From: Huaisheng Ye <ye...@lenovo.com>
Some functions within fs/dax don't need to get gfn from direct_access.
Assigning NULL to gfn of dax_direct_access is more intuitive and simple
than offering a useless local variable.
So direct_access needs to check validity of the pointer pfn For NULL
assignment. If pfn equals to NULL, it doesn't need to calculate its
value.
Signed-off-by: Huaisheng Ye <ye...@lenovo.com>
---
drivers/s390/block/dcssblk.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c
index 0a312e4..5cdfa02 100644
--- a/drivers/s390/block/dcssblk.c
+++ b/drivers/s390/block/dcssblk.c
@@ -916,7 +916,8 @@ static DEVICE_ATTR(save, S_IWUSR | S_IRUSR,
dcssblk_save_show,
dev_sz = dev_info->end - dev_info->start + 1;
*kaddr = (void *) dev_info->start + offset;
- *pfn = __pfn_to_pfn_t(PFN_DOWN(dev_info->start + offset),
+ if (pfn)
+ *pfn = __pfn_to_pfn_t(PFN_DOWN(dev_info->start + offset),
PFN_DEV|PFN_SPECIAL);
return (dev_sz - offset) / PAGE_SIZE;
--
1.8.3.1
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