word(ISAPNP_CFG_MEM + (index << 3),
 					  (res->start >> 8) & 0xffff);
 		}
 	}