Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

Pull s390 fixes from Martin Schwidefsky:
 "Recent bug fixes, one of them touches a common code file.

  It adds two #ifndef/#endif pairs to asm-generic/io.h to be able to
  override xlate_dev_kmem_ptr and xlate_dev_mem_ptr."

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  s390/pgtable: Fix gmap notifier address
  s390/dasd: fix handling of gone paths
  s390/pgtable: Fix check for pgste/storage key handling
  arch: s390: appldata: using strncpy() and strnlen() instead of sprintf()
  s390/smp: lost IPIs on cpu hotplug
  kernel: Fix s390 absolute memory access for /dev/mem
  s390/dma: do not call debug_dma after free

8 files changed, 44 insertions, 26 deletions

diff --git a/arch/s390/appldata/appldata_base.c b/arch/s390/appldata/appldata_base.c
index bae0f402bf2ab..87a22092b68f8 100644
--- a/arch/s390/appldata/appldata_base.c
+++ b/arch/s390/appldata/appldata_base.c
@@ -212,7 +212,9 @@ appldata_timer_handler(ctl_table *ctl, int write,
 		return 0;
 	}
 	if (!write) {
-		len = sprintf(buf, appldata_timer_active ? "1\n" : "0\n");
+		strncpy(buf, appldata_timer_active ? "1\n" : "0\n",
+			ARRAY_SIZE(buf));
+		len = strnlen(buf, ARRAY_SIZE(buf));
 		if (len > *lenp)
 			len = *lenp;
 		if (copy_to_user(buffer, buf, len))
@@ -317,7 +319,8 @@ appldata_generic_handler(ctl_table *ctl, int write,
 		return 0;
 	}
 	if (!write) {
-		len = sprintf(buf, ops->active ? "1\n" : "0\n");
+		strncpy(buf, ops->active ? "1\n" : "0\n", ARRAY_SIZE(buf));
+		len = strnlen(buf, ARRAY_SIZE(buf));
 		if (len > *lenp)
 			len = *lenp;
 		if (copy_to_user(buffer, buf, len)) {
diff --git a/arch/s390/include/asm/dma-mapping.h b/arch/s390/include/asm/dma-mapping.h
index 9411db653baca..886ac7d4937a8 100644
--- a/arch/s390/include/asm/dma-mapping.h
+++ b/arch/s390/include/asm/dma-mapping.h
@@ -71,8 +71,8 @@ static inline void dma_free_coherent(struct device *dev, size_t size,
 {
 	struct dma_map_ops *dma_ops = get_dma_ops(dev);
 
-	dma_ops->free(dev, size, cpu_addr, dma_handle, NULL);
 	debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
+	dma_ops->free(dev, size, cpu_addr, dma_handle, NULL);
 }
 
 #endif /* _ASM_S390_DMA_MAPPING_H */
diff --git a/arch/s390/include/asm/io.h b/arch/s390/include/asm/io.h
index 379d96e2105ea..fd9be010f9b26 100644
--- a/arch/s390/include/asm/io.h
+++ b/arch/s390/include/asm/io.h
@@ -36,6 +36,7 @@ static inline void * phys_to_virt(unsigned long address)
 }
 
 void *xlate_dev_mem_ptr(unsigned long phys);
+#define xlate_dev_mem_ptr xlate_dev_mem_ptr
 void unxlate_dev_mem_ptr(unsigned long phys, void *addr);
 
 /*
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index 0f0de30e3e3fc..ac01463038f1e 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -646,7 +646,7 @@ static inline pgste_t pgste_update_all(pte_t *ptep, pgste_t pgste)
 	unsigned long address, bits;
 	unsigned char skey;
 
-	if (!pte_present(*ptep))
+	if (pte_val(*ptep) & _PAGE_INVALID)
 		return pgste;
 	address = pte_val(*ptep) & PAGE_MASK;
 	skey = page_get_storage_key(address);
@@ -680,7 +680,7 @@ static inline pgste_t pgste_update_young(pte_t *ptep, pgste_t pgste)
 #ifdef CONFIG_PGSTE
 	int young;
 
-	if (!pte_present(*ptep))
+	if (pte_val(*ptep) & _PAGE_INVALID)
 		return pgste;
 	/* Get referenced bit from storage key */
 	young = page_reset_referenced(pte_val(*ptep) & PAGE_MASK);
@@ -706,7 +706,7 @@ static inline void pgste_set_key(pte_t *ptep, pgste_t pgste, pte_t entry)
 	unsigned long address;
 	unsigned long okey, nkey;
 
-	if (!pte_present(entry))
+	if (pte_val(entry) & _PAGE_INVALID)
 		return;
 	address = pte_val(entry) & PAGE_MASK;
 	okey = nkey = page_get_storage_key(address);
@@ -1098,6 +1098,9 @@ static inline pte_t ptep_modify_prot_start(struct mm_struct *mm,
 	pte = *ptep;
 	if (!mm_exclusive(mm))
 		__ptep_ipte(address, ptep);
+
+	if (mm_has_pgste(mm))
+		pgste = pgste_update_all(&pte, pgste);
 	return pte;
 }
 
