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authorDan Williams <dan.j.williams@intel.com>2015-10-25 05:55:58 +0300
committerDan Williams <dan.j.williams@intel.com>2015-11-12 20:55:23 +0300
commit589e75d15702dc720b363a92f984876704864946 (patch)
tree82d183895174d8e151f84cbf0e4f0d2436301f7d /drivers/nvdimm
parentf7256dc0cdbc68903502997bde619f555a910f50 (diff)
downloadlinux-589e75d15702dc720b363a92f984876704864946.tar.xz
libnvdimm, pmem: fix size trim in pmem_direct_access()
This masking prevents access to the end of the device via dax_do_io(), and is unnecessary as arch_add_memory() would have rejected an unaligned allocation. Cc: <stable@vger.kernel.org> Cc: Ross Zwisler <ross.zwisler@linux.intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/nvdimm')
-rw-r--r--drivers/nvdimm/pmem.c15
1 files changed, 2 insertions, 13 deletions
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index 012e0649f1ac..8ee79893d2f5 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -105,22 +105,11 @@ static long pmem_direct_access(struct block_device *bdev, sector_t sector,
{
struct pmem_device *pmem = bdev->bd_disk->private_data;
resource_size_t offset = sector * 512 + pmem->data_offset;
- resource_size_t size;
-
- if (pmem->data_offset) {
- /*
- * Limit the direct_access() size to what is covered by
- * the memmap
- */
- size = (pmem->size - offset) & ~ND_PFN_MASK;
- } else
- size = pmem->size - offset;
-
- /* FIXME convert DAX to comprehend that this mapping has a lifetime */
+
*kaddr = pmem->virt_addr + offset;
*pfn = (pmem->phys_addr + offset) >> PAGE_SHIFT;
- return size;
+ return pmem->size - offset;
}
static const struct block_device_operations pmem_fops = {