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Subject[patch 09/15] PNP: make resource assignment functions return 0 (success) or -EBUSY (failure)
This patch doesn't change any behavior; it just makes the return
values more conventional.

This changes pnp_assign_dma() from a void function to one that
returns an int, just like the other assignment functions. For
now, at least, pnp_assign_dma() always returns 0 (success), so
it appears to never fail, just like before.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>

Index: work10/drivers/pnp/manager.c
===================================================================
--- work10.orig/drivers/pnp/manager.c 2008-05-13 13:27:01.000000000 -0600
+++ work10/drivers/pnp/manager.c 2008-05-13 13:29:05.000000000 -0600
@@ -26,7 +26,7 @@ static int pnp_assign_port(struct pnp_de
dev_dbg(&dev->dev, " io %d already set to %#llx-%#llx "
"flags %#lx\n", idx, (unsigned long long) res->start,
(unsigned long long) res->end, res->flags);
- return 1;
+ return 0;
}

res = &local_res;
@@ -51,13 +51,13 @@ static int pnp_assign_port(struct pnp_de
"(min %#llx max %#llx)\n", idx,
(unsigned long long) rule->min,
(unsigned long long) rule->max);
- return 0;
+ return -EBUSY;
}
}

__add:
pnp_add_io_resource(dev, res->start, res->end, res->flags);
- return 1;
+ return 0;
}

static int pnp_assign_mem(struct pnp_dev *dev, struct pnp_mem *rule, int idx)
@@ -69,7 +69,7 @@ static int pnp_assign_mem(struct pnp_dev
dev_dbg(&dev->dev, " mem %d already set to %#llx-%#llx "
"flags %#lx\n", idx, (unsigned long long) res->start,
(unsigned long long) res->end, res->flags);
- return 1;
+ return 0;
}

res = &local_res;
@@ -103,13 +103,13 @@ static int pnp_assign_mem(struct pnp_dev
"(min %#llx max %#llx)\n", idx,
(unsigned long long) rule->min,
(unsigned long long) rule->max);
- return 0;
+ return -EBUSY;
}
}

__add:
pnp_add_mem_resource(dev, res->start, res->end, res->flags);
- return 1;
+ return 0;
}

static int pnp_assign_irq(struct pnp_dev *dev, struct pnp_irq *rule, int idx)
@@ -126,7 +126,7 @@ static int pnp_assign_irq(struct pnp_dev
if (res) {
dev_dbg(&dev->dev, " irq %d already set to %d flags %#lx\n",
idx, (int) res->start, res->flags);
- return 1;
+ return 0;
}

res = &local_res;
@@ -154,14 +154,14 @@ static int pnp_assign_irq(struct pnp_dev
}
}
dev_dbg(&dev->dev, " couldn't assign irq %d\n", idx);
- return 0;
+ return -EBUSY;

__add:
pnp_add_irq_resource(dev, res->start, res->flags);
- return 1;
+ return 0;
}

-static void pnp_assign_dma(struct pnp_dev *dev, struct pnp_dma *rule, int idx)
+static int pnp_assign_dma(struct pnp_dev *dev, struct pnp_dma *rule, int idx)
{
struct resource *res, local_res;
int i;
@@ -175,7 +175,7 @@ static void pnp_assign_dma(struct pnp_de
if (res) {
dev_dbg(&dev->dev, " dma %d already set to %d flags %#lx\n",
idx, (int) res->start, res->flags);
- return;
+ return 0;
}

res = &local_res;
@@ -198,6 +198,7 @@ static void pnp_assign_dma(struct pnp_de

__add:
pnp_add_dma_resource(dev, res->start, res->flags);
+ return 0;
}

void pnp_init_resources(struct pnp_dev *dev)
@@ -243,25 +244,26 @@ static int pnp_assign_resources(struct p
irq = dev->independent->irq;
dma = dev->independent->dma;
while (port) {
- if (!pnp_assign_port(dev, port, nport))
+ if (pnp_assign_port(dev, port, nport) < 0)
goto fail;
nport++;
port = port->next;
}
while (mem) {
- if (!pnp_assign_mem(dev, mem, nmem))
+ if (pnp_assign_mem(dev, mem, nmem) < 0)
goto fail;
nmem++;
mem = mem->next;
}
while (irq) {
- if (!pnp_assign_irq(dev, irq, nirq))
+ if (pnp_assign_irq(dev, irq, nirq) < 0)
goto fail;
nirq++;
irq = irq->next;
}
while (dma) {
- pnp_assign_dma(dev, dma, ndma);
+ if (pnp_assign_dma(dev, dma, ndma) < 0)
+ goto fail;
ndma++;
dma = dma->next;
}
@@ -281,25 +283,26 @@ static int pnp_assign_resources(struct p
irq = dep->irq;
dma = dep->dma;
while (port) {
- if (!pnp_assign_port(dev, port, nport))
+ if (pnp_assign_port(dev, port, nport) < 0)
goto fail;
nport++;
port = port->next;
}
while (mem) {
- if (!pnp_assign_mem(dev, mem, nmem))
+ if (pnp_assign_mem(dev, mem, nmem) < 0)
goto fail;
nmem++;
mem = mem->next;
}
while (irq) {
- if (!pnp_assign_irq(dev, irq, nirq))
+ if (pnp_assign_irq(dev, irq, nirq) < 0)
goto fail;
nirq++;
irq = irq->next;
}
while (dma) {
- pnp_assign_dma(dev, dma, ndma);
+ if (pnp_assign_dma(dev, dma, ndma) < 0)
+ goto fail;
ndma++;
dma = dma->next;
}
--


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