diff options
Diffstat (limited to 'drivers/usb/storage/usb.c')
| -rw-r--r-- | drivers/usb/storage/usb.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/usb/storage/usb.c b/drivers/usb/storage/usb.c index d1ad6a2509ab..a49a31639f6f 100644 --- a/drivers/usb/storage/usb.c +++ b/drivers/usb/storage/usb.c @@ -47,6 +47,7 @@ #include <scsi/scsi_device.h> #include "usb.h" +#include <linux/usb/hcd.h> #include "scsiglue.h" #include "transport.h" #include "protocol.h" @@ -961,6 +962,15 @@ int usb_stor_probe1(struct us_data **pus, if (result) goto BadDevice; + /* + * Some USB host controllers can't do DMA; they have to use PIO. + * For such controllers we need to make sure the block layer sets + * up bounce buffers in addressable memory. + */ + if (!hcd_uses_dma(bus_to_hcd(us->pusb_dev->bus)) || + bus_to_hcd(us->pusb_dev->bus)->localmem_pool) + host->no_highmem = true; + /* Get the unusual_devs entries and the descriptors */ result = get_device_info(us, id, unusual_dev); if (result) |