From: Markus Rechberger <mrechberger@xxxxxxxxx> The current limit only allows isochronous transfers up to 32kbyte/urb, updating this to 192 kbyte/urb improves the reliability of the transfer. USB 2.0 transfer is possible with 32kbyte but increases the chance of corrupted/incomplete data when the system is performing some other tasks in the background. http://www.spinics.net/lists/linux-usb/msg19955.html Signed-off-by: Markus Rechberger <mrechberger@xxxxxxxxx> Cc: Oliver Neukum <oliver@xxxxxxxxxx> Cc: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx> --- drivers/usb/core/devio.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletions(-) diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c index a1add77..71514be 100644 --- a/drivers/usb/core/devio.c +++ b/drivers/usb/core/devio.c @@ -1091,7 +1091,8 @@ static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb, } totlen += isopkt[u].length; } - if (totlen > 32768) { + /* 3072 * 64 microframes */ + if (totlen > 196608) { kfree(isopkt); return -EINVAL; } -- 1.6.4.2 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
