6 files changed, 61 insertions, 18 deletions

diff --git a/arch/s390/kernel/compat_ptrace.h b/arch/s390/kernel/compat_ptrace.h
index cde81fa64f89..a2be3a978d5c 100644
--- a/arch/s390/kernel/compat_ptrace.h
+++ b/arch/s390/kernel/compat_ptrace.h
@@ -42,6 +42,7 @@ struct user_regs_struct32
         u32 gprs[NUM_GPRS];
         u32 acrs[NUM_ACRS];
         u32 orig_gpr2;
+        /* nb: there's a 4-byte hole here */
         s390_fp_regs fp_regs;
         /*
          * These per registers are in here so that gdb can modify them
diff --git a/arch/s390/kernel/ptrace.c b/arch/s390/kernel/ptrace.c
index 2815bfe348a6..c8b08289eb87 100644
--- a/arch/s390/kernel/ptrace.c
+++ b/arch/s390/kernel/ptrace.c
@@ -170,6 +170,13 @@ static unsigned long __peek_user(struct task_struct *child, addr_t addr)
                  */
                 tmp = (addr_t) task_pt_regs(child)->orig_gpr2;
 
+        } else if (addr < (addr_t) &dummy->regs.fp_regs) {
+                /*
+                 * prevent reads of padding hole between
+                 * orig_gpr2 and fp_regs on s390.
+                 */
+                tmp = 0;
+
         } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) {
                 /* 
                  * floating point regs. are stored in the thread structure
@@ -270,6 +277,13 @@ static int __poke_user(struct task_struct *child, addr_t addr, addr_t data)
                  */
                 task_pt_regs(child)->orig_gpr2 = data;
 
+        } else if (addr < (addr_t) &dummy->regs.fp_regs) {
+                /*
+                 * prevent writes of padding hole between
+                 * orig_gpr2 and fp_regs on s390.
+                 */
+                return 0;
+
         } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) {
                 /*
                  * floating point regs. are stored in the thread structure
@@ -428,6 +442,13 @@ static u32 __peek_user_compat(struct task_struct *child, addr_t addr)
                  */
                 tmp = *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4);
 
+        } else if (addr < (addr_t) &dummy32->regs.fp_regs) {
+                /*
+                 * prevent reads of padding hole between
+                 * orig_gpr2 and fp_regs on s390.
+                 */
+                tmp = 0;
+
         } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) {
                 /*
                  * floating point regs. are stored in the thread structure 
@@ -514,6 +535,13 @@ static int __poke_user_compat(struct task_struct *child,
                  */
                 *(__u32*)((addr_t) &task_pt_regs(child)->orig_gpr2 + 4) = tmp;
 
+        } else if (addr < (addr_t) &dummy32->regs.fp_regs) {
+                /*
+                 * prevent writess of padding hole between
+                 * orig_gpr2 and fp_regs on s390.
+                 */
+                return 0;
+
         } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) {
                 /*
                  * floating point regs. are stored in the thread structure 
diff --git a/drivers/s390/cio/chp.c b/drivers/s390/cio/chp.c
index db00b0591733..f1216cf6fa8f 100644
--- a/drivers/s390/cio/chp.c
+++ b/drivers/s390/cio/chp.c
@@ -423,7 +423,7 @@ int chp_new(struct chp_id chpid)
         ret = sysfs_create_group(&chp->dev.kobj, &chp_attr_group);
         if (ret) {
                 device_unregister(&chp->dev);
-                goto out_free;
+                goto out;
         }
         mutex_lock(&channel_subsystems[chpid.cssid]->mutex);
         if (channel_subsystems[chpid.cssid]->cm_enabled) {
@@ -432,14 +432,15 @@ int chp_new(struct chp_id chpid)
                         sysfs_remove_group(&chp->dev.kobj, &chp_attr_group);
                         device_unregister(&chp->dev);
                         mutex_unlock(&channel_subsystems[chpid.cssid]->mutex);
-                        goto out_free;
+                        goto out;
                 }
         }
         channel_subsystems[chpid.cssid]->chps[chpid.id] = chp;
         mutex_unlock(&channel_subsystems[chpid.cssid]->mutex);
-        return ret;
+        goto out;
 out_free:
         kfree(chp);
+out:
         return ret;
 }
 
