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

Pull s390 fixes from Martin Schwidefsky:
 "Four bug fixes"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  s390/dasd: fix wrongly assigned configuration data
  s390: fix preemption race in disable_sacf_uaccess
  s390/sclp: disable FORTIFY_SOURCE for early sclp code
  s390/pci: handle insufficient resources during dma tlb flush

3 files changed, 23 insertions, 3 deletions

diff --git a/arch/s390/lib/uaccess.c b/arch/s390/lib/uaccess.c
index cae5a1e16cbd..c4f8039a35e8 100644
--- a/arch/s390/lib/uaccess.c
+++ b/arch/s390/lib/uaccess.c
@@ -89,11 +89,11 @@ EXPORT_SYMBOL(enable_sacf_uaccess);
 
 void disable_sacf_uaccess(mm_segment_t old_fs)
 {
+	current->thread.mm_segment = old_fs;
 	if (old_fs == USER_DS && test_facility(27)) {
 		__ctl_load(S390_lowcore.user_asce, 1, 1);
 		clear_cpu_flag(CIF_ASCE_PRIMARY);
 	}
-	current->thread.mm_segment = old_fs;
 }
 EXPORT_SYMBOL(disable_sacf_uaccess);
 
diff --git a/arch/s390/pci/pci_dma.c b/arch/s390/pci/pci_dma.c
index f7aa5a77827e..2d15d84c20ed 100644
--- a/arch/s390/pci/pci_dma.c
+++ b/arch/s390/pci/pci_dma.c
@@ -181,6 +181,9 @@ out_unlock:
 static int __dma_purge_tlb(struct zpci_dev *zdev, dma_addr_t dma_addr,
 			   size_t size, int flags)
 {
+	unsigned long irqflags;
+	int ret;
+
 	/*
 	 * With zdev->tlb_refresh == 0, rpcit is not required to establish new
 	 * translations when previously invalid translation-table entries are
@@ -196,8 +199,22 @@ static int __dma_purge_tlb(struct zpci_dev *zdev, dma_addr_t dma_addr,
 			return 0;
 	}
 
-	return zpci_refresh_trans((u64) zdev->fh << 32, dma_addr,
-				  PAGE_ALIGN(size));
+	ret = zpci_refresh_trans((u64) zdev->fh << 32, dma_addr,
+				 PAGE_ALIGN(size));
+	if (ret == -ENOMEM && !s390_iommu_strict) {
+		/* enable the hypervisor to free some resources */
+		if (zpci_refresh_global(zdev))
+			goto out;
+
+		spin_lock_irqsave(&zdev->iommu_bitmap_lock, irqflags);
+		bitmap_andnot(zdev->iommu_bitmap, zdev->iommu_bitmap,
+			      zdev->lazy_bitmap, zdev->iommu_pages);
+		bitmap_zero(zdev->lazy_bitmap, zdev->iommu_pages);
+		spin_unlock_irqrestore(&zdev->iommu_bitmap_lock, irqflags);
+		ret = 0;
+	}
+out:
+	return ret;
 }
 
 static int dma_update_trans(struct zpci_dev *zdev, unsigned long pa,
diff --git a/arch/s390/pci/pci_insn.c b/arch/s390/pci/pci_insn.c
index 19bcb3b45a70..f069929e8211 100644
--- a/arch/s390/pci/pci_insn.c
+++ b/arch/s390/pci/pci_insn.c
@@ -89,6 +89,9 @@ int zpci_refresh_trans(u64 fn, u64 addr, u64 range)
 	if (cc)
 		zpci_err_insn(cc, status, addr, range);
 
+	if (cc == 1 && (status == 4 || status == 16))
+		return -ENOMEM;
+
 	return (cc) ? -EIO : 0;
 }