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  linux-hardening  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:	Sun, 15 Jun 2014 20:56:35 +0200
From:	Sam Ravnborg <>
To:	Peter Hurley <>
Cc:	Aaro Koskinen <>,
	David Miller <>,,,
	Greg Kroah-Hartman <>,
	Seth Bollinger <>,
Subject: Re: Linux 3.15: SPARC serial console regression

Hi Peter.

On Tue, Jun 10, 2014 at 05:20:08PM -0400, Peter Hurley wrote:
> Hi Sam,
> On 06/10/2014 03:24 PM, Sam Ravnborg wrote:
> >>From: Peter Hurley <>
> >>Date: Mon, 9 Jun 2014 19:21:43 -0400
> >>Subject: [PATCH] serial: sunsab: Test for no tx data on tx restart
> >>
> >>Commit 717f3bbab3c7628736ef738fdbf3d9a28578c26c,
> >>'serial_core: Fix conditional start_tx on ring buffer not empty'
> >>exposes an incorrect assumption in sunsab's start_tx method; the
> >>tx ring buffer can, in fact, be empty when restarting tx when
> >>performing flow control.

We have a report that commit 717f3bbab3c7628736ef738fdbf3d9a28578c26c
("serial_core: Fix conditional start_tx on ring buffer not empty")
broke at least one more driver:

    Aaro Koskinen <> reported:
    The same problem is present also on PowerPC G5 Xserve (pmac_zilog driver)

And based on code review a third driver is broken:

    Sam Ravnborg <> reported:
    Can you please take a look at sunzilog.c.
    It looks like the same test is missing in sunzilog_start_tx():

This is a regression so we should either revert the above commit
or review and fix the remaining drivers.

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

Powered by blists - more mailing lists