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Subject[PATCH 3/6] usb-storage: use hcd_uses_dma to check for DMA capabilities
Date
The dma_mask on its own doesn't mean much.  Instead check for the actual
flag.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
drivers/usb/storage/scsiglue.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/storage/scsiglue.c b/drivers/usb/storage/scsiglue.c
index 05b80211290d..7e0bc640c237 100644
--- a/drivers/usb/storage/scsiglue.c
+++ b/drivers/usb/storage/scsiglue.c
@@ -40,6 +40,7 @@
#include <scsi/scsi_eh.h>

#include "usb.h"
+#include <linux/usb/hcd.h>
#include "scsiglue.h"
#include "debug.h"
#include "transport.h"
@@ -141,11 +142,10 @@ static int slave_configure(struct scsi_device *sdev)

/*
* Some USB host controllers can't do DMA; they have to use PIO.
- * They indicate this by setting their dma_mask to NULL. For
- * such controllers we need to make sure the block layer sets
+ * For such controllers we need to make sure the block layer sets
* up bounce buffers in addressable memory.
*/
- if (!us->pusb_dev->bus->controller->dma_mask)
+ if (!hcd_uses_dma(bus_to_hcd(us->pusb_dev->bus)))
blk_queue_bounce_limit(sdev->request_queue, BLK_BOUNCE_HIGH);

/*
--
2.20.1
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