Merge branch 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6

* 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6:
  [S390] s390: fix single stepping on svc0
  [S390] sclp: undo quiesce handler override on resume
  [S390] reset cputime accounting after IPL from NSS
  [S390] monreader: fix use after free bug with suspend/resume

5 files changed, 56 insertions, 18 deletions

diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c
index bf8b4ae7ff2d..e49e9e0c69fd 100644
--- a/arch/s390/kernel/early.c
+++ b/arch/s390/kernel/early.c
@@ -55,6 +55,7 @@ static void __init reset_tod_clock(void)
                 disabled_wait(0);
 
         sched_clock_base_cc = TOD_UNIX_EPOCH;
+        S390_lowcore.last_update_clock = sched_clock_base_cc;
 }
 
 #ifdef CONFIG_SHARED_KERNEL
@@ -167,6 +168,14 @@ static noinline __init void create_kernel_nss(void)
                 return;
         }
 
+        /* re-initialize cputime accounting. */
+        sched_clock_base_cc = get_clock();
+        S390_lowcore.last_update_clock = sched_clock_base_cc;
+        S390_lowcore.last_update_timer = 0x7fffffffffffffffULL;
+        S390_lowcore.user_timer = 0;
+        S390_lowcore.system_timer = 0;
+        asm volatile("SPT 0(%0)" : : "a" (&S390_lowcore.last_update_timer));
+
         /* re-setup boot command line with new ipl vm parms */
         ipl_update_parameters();
         setup_boot_command_line();
diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S
index f43d2ee54464..48215d15762b 100644
--- a/arch/s390/kernel/entry.S
+++ b/arch/s390/kernel/entry.S
@@ -565,10 +565,10 @@ pgm_svcper:
         lh      %r7,0x8a                # get svc number from lowcore
         l       %r9,__LC_THREAD_INFO    # load pointer to thread_info struct
         TRACE_IRQS_OFF
-        l       %r1,__TI_task(%r9)
-        mvc     __THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID
-        mvc     __THREAD_per+__PER_address(4,%r1),__LC_PER_ADDRESS
-        mvc     __THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID
+        l       %r8,__TI_task(%r9)
+        mvc     __THREAD_per+__PER_atmid(2,%r8),__LC_PER_ATMID
+        mvc     __THREAD_per+__PER_address(4,%r8),__LC_PER_ADDRESS
+        mvc     __THREAD_per+__PER_access_id(1,%r8),__LC_PER_ACCESS_ID
         oi      __TI_flags+3(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP
         TRACE_IRQS_ON
         stosm   __SF_EMPTY(%r15),0x03   # reenable interrupts
diff --git a/arch/s390/kernel/entry64.S b/arch/s390/kernel/entry64.S
index a6f7b20df616..9aff1d449b6e 100644
--- a/arch/s390/kernel/entry64.S
+++ b/arch/s390/kernel/entry64.S
@@ -543,10 +543,10 @@ pgm_svcper:
         mvc     __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
         llgh    %r7,__LC_SVC_INT_CODE   # get svc number from lowcore
         lg      %r9,__LC_THREAD_INFO    # load pointer to thread_info struct
-        lg      %r1,__TI_task(%r9)
-        mvc     __THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID
-        mvc     __THREAD_per+__PER_address(8,%r1),__LC_PER_ADDRESS
-        mvc     __THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID
+        lg      %r8,__TI_task(%r9)
+        mvc     __THREAD_per+__PER_atmid(2,%r8),__LC_PER_ATMID
+        mvc     __THREAD_per+__PER_address(8,%r8),__LC_PER_ADDRESS
+        mvc     __THREAD_per+__PER_access_id(1,%r8),__LC_PER_ACCESS_ID
         oi      __TI_flags+7(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP
         TRACE_IRQS_ON
         stosm   __SF_EMPTY(%r15),0x03   # reenable interrupts
diff --git a/drivers/s390/char/monreader.c b/drivers/s390/char/monreader.c
index 89ece1c235aa..66e21dd23154 100644
--- a/drivers/s390/char/monreader.c
+++ b/drivers/s390/char/monreader.c
@@ -357,6 +357,7 @@ static int mon_close(struct inode *inode, struct file *filp)
         atomic_set(&monpriv->msglim_count, 0);
         monpriv->write_index  = 0;
         monpriv->read_index   = 0;
+        dev_set_drvdata(monreader_device, NULL);
 
         for (i = 0; i < MON_MSGLIM; i++)
                 kfree(monpriv->msg_array[i]);
diff --git a/drivers/s390/char/sclp_quiesce.c b/drivers/s390/char/sclp_quiesce.c
index 84c191c1cd62..05909a7df8b3 100644
--- a/drivers/s390/char/sclp_quiesce.c
+++ b/drivers/s390/char/sclp_quiesce.c
@@ -20,9 +20,12 @@
 
 #include "sclp.h"
 
+static void (*old_machine_restart)(char *);
+static void (*old_machine_halt)(void);
+static void (*old_machine_power_off)(void);
+
 /* Shutdown handler. Signal completion of shutdown by loading special PSW. */
-static void
-do_machine_quiesce(void)
+static void do_machine_quiesce(void)
 {
         psw_t quiesce_psw;
 
@@ -33,23 +36,48 @@ do_machine_quiesce(void)
 }
 
 /* Handler for quiesce event. Start shutdown procedure. */
-static void
-sclp_quiesce_handler(struct evbuf_header *evbuf)
+static void sclp_quiesce_handler(struct evbuf_header *evbuf)
 {
-        _machine_restart = (void *) do_machine_quiesce;
-        _machine_halt = do_machine_quiesce;
-        _machine_power_off = do_machine_quiesce;
+        if (_machine_restart != (void *) do_machine_quiesce) {
+                old_machine_restart = _machine_restart;
+                old_machine_halt = _machine_halt;
+                old_machine_power_off = _machine_power_off;
+                _machine_restart = (void *) do_machine_quiesce;
+                _machine_halt = do_machine_quiesce;
+                _machine_power_off = do_machine_quiesce;
+        }
         ctrl_alt_del();
 }
 
+/* Undo machine restart/halt/power_off modification on resume */
+static void sclp_quiesce_pm_event(struct sclp_register *reg,
+                                  enum sclp_pm_event sclp_pm_event)
+{
+        switch (sclp_pm_event) {
+        case SCLP_PM_EVENT_RESTORE:
+                if (old_machine_restart) {
+                        _machine_restart = old_machine_restart;
+                        _machine_halt = old_machine_halt;
+                        _machine_power_off = old_machine_power_off;
+                        old_machine_restart = NULL;
+                        old_machine_halt = NULL;
+                        old_machine_power_off = NULL;
+                }
+                break;
+        case SCLP_PM_EVENT_FREEZE:
+        case SCLP_PM_EVENT_THAW:
+                break;
+        }
+}
+
 static struct sclp_register sclp_quiesce_event = {
         .receive_mask = EVTYP_SIGQUIESCE_MASK,
-        .receiver_fn = sclp_quiesce_handler
+        .receiver_fn = sclp_quiesce_handler,
+        .pm_event_fn = sclp_quiesce_pm_event
 };
 
 /* Initialize quiesce driver. */
-static int __init
-sclp_quiesce_init(void)
+static int __init sclp_quiesce_init(void)
 {
         return sclp_register(&sclp_quiesce_event);
 }