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path: root/drivers/nvdimm/pmem.c
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Diffstat (limited to 'drivers/nvdimm/pmem.c')
-rw-r--r--drivers/nvdimm/pmem.c28
1 files changed, 23 insertions, 5 deletions
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index 571a6c7ee2fc..42b3a8217073 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -66,13 +66,32 @@ static void pmem_clear_poison(struct pmem_device *pmem, phys_addr_t offset,
invalidate_pmem(pmem->virt_addr + offset, len);
}
+static void write_pmem(void *pmem_addr, struct page *page,
+ unsigned int off, unsigned int len)
+{
+ void *mem = kmap_atomic(page);
+
+ memcpy_to_pmem(pmem_addr, mem + off, len);
+ kunmap_atomic(mem);
+}
+
+static int read_pmem(struct page *page, unsigned int off,
+ void *pmem_addr, unsigned int len)
+{
+ int rc;
+ void *mem = kmap_atomic(page);
+
+ rc = memcpy_from_pmem(mem + off, pmem_addr, len);
+ kunmap_atomic(mem);
+ return rc;
+}
+
static int pmem_do_bvec(struct pmem_device *pmem, struct page *page,
unsigned int len, unsigned int off, bool is_write,
sector_t sector)
{
int rc = 0;
bool bad_pmem = false;
- void *mem = kmap_atomic(page);
phys_addr_t pmem_off = sector * 512 + pmem->data_offset;
void *pmem_addr = pmem->virt_addr + pmem_off;
@@ -83,7 +102,7 @@ static int pmem_do_bvec(struct pmem_device *pmem, struct page *page,
if (unlikely(bad_pmem))
rc = -EIO;
else {
- rc = memcpy_from_pmem(mem + off, pmem_addr, len);
+ rc = read_pmem(page, off, pmem_addr, len);
flush_dcache_page(page);
}
} else {
@@ -102,14 +121,13 @@ static int pmem_do_bvec(struct pmem_device *pmem, struct page *page,
* after clear poison.
*/
flush_dcache_page(page);
- memcpy_to_pmem(pmem_addr, mem + off, len);
+ write_pmem(pmem_addr, page, off, len);
if (unlikely(bad_pmem)) {
pmem_clear_poison(pmem, pmem_off, len);
- memcpy_to_pmem(pmem_addr, mem + off, len);
+ write_pmem(pmem_addr, page, off, len);
}
}
- kunmap_atomic(mem);
return rc;
}