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| author | David Vrabel <david.vrabel@csr.com> | 2009-08-24 14:44:30 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-12-11 11:55:14 -0800 |
| commit | 4c1bd3d7a7d114dabd58f62f386ac4bfd268be1f (patch) | |
| tree | 1c8d7d6df693c71ac0b3dcc4124498d91c939f2d /drivers/usb/storage | |
| parent | 09ce497e79a930ac4912d6bc295baab82b39f8ab (diff) | |
| download | linux-4c1bd3d7a7d114dabd58f62f386ac4bfd268be1f.tar.gz | |
USB: make urb scatter-gather support more generic
The WHCI HCD will also support urbs with scatter-gather lists. Add a usb_bus field to indicated how many sg list elements are supported by the HCD. Use this to decide whether to pass the scatter-list to the HCD or not. Make the usb-storage driver use this new field. Signed-off-by: David Vrabel <david.vrabel@csr.com> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: Sarah Sharp <sarah.a.sharp@linux.intel.com> Cc: Matthew Dharm <mdharm-usb@one-eyed-alien.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/storage')
| -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 01e43a13a6bf..1599d86154c4 100644 --- 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)); |