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Subject[PATCH 12/13] usb-storage: set virt_boundary_mask in the scsi host
Date
This ensures all proper DMA layer handling is taken care of by the
SCSI midlayer.

Signed-off-by: Christoph Hellwig <hch@lst.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
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