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authorPete Zaitcev <zaitcev@redhat.com>2007-07-10 20:09:58 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2007-07-19 17:46:03 -0700
commit10e485221edd2799dc495e4cde98fe74aeb292b1 (patch)
tree44998327db21c9b1afa1166358e697244ad7a96c /drivers/usb/class
parent9454c46a89c13fe82a28c91706b86f612fd19462 (diff)
downloadop-kernel-dev-10e485221edd2799dc495e4cde98fe74aeb292b1.zip
op-kernel-dev-10e485221edd2799dc495e4cde98fe74aeb292b1.tar.gz
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 <zaitcev@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/class')
-rw-r--r--drivers/usb/class/usblp.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/usb/class/usblp.c b/drivers/usb/class/usblp.c
index 9a14789..80ec103 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;
}
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