@@ -1105,9 +1108,13 @@ static inline void ptep_modify_prot_commit(struct mm_struct *mm,
 					   unsigned long address,
 					   pte_t *ptep, pte_t pte)
 {
+	pgste_t pgste;
+
 	if (mm_has_pgste(mm)) {
+		pgste = *(pgste_t *)(ptep + PTRS_PER_PTE);
+		pgste_set_key(ptep, pgste, pte);
 		pgste_set_pte(ptep, pte);
-		pgste_set_unlock(ptep, *(pgste_t *)(ptep + PTRS_PER_PTE));
+		pgste_set_unlock(ptep, pgste);
 	} else
 		*ptep = pte;
 }
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index 05674b6690019..4f977d0d25c2d 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -428,34 +428,27 @@ void smp_stop_cpu(void)
  * This is the main routine where commands issued by other
  * cpus are handled.
  */
-static void do_ext_call_interrupt(struct ext_code ext_code,
-				  unsigned int param32, unsigned long param64)
+static void smp_handle_ext_call(void)
 {
 	unsigned long bits;
-	int cpu;
-
-	cpu = smp_processor_id();
-	if (ext_code.code == 0x1202)
-		inc_irq_stat(IRQEXT_EXC);
-	else
-		inc_irq_stat(IRQEXT_EMS);
-	/*
-	 * handle bit signal external calls
-	 */
-	bits = xchg(&pcpu_devices[cpu].ec_mask, 0);
 
+	/* handle bit signal external calls */
+	bits = xchg(&pcpu_devices[smp_processor_id()].ec_mask, 0);
 	if (test_bit(ec_stop_cpu, &bits))
 		smp_stop_cpu();
-
 	if (test_bit(ec_schedule, &bits))
 		scheduler_ipi();
-
 	if (test_bit(ec_call_function, &bits))
 		generic_smp_call_function_interrupt();
-
 	if (test_bit(ec_call_function_single, &bits))
 		generic_smp_call_function_single_interrupt();
+}
 
+static void do_ext_call_interrupt(struct ext_code ext_code,
+				  unsigned int param32, unsigned long param64)
+{
+	inc_irq_stat(ext_code.code == 0x1202 ? IRQEXT_EXC : IRQEXT_EMS);
+	smp_handle_ext_call();
 }
 
 void arch_send_call_function_ipi_mask(const struct cpumask *mask)
@@ -760,6 +753,8 @@ int __cpu_disable(void)
 {
 	unsigned long cregs[16];
 
+	/* Handle possible pending IPIs */
+	smp_handle_ext_call();
 	set_cpu_online(smp_processor_id(), false);
 	/* Disable pseudo page faults on this cpu. */
 	pfault_fini();
diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c
index 18dc417aaf79d..a938b548f07e2 100644
--- a/arch/s390/mm/pgtable.c
+++ b/arch/s390/mm/pgtable.c
@@ -492,7 +492,7 @@ static int gmap_connect_pgtable(unsigned long address, unsigned long segment,
 	mp = (struct gmap_pgtable *) page->index;
 	rmap->gmap = gmap;
 	rmap->entry = segment_ptr;
-	rmap->vmaddr = address;
+	rmap->vmaddr = address & PMD_MASK;
 	spin_lock(&mm->page_table_lock);
 	if (*segment_ptr == segment) {
 		list_add(&rmap->list, &mp->mapper);
diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index 4361d9772c42a..d72a9216ee2e9 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -3440,8 +3440,16 @@ void dasd_generic_path_event(struct ccw_device *cdev, int *path_event)
 			device->path_data.opm &= ~eventlpm;
 			device->path_data.ppm &= ~eventlpm;
 			device->path_data.npm &= ~eventlpm;
-			if (oldopm && !device->path_data.opm)
-				dasd_generic_last_path_gone(device);
+			if (oldopm && !device->path_data.opm) {
+				dev_warn(&device->cdev->dev,
+					 "No verified channel paths remain "
+					 "for the device\n");
+				DBF_DEV_EVENT(DBF_WARNING, device,
+					      "%s", "last verified path gone");
+				dasd_eer_write(device, NULL, DASD_EER_NOPATH);
+				dasd_device_set_stop_bits(device,
+							  DASD_STOPPED_DC_WAIT);
+			}
 		}
 		if (path_event[chp] & PE_PATH_AVAILABLE) {
 			device->path_data.opm &= ~eventlpm;
diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h
index ac9da00e9f2c6..d5afe96adba6c 100644
--- a/include/asm-generic/io.h
+++ b/include/asm-generic/io.h
@@ -343,8 +343,12 @@ extern void ioport_unmap(void __iomem *p);
 #endif /* CONFIG_GENERIC_IOMAP */
 #endif /* CONFIG_HAS_IOPORT */
 
+#ifndef xlate_dev_kmem_ptr
 #define xlate_dev_kmem_ptr(p)	p
+#endif
+#ifndef xlate_dev_mem_ptr
 #define xlate_dev_mem_ptr(p)	__va(p)
+#endif
 
 #ifdef CONFIG_VIRT_TO_BUS
 #ifndef virt_to_bus