1 files changed, 179 insertions, 106 deletions

diff --git a/drivers/pcmcia/rsrc_nonstatic.c b/drivers/pcmcia/rsrc_nonstatic.c
index c67638fe6914..4663b3fa9f96 100644
--- a/drivers/pcmcia/rsrc_nonstatic.c
+++ b/drivers/pcmcia/rsrc_nonstatic.c
@@ -55,11 +55,10 @@ 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;
 };
 
-static DEFINE_MUTEX(rsrc_mutex);
 #define MEM_PROBE_LOW   (1 << 0)
 #define MEM_PROBE_HIGH  (1 << 1)
 
@@ -125,8 +124,10 @@ static int add_interval(struct resource_map *map, u_long base, u_long num)
         struct resource_map *p, *q;
 
         for (p = map; ; p = p->next) {
-                if ((p != map) && (p->base+p->num-1 >= base))
-                        return -1;
+                if ((p != map) && (p->base+p->num >= base)) {
+                        p->num = max(num + base - p->base, p->num);
+                        return 0;
+                }
                 if ((p->next == map) || (p->next->base > base+num-1))
                         break;
         }
@@ -264,36 +265,44 @@ static void do_io_probe(struct pcmcia_socket *s, unsigned int base,
 }
 #endif
 
-/*======================================================================
-
-    This is tricky... when we set up CIS memory, we try to validate
-    the memory window space allocations.
-
-======================================================================*/
+/*======================================================================*/
 
-/* Validation function for cards with a valid CIS */
+/**
+ * readable() - iomem validation function for cards with a valid CIS
+ */
 static int readable(struct pcmcia_socket *s, struct resource *res,
                     unsigned int *count)
 {
-        int ret = -1;
+        int ret = -EINVAL;
+
+        if (s->fake_cis) {
+                dev_dbg(&s->dev, "fake CIS is being used: can't validate mem\n");
+                return 0;
+        }
 
         s->cis_mem.res = res;
         s->cis_virt = ioremap(res->start, s->map_size);
         if (s->cis_virt) {
-                ret = pccard_validate_cis(s, count);
-                /* invalidate mapping and CIS cache */
+                mutex_unlock(&s->ops_mutex);
+                /* as we're only called from pcmcia.c, we're safe */
+                if (s->callback->validate)
+                        ret = s->callback->validate(s, count);
+                /* invalidate mapping */
+                mutex_lock(&s->ops_mutex);
                 iounmap(s->cis_virt);
                 s->cis_virt = NULL;
-                destroy_cis_cache(s);
         }
         s->cis_mem.res = NULL;
-        if ((ret != 0) || (*count == 0))
-                return 0;
-        return 1;
+        if ((ret) || (*count == 0))
+                return -EINVAL;
+        return 0;
 }
 
-/* Validation function for simple memory cards */
-static int checksum(struct pcmcia_socket *s, struct resource *res)
+/**
+ * checksum() - iomem validation function for simple memory cards
+ */
+static int checksum(struct pcmcia_socket *s, struct resource *res,
+                    unsigned int *value)
 {
         pccard_mem_map map;
         int i, a = 0, b = -1, d;
@@ -321,61 +330,90 @@ static int checksum(struct pcmcia_socket *s, struct resource *res)
                 iounmap(virt);
         }
 
-        return (b == -1) ? -1 : (a>>1);
+        if (b == -1)
+                return -EINVAL;
+
+        *value = a;
+
+        return 0;
 }
 
-static int
-cis_readable(struct pcmcia_socket *s, unsigned long base, unsigned long size)
+/**
+ * do_validate_mem() - low level validate a memory region for PCMCIA use
+ * @s:          PCMCIA socket to validate
+ * @base:       start address of resource to check
+ * @size:       size of resource to check
+ * @validate:   validation function to use
+ *
+ * do_validate_mem() splits up the memory region which is to be checked
+ * into two parts. Both are passed to the @validate() function. If
+ * @validate() returns non-zero, or the value parameter to @validate()
+ * is zero, or the value parameter is different between both calls,
+ * the check fails, and -EINVAL is returned. Else, 0 is returned.
+ */
+static int do_validate_mem(struct pcmcia_socket *s,
+                           unsigned long base, unsigned long size,
+                           int validate (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, info2;
-        int ret = 0;
+        unsigned int info1 = 1, info2 = 1;
+        int ret = -EINVAL;
 
         res1 = claim_region(s, base, size/2, IORESOURCE_MEM, "PCMCIA memprobe");
         res2 = claim_region(s, base + size/2, size/2, IORESOURCE_MEM,
                         "PCMCIA memprobe");
 
         if (res1 && res2) {
-                ret = readable(s, res1, &info1);
-                ret += readable(s, res2, &info2);
+                ret = 0;
+                if (validate) {
+                        ret = validate(s, res1, &info1);
+                        ret += validate(s, res2, &info2);
+                }
         }
 
         free_region(res2);
         free_region(res1);
 
