Date: Mon, 5 Aug 2013 10:20:12 -0700 From: Adrian Chadd <adrian@freebsd.org> To: Navdeep Parhar <np@freebsd.org> Cc: Bryan Venteicher <bryanv@daemoninthecloset.org>, Giuseppe Lettieri <g.lettieri@iet.unipi.it>, Luigi Rizzo <rizzo@iet.unipi.it>, current@freebsd.org, net@freebsd.org Subject: Re: [net] protecting interfaces from races between control and data ? Message-ID: <CAJ-Vmomd9bD9cXJtOWnuL_yuM%2BF%2Bt6zaaEgq2PxiT_wxQi%2Bejg@mail.gmail.com> In-Reply-To: <CAJ-Vmo=Q9AqdBJ0%2B4AiX4%2BWreYuZx6VGGYw=MZ4XhMB1P2yMww@mail.gmail.com> References: <20130805082307.GA35162@onelab2.iet.unipi.it> <2034715395.855.1375714772487.JavaMail.root@daemoninthecloset.org> <CAJ-VmokT6YKPR7CXsoCavEmWv3W8urZu4eBVgKWaj9iMaVJFZg@mail.gmail.com> <CA%2BhQ2%2BhuoCCweq7fjoYmH3nyhmhb5DzukEdPSMtaJEWa8Ft0JQ@mail.gmail.com> <51FFDD1E.1000206@FreeBSD.org> <CAJ-Vmo=Q9AqdBJ0%2B4AiX4%2BWreYuZx6VGGYw=MZ4XhMB1P2yMww@mail.gmail.com>
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.. and I bet it's not a design pattern, and this is total conjecture on my part: * the original drivers weren't SMP safe; * noone really sat down and figured out how to correctly synchronise all of this stuff; * people did the minimum amount of work to keep the driver from immediately crashing, but didn't really think things through at a larger scale. Almost every driver is this way Luigi. :-) -adrian
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