pcmcia: validate late-added resources

Currently, only those mem resources are validated which are already
registered at the time the first PCMCIA card is inserted. As we can
only validate resources immediately after card insert, store
"registered" mem resources in mem_db, and only upon validation move
them to mem_db_valid. When allocationg mem resources, mem_db_valid is
then preferred to mem_db.

Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>

1 files changed, 48 insertions, 19 deletions

diff --git a/drivers/pcmcia/rsrc_nonstatic.c b/drivers/pcmcia/rsrc_nonstatic.c
index a06881c3b96..a69eed6c5b9 100644
--- a/drivers/pcmcia/rsrc_nonstatic.c
+++ b/drivers/pcmcia/rsrc_nonstatic.c
@@ -55,8 +55,8 @@ struct resource_map {
 
 struct socket_data {
         struct resource_map             mem_db;
+        struct resource_map             mem_db_valid;
         struct resource_map             io_db;
-        unsigned int                    rsrc_mem_probe;
 };
 
 #define MEM_PROBE_LOW   (1 << 0)
@@ -357,6 +357,7 @@ static int do_validate_mem(struct pcmcia_socket *s,
                                          struct resource *res,
                                          unsigned int *value))
 {
+        struct socket_data *s_data = s->resource_data;
         struct resource *res1, *res2;
         unsigned int info1 = 1, info2 = 1;
         int ret = -EINVAL;
@@ -382,6 +383,12 @@ static int do_validate_mem(struct pcmcia_socket *s,
         if ((ret) || (info1 != info2) || (info1 == 0))
                 return -EINVAL;
 
+        if (validate && !s->fake_cis) {
+                /* move it to the validated data set */
+                add_interval(&s_data->mem_db_valid, base, size);
+                sub_interval(&s_data->mem_db, base, size);
+        }
+
         return 0;
 }
 
@@ -491,6 +498,8 @@ static int validate_mem(struct pcmcia_socket *s, unsigned int probe_mask)
         if (probe_mask & MEM_PROBE_HIGH) {
                 if (inv_probe(s_data->mem_db.next, s) > 0)
                         return 0;
+                if (s_data->mem_db_valid.next != &s_data->mem_db_valid)
+                        return 0;
                 dev_printk(KERN_NOTICE, &s->dev,
                            "cs: warning: no high memory space available!\n");
                 return -ENODEV;
@@ -565,21 +574,18 @@ static int pcmcia_nonstatic_validate_mem(struct pcmcia_socket *s)
 {
         struct socket_data *s_data = s->resource_data;
         unsigned int probe_mask = MEM_PROBE_LOW;
-        int ret = 0;
+        int ret;
 
-        if (!probe_mem)
+        if (!probe_mem || !(s->state & SOCKET_PRESENT))
                 return 0;
 
         if (s->features & SS_CAP_PAGE_REGS)
                 probe_mask = MEM_PROBE_HIGH;
 
-        if (probe_mask & ~s_data->rsrc_mem_probe) {
-                if (s->state & SOCKET_PRESENT) {
-                        ret = validate_mem(s, probe_mask);
-                        if (!ret)
-                                s_data->rsrc_mem_probe |= probe_mask;
-                }
-        }
+        ret = validate_mem(s, probe_mask);
+
+        if (s_data->mem_db_valid.next != &s_data->mem_db_valid)
+                return 0;
 
         return ret;
 }
@@ -723,15 +729,15 @@ static struct resource *nonstatic_find_mem_region(u_long base, u_long num,
         struct socket_data *s_data = s->resource_data;
         struct pcmcia_align_data data;
         unsigned long min, max;
-        int ret, i;
+        int ret, i, j;
 
         low = low || !(s->features & SS_CAP_PAGE_REGS);
 
         data.mask = align - 1;
         data.offset = base & data.mask;
-        data.map = &s_data->mem_db;
 
         for (i = 0; i < 2; i++) {
+                data.map = &s_data->mem_db_valid;
                 if (low) {
                         max = 0x100000UL;
                         min = base < max ? base : 0;
@@ -740,15 +746,23 @@ static struct resource *nonstatic_find_mem_region(u_long base, u_long num,
                         min = 0x100000UL + base;
                 }
 
+                for (j = 0; j < 2; j++) {
 #ifdef CONFIG_PCI
-                if (s->cb_dev) {
-                        ret = pci_bus_alloc_resource(s->cb_dev->bus, res, num,
-                                                     1, min, 0,
-                                                     pcmcia_align, &data);
-                } else
+                        if (s->cb_dev) {
+                                ret = pci_bus_alloc_resource(s->cb_dev->bus,
+                                                        res, num, 1, min, 0,
+                                                        pcmcia_align, &data);
+                        } else
 #endif
-                        ret = allocate_resource(&iomem_resource, res, num, min,
-                                                max, 1, pcmcia_align, &data);
+                        {
+                                ret = allocate_resource(&iomem_resource,
+                                                        res, num, min, max, 1,
+                                                        pcmcia_align, &data);
+                        }
+                        if (ret == 0)
+                                break;
+                        data.map = &s_data->mem_db;
+                }
                 if (ret == 0 || low)
                         break;
                 low = 1;
@@ -901,6 +915,7 @@ static int nonstatic_init(struct pcmcia_socket *s)
                 return -ENOMEM;
 
         data->mem_db.next = &data->mem_db;
+        data->mem_db_valid.next = &data->mem_db_valid;
         data->io_db.next = &data->io_db;
 
         s->resource_data = (void *) data;
@@ -915,6 +930,10 @@ static void nonstatic_release_resource_db(struct pcmcia_socket *s)
         struct socket_data *data = s->resource_data;
         struct resource_map *p, *q;
 
+        for (p = data->mem_db_valid.next; p != &data->mem_db_valid; p = q) {
+                q = p->next;
+                kfree(p);
+        }
         for (p = data->mem_db.next; p != &data->mem_db; p = q) {
                 q = p->next;
                 kfree(p);
@@ -1010,6 +1029,16 @@ static ssize_t show_mem_db(struct device *dev,
         mutex_lock(&s->ops_mutex);
         data = s->resource_data;
 
+        for (p = data->mem_db_valid.next; p != &data->mem_db_valid;
+             p = p->next) {
+                if (ret > (PAGE_SIZE - 10))
+                        continue;
+                ret += snprintf(&buf[ret], (PAGE_SIZE - ret - 1),
+                                "0x%08lx - 0x%08lx\n",
+                                ((unsigned long) p->base),
+                                ((unsigned long) p->base + p->num - 1));
+        }
+
         for (p = data->mem_db.next; p != &data->mem_db; p = p->next) {
                 if (ret > (PAGE_SIZE - 10))
                         continue;