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md/dm-writecache: Don't request pointer dummy_addr when not required

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Function persistent_memory_claim doesn't need to get local pointer
dummy_addr from direct_access. Using NULL instead of having to pass
in a useless local pointer that caller then just throw away.

Suggested-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Huaisheng Ye <yehs1@lenovo.com>
Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Acked-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
This commit is contained in:
Huaisheng Ye 2018-07-30 15:15:47 +08:00 committed by Dave Jiang
parent e0b401e3fe
commit f742267ae9
1 changed files with 1 additions and 2 deletions
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3
drivers/md/dm-writecache.c
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@ -267,9 +267,8 @@ static int persistent_memory_claim(struct dm_writecache *wc)
i = 0;
do {
long daa;
void *dummy_addr;
daa = dax_direct_access(wc->ssd_dev->dax_dev, i, p - i,
&dummy_addr, &pfn);
NULL, &pfn);
if (daa <= 0) {
r = daa ? daa : -EINVAL;
goto err3;