USB: make urb scatter-gather support more generic

[safe/jmp/linux-2.6] / drivers / usb / storage / usb.c

diff --git a/drivers/usb/storage/usb.c b/drivers/usb/storage/usb.c
index 01e43a1..1599d86 100644 (file)
--- a/drivers/usb/storage/usb.c
+++ b/drivers/usb/storage/usb.c
@@ -843,6 +843,15 @@ static int usb_stor_scan_thread(void * __us)
        complete_and_exit(&us->scanning_done, 0);
 }
 
+static unsigned int usb_stor_sg_tablesize(struct usb_interface *intf)
+{
+       struct usb_device *usb_dev = interface_to_usbdev(intf);
+
+       if (usb_dev->bus->sg_tablesize) {
+               return usb_dev->bus->sg_tablesize;
+       }
+       return SG_ALL;
+}
 
 /* First part of general USB mass-storage probing */
 int usb_stor_probe1(struct us_data **pus,
@@ -871,6 +880,7 @@ int usb_stor_probe1(struct us_data **pus,
         * Allow 16-byte CDBs and thus > 2TB
         */
        host->max_cmd_len = 16;
+       host->sg_tablesize = usb_stor_sg_tablesize(intf);
        *pus = us = host_to_us(host);
        memset(us, 0, sizeof(struct us_data));
        mutex_init(&(us->dev_mutex));