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Subject[patch 31/55] PNP: reduce redundancy in pnp_assign_port() and others
Use a temporary "res" pointer to replace repeated lookups in
the pnp resource tables.

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

---
drivers/pnp/manager.c | 108 ++++++++++++++++++++++----------------------------
1 file changed, 48 insertions(+), 60 deletions(-)
Index: work10/drivers/pnp/manager.c
===================================================================
--- work10.orig/drivers/pnp/manager.c 2008-04-28 16:09:25.000000000 -0600
+++ work10/drivers/pnp/manager.c 2008-04-28 16:09:31.000000000 -0600
@@ -19,8 +19,7 @@

static int pnp_assign_port(struct pnp_dev *dev, struct pnp_port *rule, int idx)
{
- resource_size_t *start, *end;
- unsigned long *flags;
+ struct resource *res;

if (idx >= PNP_MAX_PORT) {
dev_err(&dev->dev, "too many I/O port resources\n");
@@ -28,49 +27,46 @@
return 1;
}

- start = &dev->res.port_resource[idx].start;
- end = &dev->res.port_resource[idx].end;
- flags = &dev->res.port_resource[idx].flags;
+ res = &dev->res.port_resource[idx];

/* check if this resource has been manually set, if so skip */
- if (!(dev->res.port_resource[idx].flags & IORESOURCE_AUTO)) {
+ if (!(res->flags & IORESOURCE_AUTO)) {
dev_dbg(&dev->dev, " io %d already set to %#llx-%#llx "
- "flags %#lx\n", idx, (unsigned long long) *start,
- (unsigned long long) *end, *flags);
+ "flags %#lx\n", idx, (unsigned long long) res->start,
+ (unsigned long long) res->end, res->flags);
return 1;
}

/* set the initial values */
- *flags |= rule->flags | IORESOURCE_IO;
- *flags &= ~IORESOURCE_UNSET;
+ res->flags |= rule->flags | IORESOURCE_IO;
+ res->flags &= ~IORESOURCE_UNSET;

if (!rule->size) {
- *flags |= IORESOURCE_DISABLED;
+ res->flags |= IORESOURCE_DISABLED;
dev_dbg(&dev->dev, " io %d disabled\n", idx);
return 1; /* skip disabled resource requests */
}

- *start = rule->min;
- *end = *start + rule->size - 1;
+ res->start = rule->min;
+ res->end = res->start + rule->size - 1;

/* run through until pnp_check_port is happy */
while (!pnp_check_port(dev, idx)) {
- *start += rule->align;
- *end = *start + rule->size - 1;
- if (*start > rule->max || !rule->align) {
+ res->start += rule->align;
+ res->end = res->start + rule->size - 1;
+ if (res->start > rule->max || !rule->align) {
dev_dbg(&dev->dev, " couldn't assign io %d\n", idx);
return 0;
}
}
dev_dbg(&dev->dev, " assign io %d %#llx-%#llx\n", idx,
- (unsigned long long) *start, (unsigned long long) *end);
+ (unsigned long long) res->start, (unsigned long long) res->end);
return 1;
}

static int pnp_assign_mem(struct pnp_dev *dev, struct pnp_mem *rule, int idx)
{
- resource_size_t *start, *end;
- unsigned long *flags;
+ struct resource *res;

if (idx >= PNP_MAX_MEM) {
dev_err(&dev->dev, "too many memory resources\n");
@@ -78,59 +74,56 @@
return 1;
}

- start = &dev->res.mem_resource[idx].start;
- end = &dev->res.mem_resource[idx].end;
- flags = &dev->res.mem_resource[idx].flags;
+ res = &dev->res.mem_resource[idx];

/* check if this resource has been manually set, if so skip */
- if (!(dev->res.mem_resource[idx].flags & IORESOURCE_AUTO)) {
+ if (!(res->flags & IORESOURCE_AUTO)) {
dev_dbg(&dev->dev, " mem %d already set to %#llx-%#llx "
- "flags %#lx\n", idx, (unsigned long long) *start,
- (unsigned long long) *end, *flags);
+ "flags %#lx\n", idx, (unsigned long long) res->start,
+ (unsigned long long) res->end, res->flags);
return 1;
}

/* set the initial values */
- *flags |= rule->flags | IORESOURCE_MEM;
- *flags &= ~IORESOURCE_UNSET;
+ res->flags |= rule->flags | IORESOURCE_MEM;
+ res->flags &= ~IORESOURCE_UNSET;

/* convert pnp flags to standard Linux flags */
if (!(rule->flags & IORESOURCE_MEM_WRITEABLE))
- *flags |= IORESOURCE_READONLY;
+ res->flags |= IORESOURCE_READONLY;
if (rule->flags & IORESOURCE_MEM_CACHEABLE)
- *flags |= IORESOURCE_CACHEABLE;
+ res->flags |= IORESOURCE_CACHEABLE;
if (rule->flags & IORESOURCE_MEM_RANGELENGTH)
- *flags |= IORESOURCE_RANGELENGTH;
+ res->flags |= IORESOURCE_RANGELENGTH;
if (rule->flags & IORESOURCE_MEM_SHADOWABLE)
- *flags |= IORESOURCE_SHADOWABLE;
+ res->flags |= IORESOURCE_SHADOWABLE;

if (!rule->size) {
- *flags |= IORESOURCE_DISABLED;
+ res->flags |= IORESOURCE_DISABLED;
dev_dbg(&dev->dev, " mem %d disabled\n", idx);
return 1; /* skip disabled resource requests */
}