diff --git a/drivers/s390/cio/cio.c b/drivers/s390/cio/cio.c
index 33bff8fec7d1..5954b905e3ca 100644
--- a/drivers/s390/cio/cio.c
+++ b/drivers/s390/cio/cio.c
@@ -208,8 +208,10 @@ cio_start_key (struct subchannel *sch,	/* subchannel structure */
         case 1:         /* status pending */
         case 2:         /* busy */
                 return -EBUSY;
-        default:                /* device/path not operational */
+        case 3:         /* device/path not operational */
                 return cio_start_handle_notoper(sch, lpm);
+        default:
+                return ccode;
         }
 }
 
diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index 51489eff6b0b..1261e1a9e8cd 100644
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -633,6 +633,11 @@ channel_subsystem_release(struct device *dev)
 
         css = to_css(dev);
         mutex_destroy(&css->mutex);
+        if (css->pseudo_subchannel) {
+                /* Implies that it has been generated but never registered. */
+                css_subchannel_release(&css->pseudo_subchannel->dev);
+                css->pseudo_subchannel = NULL;
+        }
         kfree(css);
 }
 
@@ -785,11 +790,15 @@ init_channel_subsystem (void)
                 }
                 channel_subsystems[i] = css;
                 ret = setup_css(i);
-                if (ret)
-                        goto out_free;
+                if (ret) {
+                        kfree(channel_subsystems[i]);
+                        goto out_unregister;
+                }
                 ret = device_register(&css->device);
-                if (ret)
-                        goto out_free_all;
+                if (ret) {
+                        put_device(&css->device);
+                        goto out_unregister;
+                }
                 if (css_chsc_characteristics.secm) {
                         ret = device_create_file(&css->device,
                                                  &dev_attr_cm_enable);
@@ -802,7 +811,7 @@ init_channel_subsystem (void)
         }
         ret = register_reboot_notifier(&css_reboot_notifier);
         if (ret)
-                goto out_pseudo;
+                goto out_unregister;
         css_init_done = 1;
 
         /* Enable default isc for I/O subchannels. */
@@ -810,18 +819,12 @@ init_channel_subsystem (void)
 
         for_each_subchannel(__init_channel_subsystem, NULL);
         return 0;
-out_pseudo:
-        device_unregister(&channel_subsystems[i]->pseudo_subchannel->dev);
 out_file:
-        device_remove_file(&channel_subsystems[i]->device,
-                           &dev_attr_cm_enable);
+        if (css_chsc_characteristics.secm)
+                device_remove_file(&channel_subsystems[i]->device,
+                                   &dev_attr_cm_enable);
 out_device:
         device_unregister(&channel_subsystems[i]->device);
-out_free_all:
-        kfree(channel_subsystems[i]->pseudo_subchannel->lock);
-        kfree(channel_subsystems[i]->pseudo_subchannel);
-out_free:
-        kfree(channel_subsystems[i]);
 out_unregister:
         while (i > 0) {
                 struct channel_subsystem *css;
@@ -829,6 +832,7 @@ out_unregister:
                 i--;
                 css = channel_subsystems[i];
                 device_unregister(&css->pseudo_subchannel->dev);
+                css->pseudo_subchannel = NULL;
                 if (css_chsc_characteristics.secm)
                         device_remove_file(&css->device,
                                            &dev_attr_cm_enable);
diff --git a/drivers/s390/cio/device_fsm.c b/drivers/s390/cio/device_fsm.c
index 550508df952b..84cc9ea346db 100644
--- a/drivers/s390/cio/device_fsm.c
+++ b/drivers/s390/cio/device_fsm.c
@@ -658,6 +658,13 @@ ccw_device_offline(struct ccw_device *cdev)
 {
         struct subchannel *sch;
 
+        /* Allow ccw_device_offline while disconnected. */
+        if (cdev->private->state == DEV_STATE_DISCONNECTED ||
+            cdev->private->state == DEV_STATE_NOT_OPER) {
+                cdev->private->flags.donotify = 0;
+                ccw_device_done(cdev, DEV_STATE_NOT_OPER);
+                return 0;
+        }
         if (ccw_device_is_orphan(cdev)) {
                 ccw_device_done(cdev, DEV_STATE_OFFLINE);
                 return 0;