linux-kernel - [PATCH 12/13] usb-storage: set virt_boundary

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Date:   Wed,  5 Jun 2019 21:08:35 +0200
From:   Christoph Hellwig <hch@....de>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     Sebastian Ott <sebott@...ux.ibm.com>,
        Sagi Grimberg <sagi@...mberg.me>,
        Max Gurtovoy <maxg@...lanox.com>,
        Bart Van Assche <bvanassche@....org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Oliver Neukum <oneukum@...e.com>, linux-block@...r.kernel.org,
        linux-rdma@...r.kernel.org, linux-mmc@...r.kernel.org,
        linux-nvme@...ts.infradead.org, linux-scsi@...r.kernel.org,
        megaraidlinux.pdl@...adcom.com, MPT-FusionLinux.pdl@...adcom.com,
        linux-hyperv@...r.kernel.org, linux-usb@...r.kernel.org,
        usb-storage@...ts.one-eyed-alien.net, linux-kernel@...r.kernel.org
Subject: [PATCH 12/13] usb-storage: set virt_boundary_mask in the scsi host

This ensures all proper DMA layer handling is taken care of by the
SCSI midlayer.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 drivers/usb/storage/scsiglue.c | 10 ----------
 drivers/usb/storage/usb.c      | 10 ++++++++++
 2 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/drivers/usb/storage/scsiglue.c b/drivers/usb/storage/scsiglue.c
index 59190d88fa9f..02c3b66b3f78 100644
--- a/drivers/usb/storage/scsiglue.c
+++ b/drivers/usb/storage/scsiglue.c
@@ -65,7 +65,6 @@ static const char* host_info(struct Scsi_Host *host)
 static int slave_alloc (struct scsi_device *sdev)
 {
 	struct us_data *us = host_to_us(sdev->host);
-	int maxp;
 
 	/*
 	 * Set the INQUIRY transfer length to 36.  We don't use any of
@@ -74,15 +73,6 @@ static int slave_alloc (struct scsi_device *sdev)
 	 */
 	sdev->inquiry_len = 36;
 
-	/*
-	 * USB has unusual scatter-gather requirements: the length of each
-	 * scatterlist element except the last must be divisible by the
-	 * Bulk maxpacket value.  Fortunately this value is always a
-	 * power of 2.  Inform the block layer about this requirement.
-	 */
-	maxp = usb_maxpacket(us->pusb_dev, us->recv_bulk_pipe, 0);
-	blk_queue_virt_boundary(sdev->request_queue, maxp - 1);
-
 	/*
 	 * Some host controllers may have alignment requirements.
 	 * We'll play it safe by requiring 512-byte alignment always.
diff --git a/drivers/usb/storage/usb.c b/drivers/usb/storage/usb.c
index 9a79cd9762f3..b0f23f4f58e3 100644
--- a/drivers/usb/storage/usb.c
+++ b/drivers/usb/storage/usb.c
@@ -1050,6 +1050,16 @@ int usb_stor_probe2(struct us_data *us)
 	usb_autopm_get_interface_no_resume(us->pusb_intf);
 	snprintf(us->scsi_name, sizeof(us->scsi_name), "usb-storage %s",
 					dev_name(&us->pusb_intf->dev));
+
+	/*
+	 * USB has unusual scatter-gather requirements: the length of each
+	 * scatterlist element except the last must be divisible by the
+	 * Bulk maxpacket value.  Fortunately this value is always a
+	 * power of 2.  Inform the block layer about this requirement.
+	 */
+	us_to_host(us)->virt_boundary_mask =
+		usb_maxpacket(us->pusb_dev, us->recv_bulk_pipe, 0) - 1;
+
 	result = scsi_add_host(us_to_host(us), dev);
 	if (result) {
 		dev_warn(dev,
-- 
2.20.1