- *start = rule->min;
- *end = *start + rule->size - 1;
+ res->start = rule->min;
+ res->end = res->start + rule->size - 1;

/* run through until pnp_check_mem is happy */
while (!pnp_check_mem(dev, idx)) {
- *start += rule->align;
- *end = *start + rule->size - 1;
- if (*start > rule->max || !rule->align) {
+ res->start += rule->align;
+ res->end = res->start + rule->size - 1;
+ if (res->start > rule->max || !rule->align) {
dev_dbg(&dev->dev, " couldn't assign mem %d\n", idx);
return 0;
}
}
dev_dbg(&dev->dev, " assign mem %d %#llx-%#llx\n", idx,
- (unsigned long long) *start, (unsigned long long) *end);
+ (unsigned long long) res->start, (unsigned long long) res->end);
return 1;
}

static int pnp_assign_irq(struct pnp_dev *dev, struct pnp_irq *rule, int idx)
{
- resource_size_t *start, *end;
- unsigned long *flags;
+ struct resource *res;
int i;

/* IRQ priority: this table is good for i386 */
@@ -144,40 +137,39 @@
return 1;
}

- start = &dev->res.irq_resource[idx].start;
- end = &dev->res.irq_resource[idx].end;
- flags = &dev->res.irq_resource[idx].flags;
+ res = &dev->res.irq_resource[idx];

/* check if this resource has been manually set, if so skip */
- if (!(dev->res.irq_resource[idx].flags & IORESOURCE_AUTO)) {
+ if (!(res->flags & IORESOURCE_AUTO)) {
dev_dbg(&dev->dev, " irq %d already set to %d flags %#lx\n",
- idx, (int) *start, *flags);
+ idx, (int) res->start, res->flags);
return 1;
}

/* set the initial values */
- *flags |= rule->flags | IORESOURCE_IRQ;
- *flags &= ~IORESOURCE_UNSET;
+ res->flags |= rule->flags | IORESOURCE_IRQ;
+ res->flags &= ~IORESOURCE_UNSET;

if (bitmap_empty(rule->map, PNP_IRQ_NR)) {
- *flags |= IORESOURCE_DISABLED;
+ res->flags |= IORESOURCE_DISABLED;
dev_dbg(&dev->dev, " irq %d disabled\n", idx);
return 1; /* skip disabled resource requests */
}

/* TBD: need check for >16 IRQ */
- *start = find_next_bit(rule->map, PNP_IRQ_NR, 16);
- if (*start < PNP_IRQ_NR) {
- *end = *start;
- dev_dbg(&dev->dev, " assign irq %d %d\n", idx, (int) *start);
+ res->start = find_next_bit(rule->map, PNP_IRQ_NR, 16);
+ if (res->start < PNP_IRQ_NR) {
+ res->end = res->start;
+ dev_dbg(&dev->dev, " assign irq %d %d\n", idx,
+ (int) res->start);
return 1;
}
for (i = 0; i < 16; i++) {
if (test_bit(xtab[i], rule->map)) {
- *start = *end = xtab[i];
+ res->start = res->end = xtab[i];
if (pnp_check_irq(dev, idx)) {
dev_dbg(&dev->dev, " assign irq %d %d\n", idx,
- (int) *start);
+ (int) res->start);
return 1;
}
}
@@ -188,8 +180,7 @@

static void pnp_assign_dma(struct pnp_dev *dev, struct pnp_dma *rule, int idx)
{
- resource_size_t *start, *end;
- unsigned long *flags;
+ struct resource *res;
int i;

/* DMA priority: this table is good for i386 */
@@ -202,35 +193,33 @@
return;
}

- start = &dev->res.dma_resource[idx].start;
- end = &dev->res.dma_resource[idx].end;
- flags = &dev->res.dma_resource[idx].flags;
+ res = &dev->res.dma_resource[idx];

/* check if this resource has been manually set, if so skip */
- if (!(dev->res.dma_resource[idx].flags & IORESOURCE_AUTO)) {
+ if (!(res->flags & IORESOURCE_AUTO)) {
dev_dbg(&dev->dev, " dma %d already set to %d flags %#lx\n",
- idx, (int) *start, *flags);
+ idx, (int) res->start, res->flags);
return;
}

/* set the initial values */
- *flags |= rule->flags | IORESOURCE_DMA;
- *flags &= ~IORESOURCE_UNSET;
+ res->flags |= rule->flags | IORESOURCE_DMA;
+ res->flags &= ~IORESOURCE_UNSET;

for (i = 0; i < 8; i++) {
if (rule->map & (1 << xtab[i])) {
- *start = *end = xtab[i];
+ res->start = res->end = xtab[i];
if (pnp_check_dma(dev, idx)) {
dev_dbg(&dev->dev, " assign dma %d %d\n", idx,
- (int) *start);
+ (int) res->start);
return;
}
}
}
#ifdef MAX_DMA_CHANNELS
- *start = *end = MAX_DMA_CHANNELS;
+ res->start = res->end = MAX_DMA_CHANNELS;
#endif
- *flags |= IORESOURCE_UNSET | IORESOURCE_DISABLED;
+ res->flags |= IORESOURCE_UNSET | IORESOURCE_DISABLED;
dev_dbg(&dev->dev, " disable dma %d\n", idx);
}

--


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