-        return (ret == 2) && (info1 == info2);
-}
+        dev_dbg(&s->dev, "cs: memory probe 0x%06lx-0x%06lx: %p %p %u %u %u",
+                base, base+size-1, res1, res2, ret, info1, info2);
 
-static int
-checksum_match(struct pcmcia_socket *s, unsigned long base, unsigned long size)
-{
-        struct resource *res1, *res2;
-        int a = -1, b = -1;
-
-        res1 = claim_region(s, base, size/2, IORESOURCE_MEM, "PCMCIA memprobe");
-        res2 = claim_region(s, base + size/2, size/2, IORESOURCE_MEM,
-                        "PCMCIA memprobe");
+        if ((ret) || (info1 != info2) || (info1 == 0))
+                return -EINVAL;
 
-        if (res1 && res2) {
-                a = checksum(s, res1);
-                b = checksum(s, res2);
+        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);
         }
 
-        free_region(res2);
-        free_region(res1);
-
-        return (a == b) && (a >= 0);
+        return 0;
 }
 
-/*======================================================================
-
-    The memory probe.  If the memory list includes a 64K-aligned block
-    below 1MB, we probe in 64K chunks, and as soon as we accumulate at
-    least mem_limit free space, we quit.
-
-======================================================================*/
 
-static int do_mem_probe(u_long base, u_long num, struct pcmcia_socket *s)
+/**
+ * do_mem_probe() - validate a memory region for PCMCIA use
+ * @s:          PCMCIA socket to validate
+ * @base:       start address of resource to check
+ * @num:        size of resource to check
+ * @validate:   validation function to use
+ * @fallback:   validation function to use if validate fails
+ *
+ * do_mem_probe() checks a memory region for use by the PCMCIA subsystem.
+ * To do so, the area is split up into sensible parts, and then passed
+ * into the @validate() function. Only if @validate() and @fallback() fail,
+ * the area is marked as unavaibale for use by the PCMCIA subsystem. The
+ * function returns the size of the usable memory area.
+ */
+static int do_mem_probe(struct pcmcia_socket *s, u_long base, u_long num,
+                        int validate (struct pcmcia_socket *s,
+                                      struct resource *res,
+                                      unsigned int *value),
+                        int fallback (struct pcmcia_socket *s,
+                                      struct resource *res,
+                                      unsigned int *value))
 {
         struct socket_data *s_data = s->resource_data;
         u_long i, j, bad, fail, step;
@@ -393,15 +431,14 @@ static int do_mem_probe(u_long base, u_long num, struct pcmcia_socket *s)
         for (i = j = base; i < base+num; i = j + step) {
                 if (!fail) {
                         for (j = i; j < base+num; j += step) {
-                                if (cis_readable(s, j, step))
+                                if (!do_validate_mem(s, j, step, validate))
                                         break;
                         }
                         fail = ((i == base) && (j == base+num));
                 }
-                if (fail) {
-                        for (j = i; j < base+num; j += 2*step)
-                                if (checksum_match(s, j, step) &&
-                                        checksum_match(s, j + step, step))
+                if ((fail) && (fallback)) {
+                        for (j = i; j < base+num; j += step)
+                                if (!do_validate_mem(s, j, step, fallback))
                                         break;
                 }
                 if (i != j) {
@@ -416,8 +453,14 @@ static int do_mem_probe(u_long base, u_long num, struct pcmcia_socket *s)
         return num - bad;
 }
 
+
 #ifdef CONFIG_PCMCIA_PROBE
 
+/**
+ * inv_probe() - top-to-bottom search for one usuable high memory area
+ * @s:          PCMCIA socket to validate
+ * @m:          resource_map to check
+ */
 static u_long inv_probe(struct resource_map *m, struct pcmcia_socket *s)
 {
         struct socket_data *s_data = s->resource_data;
@@ -432,9 +475,18 @@ static u_long inv_probe(struct resource_map *m, struct pcmcia_socket *s)
         }
         if (m->base < 0x100000)
                 return 0;
-        return do_mem_probe(m->base, m->num, s);
+        return do_mem_probe(s, m->base, m->num, readable, checksum);
 }
 
