linux-kernel - [PATCH 4.12 082/196] libnvdimm: fix the clear-error check in nsio_rw

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Date:   Tue, 25 Jul 2017 12:21:21 -0700
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dave Jiang <dave.jiang@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>
Subject: [PATCH 4.12 082/196] libnvdimm: fix the clear-error check in nsio_rw_bytes

4.12-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Vishal Verma <vishal.l.verma@...el.com>

commit 7e5a21dfe5524a85705d3bc7b540c849cc13e9a1 upstream.

A leftover from the 'bandaid' fix that disabled BTT error clearing in
rw_bytes resulted in an incorrect check. After we converted these checks
over to use the NVDIMM_IO_ATOMIC flag, the ndns->claim check was both
redundant, and incorrect. Remove it.

Fixes: 3ae3d67ba705 ("libnvdimm: add an atomic vs process context flag to rw_bytes")
Cc: Dave Jiang <dave.jiang@...el.com>
Cc: Dan Williams <dan.j.williams@...el.com>
Signed-off-by: Vishal Verma <vishal.l.verma@...el.com>
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/nvdimm/claim.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/nvdimm/claim.c
+++ b/drivers/nvdimm/claim.c
@@ -260,8 +260,7 @@ static int nsio_rw_bytes(struct nd_names
 		 * work around this collision.
 		 */
 		if (IS_ALIGNED(offset, 512) && IS_ALIGNED(size, 512)
-				&& !(flags & NVDIMM_IO_ATOMIC)
-				&& !ndns->claim) {
+				&& !(flags & NVDIMM_IO_ATOMIC)) {
 			long cleared;
 
 			cleared = nvdimm_clear_poison(&ndns->dev,