From 10e485221edd2799dc495e4cde98fe74aeb292b1 Mon Sep 17 00:00:00 2001 From: Pete Zaitcev Date: Tue, 10 Jul 2007 20:09:58 -0700 Subject: [PATCH] USB: usblp: "Big cleanup" breaks O_NONBLOCK I found the first regresson in the rewritten ("all dynamic" and "no races") driver. If application uses O_NONBLOCK, I return -EAGAIN despite the URB being submitted successfuly. This causes the application to resubmit the same data erroneously. The fix is to pretend that the transfer has succeeded even if URB was merely queued. It is the same behaviour as with the old version. Signed-off-by: Pete Zaitcev Signed-off-by: Greg Kroah-Hartman --- drivers/usb/class/usblp.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/usb/class/usblp.c b/drivers/usb/class/usblp.c index 9a1478972bf5..80ec1039d670 100644 --- a/drivers/usb/class/usblp.c +++ b/drivers/usb/class/usblp.c @@ -741,10 +741,11 @@ static ssize_t usblp_write(struct file *file, const char __user *buffer, size_t */ rv = usblp_wwait(usblp, !!(file->f_flags&O_NONBLOCK)); if (rv < 0) { - /* - * If interrupted, we simply leave the URB to dangle, - * so the ->release will call usb_kill_urb(). - */ + if (rv == -EAGAIN) { + /* Presume that it's going to complete well. */ + writecount += transfer_length; + } + /* Leave URB dangling, to be cleaned on close. */ goto collect_error; }