+/**
+ * validate_mem() - memory probe function
+ * @s:          PCMCIA socket to validate
+ * @probe_mask: MEM_PROBE_LOW | MEM_PROBE_HIGH
+ *
+ * The memory probe.  If the memory list includes a 64K-aligned block
+ * below 1MB, we probe in 64K chunks, and as soon as we accumulate at
+ * least mem_limit free space, we quit. Returns 0 on usuable ports.
+ */
 static int validate_mem(struct pcmcia_socket *s, unsigned int probe_mask)
 {
         struct resource_map *m, mm;
@@ -446,6 +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;
@@ -457,7 +511,8 @@ static int validate_mem(struct pcmcia_socket *s, unsigned int probe_mask)
                 if (mm.base >= 0x100000)
                         continue;
                 if ((mm.base | mm.num) & 0xffff) {
-                        ok += do_mem_probe(mm.base, mm.num, s);
+                        ok += do_mem_probe(s, mm.base, mm.num, readable,
+                                           checksum);
                         continue;
                 }
                 /* Special probe for 64K-aligned block */
@@ -467,7 +522,8 @@ static int validate_mem(struct pcmcia_socket *s, unsigned int probe_mask)
                                 if (ok >= mem_limit)
                                         sub_interval(&s_data->mem_db, b, 0x10000);
                                 else
-                                        ok += do_mem_probe(b, 0x10000, s);
+                                        ok += do_mem_probe(s, b, 0x10000,
+                                                           readable, checksum);
                         }
                 }
         }
@@ -480,6 +536,13 @@ static int validate_mem(struct pcmcia_socket *s, unsigned int probe_mask)
 
 #else /* CONFIG_PCMCIA_PROBE */
 
+/**
+ * validate_mem() - memory probe function
+ * @s:          PCMCIA socket to validate
+ * @probe_mask: ignored
+ *
+ * Returns 0 on usuable ports.
+ */
 static int validate_mem(struct pcmcia_socket *s, unsigned int probe_mask)
 {
         struct resource_map *m, mm;
@@ -488,7 +551,7 @@ static int validate_mem(struct pcmcia_socket *s, unsigned int probe_mask)
 
         for (m = s_data->mem_db.next; m != &s_data->mem_db; m = mm.next) {
                 mm = *m;
-                ok += do_mem_probe(mm.base, mm.num, s);
+                ok += do_mem_probe(s, mm.base, mm.num, readable, checksum);
         }
         if (ok > 0)
                 return 0;
@@ -498,31 +561,31 @@ static int validate_mem(struct pcmcia_socket *s, unsigned int probe_mask)
 #endif /* CONFIG_PCMCIA_PROBE */
 
 
-/*
+/**
+ * pcmcia_nonstatic_validate_mem() - try to validate iomem for PCMCIA use
+ * @s:          PCMCIA socket to validate
+ *
+ * This is tricky... when we set up CIS memory, we try to validate
+ * the memory window space allocations.
+ *
  * Locking note: Must be called with skt_mutex held!
  */
 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;
 
-        mutex_lock(&rsrc_mutex);
-
         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);
 
-        mutex_unlock(&rsrc_mutex);
+        if (s_data->mem_db_valid.next != &s_data->mem_db_valid)
+                return 0;
 
         return ret;
 }
@@ -602,7 +665,6 @@ static int nonstatic_adjust_io_region(struct resource *res, unsigned long r_star
         struct socket_data *s_data = s->resource_data;
         int ret = -ENOMEM;
 
-        mutex_lock(&rsrc_mutex);
         for (m = s_data->io_db.next; m != &s_data->io_db; m = m->next) {
                 unsigned long start = m->base;
                 unsigned long end = m->base + m->num - 1;
@@ -613,7 +675,6 @@ static int nonstatic_adjust_io_region(struct resource *res, unsigned long r_star
                 ret = adjust_resource(res, r_start, r_end - r_start + 1);
                 break;
         }
-        mutex_unlock(&rsrc_mutex);
 
         return ret;
 }
@@ -647,7 +708,6 @@ static struct resource *nonstatic_find_io_region(unsigned long base, int num,
         data.offset = base & data.mask;
         data.map = &s_data->io_db;
 
-        mutex_lock(&rsrc_mutex);
 #ifdef CONFIG_PCI
         if (s->cb_dev) {
                 ret = pci_bus_alloc_resource(s->cb_dev->bus, res, num, 1,
@@ -656,7 +716,6 @@ static struct resource *nonstatic_find_io_region(unsigned long base, int num,
 #endif
                 ret = allocate_resource(&ioport_resource, res, num, min, ~0UL,
                                         1, pcmcia_align, &data);
-        mutex_unlock(&rsrc_mutex);
 
         if (ret != 0) {
                 kfree(res);
@@ -672,15 +731,15 @@ 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;
@@ -689,17 +748,23 @@ static struct resource *nonstatic_find_mem_region(u_long base, u_long num,
                         min = 0x100000UL + base;
                 }
 
