linux-kernel - [PATCH AUTOSEL for 4.9 02/52] nvme: check hw sectors before setting chunk sectors

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Message-ID: <20180203180303.8490-2-alexander.levin@microsoft.com>
Date:   Sat, 3 Feb 2018 18:03:33 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     Keith Busch <keith.busch@...el.com>,
        Christoph Hellwig <hch@....de>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.9 02/52] nvme: check hw sectors before setting
 chunk sectors

From: Keith Busch <keith.busch@...el.com>

[ Upstream commit 249159c5f15812140fa216f9997d799ac0023a1f ]

Some devices with IDs matching the "stripe" quirk don't actually have
this quirk, and don't have an MDTS value. When MDTS is not set, the
driver sets the max sectors to UINT_MAX, which is not a power of 2,
hitting a BUG_ON from blk_queue_chunk_sectors. This patch skips setting
chunk sectors for such devices.

Signed-off-by: Keith Busch <keith.busch@...el.com>
Reviewed-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Christoph Hellwig <hch@....de>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 drivers/nvme/host/core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 719ee5fb2626..ad9d82eb2aed 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1204,7 +1204,8 @@ static void nvme_set_queue_limits(struct nvme_ctrl *ctrl,
 		blk_queue_max_hw_sectors(q, ctrl->max_hw_sectors);
 		blk_queue_max_segments(q, min_t(u32, max_segments, USHRT_MAX));
 	}
-	if (ctrl->quirks & NVME_QUIRK_STRIPE_SIZE)
+	if ((ctrl->quirks & NVME_QUIRK_STRIPE_SIZE) &&
+	    is_power_of_2(ctrl->max_hw_sectors))
 		blk_queue_chunk_sectors(q, ctrl->max_hw_sectors);
 	blk_queue_virt_boundary(q, ctrl->page_size - 1);
 	if (ctrl->vwc & NVME_CTRL_VWC_PRESENT)
-- 
2.11.0