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USB: increase usbdevfs max isoc buffer size 

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@gmail.com>
Cc: Oliver Neukum <oliver@neukum.org>
Cc: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Markus Rechberger 2009-08-09 21:23:34 +02:00 committed by Greg Kroah-Hartman
parent 7949f4e164
commit 5971897f30
1 changed files with 2 additions and 1 deletions
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3
drivers/usb/core/devio.c
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@ -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;
}