linux-kernel - [RFC PATCH 10/15] drivers/dax: Expand lock scope to cover the use of addresses

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Message-Id: <20200714070220.3500839-11-ira.weiny@intel.com>
Date:   Tue, 14 Jul 2020 00:02:15 -0700
From:   ira.weiny@...el.com
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Ira Weiny <ira.weiny@...el.com>,
        Dan Williams <dan.j.williams@...el.com>, x86@...nel.org,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Fenghua Yu <fenghua.yu@...el.com>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-nvdimm@...ts.01.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kselftest@...r.kernel.org
Subject: [RFC PATCH 10/15] drivers/dax: Expand lock scope to cover the use of addresses

From: Ira Weiny <ira.weiny@...el.com>

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.

While not technically necessary for this series, this corrects the
locking by ensuring that the use of kaddr and end_kaddr are covered by
the dax read lock/unlock.

Change the lock scope to cover the kaddr and end_kaddr use.

Reviewed-by: Dan Williams <dan.j.williams@...el.com>
Signed-off-by: Ira Weiny <ira.weiny@...el.com>
---
 drivers/dax/super.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/dax/super.c b/drivers/dax/super.c
index 8e32345be0f7..021739768093 100644
--- a/drivers/dax/super.c
+++ b/drivers/dax/super.c
@@ -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_debug("%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_debug("%s: error: dax support not enabled\n",
-- 
2.25.1