diff options
Diffstat (limited to 'drivers/parisc/sba_iommu.c')
| -rw-r--r-- | drivers/parisc/sba_iommu.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/parisc/sba_iommu.c b/drivers/parisc/sba_iommu.c index 33385e574433..4086f79d58d5 100644 --- a/drivers/parisc/sba_iommu.c +++ b/drivers/parisc/sba_iommu.c @@ -93,6 +93,8 @@ #define DEFAULT_DMA_HINT_REG 0 +#define SBA_MAPPING_ERROR (~(dma_addr_t)0) + struct sba_device *sba_list; EXPORT_SYMBOL_GPL(sba_list); @@ -691,6 +693,8 @@ static int sba_dma_supported( struct device *dev, u64 mask) return 0; ioc = GET_IOC(dev); + if (!ioc) + return 0; /* * check if mask is >= than the current max IO Virt Address @@ -722,6 +726,8 @@ sba_map_single(struct device *dev, void *addr, size_t size, int pide; ioc = GET_IOC(dev); + if (!ioc) + return SBA_MAPPING_ERROR; /* save offset bits */ offset = ((dma_addr_t) (long) addr) & ~IOVP_MASK; @@ -813,6 +819,10 @@ sba_unmap_page(struct device *dev, dma_addr_t iova, size_t size, DBG_RUN("%s() iovp 0x%lx/%x\n", __func__, (long) iova, size); ioc = GET_IOC(dev); + if (!ioc) { + WARN_ON(!ioc); + return; + } offset = iova & ~IOVP_MASK; iova ^= offset; /* clear offset bits */ size += offset; @@ -952,6 +962,8 @@ sba_map_sg(struct device *dev, struct scatterlist *sglist, int nents, DBG_RUN_SG("%s() START %d entries\n", __func__, nents); ioc = GET_IOC(dev); + if (!ioc) + return 0; /* Fast path single entry scatterlists. */ if (nents == 1) { @@ -1037,6 +1049,10 @@ sba_unmap_sg(struct device *dev, struct scatterlist *sglist, int nents, __func__, nents, sg_virt(sglist), sglist->length); ioc = GET_IOC(dev); + if (!ioc) { + WARN_ON(!ioc); + return; + } #ifdef SBA_COLLECT_STATS ioc->usg_calls++; @@ -1069,6 +1085,11 @@ sba_unmap_sg(struct device *dev, struct scatterlist *sglist, int nents, } +static int sba_mapping_error(struct device *dev, dma_addr_t dma_addr) +{ + return dma_addr == SBA_MAPPING_ERROR; +} + static const struct dma_map_ops sba_ops = { .dma_supported = sba_dma_supported, .alloc = sba_alloc, @@ -1077,6 +1098,7 @@ static const struct dma_map_ops sba_ops = { .unmap_page = sba_unmap_page, .map_sg = sba_map_sg, .unmap_sg = sba_unmap_sg, + .mapping_error = sba_mapping_error, }; |