-                mutex_lock(&rsrc_mutex);
+                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);
-                mutex_unlock(&rsrc_mutex);
+                        {
+                                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;
@@ -722,25 +787,18 @@ static int adjust_memory(struct pcmcia_socket *s, unsigned int action, unsigned
         if (end < start)
                 return -EINVAL;
 
-        mutex_lock(&rsrc_mutex);
         switch (action) {
         case ADD_MANAGED_RESOURCE:
                 ret = add_interval(&data->mem_db, start, size);
+                if (!ret)
+                        do_mem_probe(s, start, size, NULL, NULL);
                 break;
         case REMOVE_MANAGED_RESOURCE:
                 ret = sub_interval(&data->mem_db, start, size);
-                if (!ret) {
-                        struct pcmcia_socket *socket;
-                        down_read(&pcmcia_socket_list_rwsem);
-                        list_for_each_entry(socket, &pcmcia_socket_list, socket_list)
-                                release_cis_mem(socket);
-                        up_read(&pcmcia_socket_list_rwsem);
-                }
                 break;
         default:
                 ret = -EINVAL;
         }
-        mutex_unlock(&rsrc_mutex);
 
         return ret;
 }
@@ -758,7 +816,6 @@ static int adjust_io(struct pcmcia_socket *s, unsigned int action, unsigned long
         if (end > IO_SPACE_LIMIT)
                 return -EINVAL;
 
-        mutex_lock(&rsrc_mutex);
         switch (action) {
         case ADD_MANAGED_RESOURCE:
                 if (add_interval(&data->io_db, start, size) != 0) {
@@ -777,7 +834,6 @@ static int adjust_io(struct pcmcia_socket *s, unsigned int action, unsigned long
                 ret = -EINVAL;
                 break;
         }
-        mutex_unlock(&rsrc_mutex);
 
         return ret;
 }
@@ -860,6 +916,7 @@ 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;
@@ -874,7 +931,10 @@ static void nonstatic_release_resource_db(struct pcmcia_socket *s)
         struct socket_data *data = s->resource_data;
         struct resource_map *p, *q;
 
-        mutex_lock(&rsrc_mutex);
+        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);
@@ -883,7 +943,6 @@ static void nonstatic_release_resource_db(struct pcmcia_socket *s)
                 q = p->next;
                 kfree(p);
         }
-        mutex_unlock(&rsrc_mutex);
 }
 
 
@@ -910,7 +969,7 @@ static ssize_t show_io_db(struct device *dev,
         struct resource_map *p;
         ssize_t ret = 0;
 
-        mutex_lock(&rsrc_mutex);
+        mutex_lock(&s->ops_mutex);
         data = s->resource_data;
 
         for (p = data->io_db.next; p != &data->io_db; p = p->next) {
@@ -922,7 +981,7 @@ static ssize_t show_io_db(struct device *dev,
                                 ((unsigned long) p->base + p->num - 1));
         }
 
-        mutex_unlock(&rsrc_mutex);
+        mutex_unlock(&s->ops_mutex);
         return ret;
 }
 
@@ -950,9 +1009,11 @@ static ssize_t store_io_db(struct device *dev,
         if (end_addr < start_addr)
                 return -EINVAL;
 
+        mutex_lock(&s->ops_mutex);
         ret = adjust_io(s, add, start_addr, end_addr);
         if (!ret)
                 s->resource_setup_new = 1;
+        mutex_unlock(&s->ops_mutex);
 
         return ret ? ret : count;
 }
@@ -966,9 +1027,19 @@ static ssize_t show_mem_db(struct device *dev,
         struct resource_map *p;
         ssize_t ret = 0;
 
-        mutex_lock(&rsrc_mutex);
+        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;
@@ -978,7 +1049,7 @@ static ssize_t show_mem_db(struct device *dev,
                                 ((unsigned long) p->base + p->num - 1));
         }
 
-        mutex_unlock(&rsrc_mutex);
+        mutex_unlock(&s->ops_mutex);
         return ret;
 }
 
@@ -1006,9 +1077,11 @@ static ssize_t store_mem_db(struct device *dev,
         if (end_addr < start_addr)
                 return -EINVAL;
 
+        mutex_lock(&s->ops_mutex);
         ret = adjust_memory(s, add, start_addr, end_addr);
         if (!ret)
                 s->resource_setup_new = 1;
+        mutex_unlock(&s->ops_mutex);
 
         return ret ? ret : count;
 }