diff options
| -rw-r--r-- | drivers/pci/intel-iommu.c | 14 | ||||
| -rw-r--r-- | fs/namespace.c | 6 |
2 files changed, 17 insertions, 3 deletions
diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c index f4b7c79023ff..fa9e41626bfc 100644 --- a/drivers/pci/intel-iommu.c +++ b/drivers/pci/intel-iommu.c @@ -61,6 +61,8 @@ /* global iommu list, set NULL for ignored DMAR units */ static struct intel_iommu **g_iommus; +static int rwbf_quirk = 0; + /* * 0: Present * 1-11: Reserved @@ -785,7 +787,7 @@ static void iommu_flush_write_buffer(struct intel_iommu *iommu) u32 val; unsigned long flag; - if (!cap_rwbf(iommu->cap)) + if (!rwbf_quirk && !cap_rwbf(iommu->cap)) return; val = iommu->gcmd | DMA_GCMD_WBF; @@ -3137,3 +3139,13 @@ static struct iommu_ops intel_iommu_ops = { .unmap = intel_iommu_unmap_range, .iova_to_phys = intel_iommu_iova_to_phys, }; + +static void __devinit quirk_iommu_rwbf(struct pci_dev *dev) +{ + /* Mobile 4 Series Chipset neglects to set RWBF capability, + but needs it */ + printk(KERN_INFO "DMAR: Forcing write-buffer flush capability\n"); + rwbf_quirk = 1; +} + +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2a40, quirk_iommu_rwbf); diff --git a/fs/namespace.c b/fs/namespace.c index 228d8c4bfd18..06f8e63f6cb1 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -614,9 +614,11 @@ static inline void __mntput(struct vfsmount *mnt) */ for_each_possible_cpu(cpu) { struct mnt_writer *cpu_writer = &per_cpu(mnt_writers, cpu); - if (cpu_writer->mnt != mnt) - continue; spin_lock(&cpu_writer->lock); + if (cpu_writer->mnt != mnt) { + spin_unlock(&cpu_writer->lock); + continue; + } atomic_add(cpu_writer->count, &mnt->__mnt_writers); cpu_writer->count = 0; /* |
