usb-storage: use hcd_uses_dma to check for DMA capabilities (bf89015a) · Commits · 戴 / test

The dma_mask on its own doesn't mean much. Instead check for the actual flag. Signed-off-by:

drivers/usb/storage/scsiglue.c

+3 −3

Original line number	Diff line number	Diff line
		@@ -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);

		/*