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drivers/dax: Expand lock scope to cover the use of addresses 

The addition of PKS protection to dax read lock/unlock will require that
the address returned by dax_direct_access() be protected by this lock.

Correct the locking by ensuring that the use of kaddr and end_kaddr
are covered by the dax read lock/unlock.

Link: https://lore.kernel.org/r/20200717072056.73134-12-ira.weiny@intel.com
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
This commit is contained in:
Ira Weiny 2020-07-17 00:20:50 -07:00 committed by Vishal Verma
parent c7fe193f18
commit eedfd73d40
1 changed files with 2 additions and 1 deletions
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3
drivers/dax/super.c
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@ -103,11 +103,11 @@ bool __generic_fsdax_supported(struct dax_device *dax_dev,
id = dax_read_lock();
len = dax_direct_access(dax_dev, pgoff, 1, &kaddr, &pfn);
len2 = dax_direct_access(dax_dev, pgoff_end, 1, &end_kaddr, &end_pfn);
dax_read_unlock(id);
if (len < 1 || len2 < 1) {
pr_info("%s: error: dax access failed (%ld)\n",
bdevname(bdev, buf), len < 1 ? len : len2);
dax_read_unlock(id);
return false;
}
@ -137,6 +137,7 @@ bool __generic_fsdax_supported(struct dax_device *dax_dev,
put_dev_pagemap(end_pgmap);
}
dax_read_unlock(id);
if (!dax_enabled) {
pr_info("%s: error: dax support not enabled\n",