4 files changed, 27 insertions, 12 deletions

diff --git a/arch/ia64/kernel/process.c b/arch/ia64/kernel/process.c
index d1c3ed9943e5..af73b8dfde28 100644
--- a/arch/ia64/kernel/process.c
+++ b/arch/ia64/kernel/process.c
@@ -763,6 +763,9 @@ get_wchan (struct task_struct *p)
         unsigned long ip;
         int count = 0;
 
+        if (!p || p == current || p->state == TASK_RUNNING)
+                return 0;
+
         /*
          * Note: p may not be a blocked task (it could be current or
          * another process running on some other CPU.  Rather than
@@ -773,6 +776,8 @@ get_wchan (struct task_struct *p)
          */
         unw_init_from_blocked_task(&info, p);
         do {
+                if (p->state == TASK_RUNNING)
+                        return 0;
                 if (unw_unwind(&info) < 0)
                         return 0;
                 unw_get_ip(&info, &ip);
diff --git a/arch/ia64/kernel/unwind.c b/arch/ia64/kernel/unwind.c
index 7d3dd6cdafa4..b0b08b5f3eca 100644
--- a/arch/ia64/kernel/unwind.c
+++ b/arch/ia64/kernel/unwind.c
@@ -1860,7 +1860,7 @@ int
 unw_unwind (struct unw_frame_info *info)
 {
         unsigned long prev_ip, prev_sp, prev_bsp;
-        unsigned long ip, pr, num_regs;
+        unsigned long ip, pr, num_regs, rp_loc, pfs_loc;
         STAT(unsigned long start, flags;)
         int retval;
 
@@ -1870,14 +1870,16 @@ unw_unwind (struct unw_frame_info *info)
         prev_sp = info->sp;
         prev_bsp = info->bsp;
 
-        /* restore the ip */
-        if (!info->rp_loc) {
+        /* validate the return IP pointer */
+        rp_loc = (unsigned long) info->rp_loc;
+        if ((rp_loc < info->regstk.limit) || (rp_loc > info->regstk.top)) {
                 /* FIXME: should really be level 0 but it occurs too often. KAO */
                 UNW_DPRINT(1, "unwind.%s: failed to locate return link (ip=0x%lx)!\n",
                            __FUNCTION__, info->ip);
                 STAT(unw.stat.api.unwind_time += ia64_get_itc() - start; local_irq_restore(flags));
                 return -1;
         }
+        /* restore the ip */
         ip = info->ip = *info->rp_loc;
         if (ip < GATE_ADDR) {
                 UNW_DPRINT(2, "unwind.%s: reached user-space (ip=0x%lx)\n", __FUNCTION__, ip);
@@ -1885,12 +1887,14 @@ unw_unwind (struct unw_frame_info *info)
                 return -1;
         }
 
-        /* restore the cfm: */
-        if (!info->pfs_loc) {
+        /* validate the previous stack frame pointer */
+        pfs_loc = (unsigned long) info->pfs_loc;
+        if ((pfs_loc < info->regstk.limit) || (pfs_loc > info->regstk.top)) {
                 UNW_DPRINT(0, "unwind.%s: failed to locate ar.pfs!\n", __FUNCTION__);
                 STAT(unw.stat.api.unwind_time += ia64_get_itc() - start; local_irq_restore(flags));
                 return -1;
         }
+        /* restore the cfm: */
         info->cfm_loc = info->pfs_loc;
 
         /* restore the bsp: */
@@ -1992,13 +1996,16 @@ init_frame_info (struct unw_frame_info *info, struct task_struct *t,
         memset(info, 0, sizeof(*info));
 
         rbslimit = (unsigned long) t + IA64_RBS_OFFSET;
+        stklimit = (unsigned long) t + IA64_STK_OFFSET;
+
         rbstop   = sw->ar_bspstore;
-        if (rbstop - (unsigned long) t >= IA64_STK_OFFSET)
+        if (rbstop > stklimit || rbstop < rbslimit)
                 rbstop = rbslimit;
 
-        stklimit = (unsigned long) t + IA64_STK_OFFSET;
         if (stktop <= rbstop)
                 stktop = rbstop;
+        if (stktop > stklimit)
+                stktop = stklimit;
 
         info->regstk.limit = rbslimit;
         info->regstk.top   = rbstop;
diff --git a/arch/ia64/pci/pci.c b/arch/ia64/pci/pci.c
index 3549f3b42592..73696b4a2eed 100644
--- a/arch/ia64/pci/pci.c
+++ b/arch/ia64/pci/pci.c
@@ -354,10 +354,13 @@ pci_acpi_scan_root(struct acpi_device *device, int domain, int bus)
 
         acpi_walk_resources(device->handle, METHOD_NAME__CRS, count_window,
                         &windows);
-        controller->window = kmalloc_node(sizeof(*controller->window) * windows,
-                        GFP_KERNEL, controller->node);
-        if (!controller->window)
-                goto out2;
+        if (windows) {
+                controller->window =
+                        kmalloc_node(sizeof(*controller->window) * windows,
+                                     GFP_KERNEL, controller->node);
+                if (!controller->window)
+                        goto out2;
+        }
 
         name = kmalloc(16, GFP_KERNEL);
         if (!name)
diff --git a/arch/ia64/sn/kernel/setup.c b/arch/ia64/sn/kernel/setup.c
index a574fcd163dd..684b1c984a44 100644
--- a/arch/ia64/sn/kernel/setup.c
+++ b/arch/ia64/sn/kernel/setup.c
@@ -194,7 +194,7 @@ void __init early_sn_setup(void)
 }
 
 extern int platform_intr_list[];
-static int __initdata shub_1_1_found;
+static int __cpuinitdata shub_1_1_found;
 
 /*
  * sn_check_for_wars