lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:	Fri, 14 Nov 2014 05:14:36 +0000
From:	Hayes Wang <hayeswang@...ltek.com>
To:	David Miller <davem@...emloft.net>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	nic_swsd <nic_swsd@...ltek.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
Subject: RE: [PATCH net-next 2/2] r8152: adjust rtl_start_rx

David Miller [mailto:davem@...emloft.net] 
> Sent: Friday, November 14, 2014 5:23 AM
[...]
> What if even the first r8152_submit_rx() fails?  What ever will cause
> any of these retries to trigger at all?

According to the patch #1 "adjust r8152_submit_rx", the
r8152_submit_rx() would add the rx to the list and schedule
the tasklet, when the error occurs. Each time the tasklet is
called, the rx_bottom() would deal with all the rx in the
list. If the actual_length isn't vaild, the rx buffer would be
submitted directly. By this way, the retries would be done.
That is, the retries would be triggered when the tasklet
is called. Therefore, any tx, rx, and tasklet scheduling
would result in the retries.

> Second, why does your patch increment 'i' with 'i++;' in the error
> break path?  You should mark the first failed entry as unallocated
> with actual_length == 0 and place it on the rx_done queue.

Because the r8152_submit_rx() would add the failed rx to
the list, I only have to deal with the remaining ones. That
is why I increase the "i", otherwise the failed one would
be added twice.

I remember the usb_submit_urb() would set actual_length
to 0, so I skip the step. I would check it again.
 
Best Regards,
Hayes
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Powered by blists - more mailing lists