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>
Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/drivers/pnp/manager.c b/drivers/pnp/manager.c
index 8267efd..be21dec 100644 (file)
--- a/drivers/pnp/manager.c
+++ b/drivers/pnp/manager.c
@@ -19,8 +19,7 @@ DEFINE_MUTEX(pnp_res_mutex);
 
 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 @@ static int pnp_assign_port(struct pnp_dev *dev, struct pnp_port *rule, int idx)
                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 @@ static int pnp_assign_mem(struct pnp_dev *dev, struct pnp_mem *rule, int idx)
                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 @@ static int pnp_assign_irq(struct pnp_dev *dev, struct pnp_irq *rule, int idx)
                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 int pnp_assign_irq(struct pnp_dev *dev, struct pnp_irq *rule, int idx)
 
 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 @@ static void pnp_assign_dma(struct pnp_dev *dev, struct pnp_dma *rule, int idx)
                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);
 }