linux-kernel - [PATCH 4.9 05/56] nvme: check hw sectors before setting chunk sectors

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Message-Id: <20180302084449.910446680@linuxfoundation.org>
Date:   Fri,  2 Mar 2018 09:50:51 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Keith Busch <keith.busch@...el.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Christoph Hellwig <hch@....de>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.9 05/56] nvme: check hw sectors before setting chunk sectors

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

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

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/nvme/host/core.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1204,7 +1204,8 @@ static void nvme_set_queue_limits(struct
 		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)