From: Bjorn Helgaas <bjorn.helgaas@hp.com>
Date: Mon, 28 Apr 2008 22:34:21 +0000 (-0600)
Subject: PNP: check for conflicts with all resources, not just earlier ones
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=db9eaeab3e7ab72d773820820f1ba33960ad24c4;p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git

PNP: check for conflicts with all resources, not just earlier ones

This patch removes a use of "idx" in pnp_check_port() and similar
functions, in preparation for replacing idx with a pointer to the
resource itself.

I split this out because it changes the behavior slightly: we used
to check for conflicts only with earlier resources, e.g., we checked
resource 2 against resources 0 and 1 but not against 3, 4, etc.  Now
we will check against all resources except 2.

Since resources are assigned in ascending order, the old behavior
was probably safe, but I don't like to depend on that ordering.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Acked-By: Rene Herman <rene.herman@gmail.com>
Signed-off-by: Len Brown <len.brown@intel.com>
---

diff --git a/drivers/pnp/resource.c b/drivers/pnp/resource.c
index f89945ebd8b6..eab16e5520ae 100644
--- a/drivers/pnp/resource.c
+++ b/drivers/pnp/resource.c
@@ -270,9 +270,9 @@ int pnp_check_port(struct pnp_dev *dev, int idx)
 	}
 
 	/* check for internal conflicts */
-	for (i = 0; i < PNP_MAX_PORT && i != idx; i++) {
+	for (i = 0; i < PNP_MAX_PORT; i++) {
 		tres = &dev->res.port_resource[i];
-		if (tres->flags & IORESOURCE_IO) {
+		if (tres != res && tres->flags & IORESOURCE_IO) {
 			tport = &tres->start;
 			tend = &tres->end;
 			if (ranged_conflict(port, end, tport, tend))
@@ -331,9 +331,9 @@ int pnp_check_mem(struct pnp_dev *dev, int idx)
 	}
 
 	/* check for internal conflicts */
-	for (i = 0; i < PNP_MAX_MEM && i != idx; i++) {
+	for (i = 0; i < PNP_MAX_MEM; i++) {
 		tres = &dev->res.mem_resource[i];
-		if (tres->flags & IORESOURCE_MEM) {
+		if (tres != res && tres->flags & IORESOURCE_MEM) {
 			taddr = &tres->start;
 			tend = &tres->end;
 			if (ranged_conflict(addr, end, taddr, tend))
@@ -391,9 +391,9 @@ int pnp_check_irq(struct pnp_dev *dev, int idx)
 	}
 
 	/* check for internal conflicts */
-	for (i = 0; i < PNP_MAX_IRQ && i != idx; i++) {
+	for (i = 0; i < PNP_MAX_IRQ; i++) {
 		tres = &dev->res.irq_resource[i];
-		if (tres->flags & IORESOURCE_IRQ) {
+		if (tres != res && tres->flags & IORESOURCE_IRQ) {
 			if (tres->start == *irq)
 				return 0;
 		}
@@ -465,9 +465,9 @@ int pnp_check_dma(struct pnp_dev *dev, int idx)
 	}
 
 	/* check for internal conflicts */
-	for (i = 0; i < PNP_MAX_DMA && i != idx; i++) {
+	for (i = 0; i < PNP_MAX_DMA; i++) {
 		tres = &dev->res.dma_resource[i];
-		if (tres->flags & IORESOURCE_DMA) {
+		if (tres != res && tres->flags & IORESOURCE_DMA) {
 			if (tres->start == *dma)
 				return 0;
 		}