On Tue, Jan 21, 2014 at 04:59:35PM +0000, Mark Brown wrote: > On Mon, Jan 20, 2014 at 11:47:34PM +0000, Alan Cox wrote: > > They should have followed proper practice and reserved their minors. The > > device number belongs to the Altix. The driver should just move. > > They should have done that about a decade ago when this stuff was > introduced, yes. At some point one has to accept and deal with the > world as it is. Let's look at the facts, shall we? We have several drivers which I was involved in, which include the original AMBA PL010 driver, the SA11x0 serial driver, and the Footbridge driver. Both of those had been around for some time in earlier kernels. I remember there being a discussion about the major/minor numbers, and the conclusion which came out of that was to have this "low density serial ports" major, and allocate minor numbers from that. So I applied for minor numbers for these drivers, and HPA at the time granted them. Here's an exmaple: | Russell King wrote: | > | > Hi hpa, | > | > Did you get my previous mail about this device allocation? If not, here | > is the request (although its hard to put it together without an up to | > date devices.txt list): | > | > Major: 204 | > Minor: 16 | > Number of minors: 16 | > Non-devfs name: ttyAM0 to ttyAM15 | > Description: ARM "AMBA" serial ports | > | > Major: 205 | > Minor: 16 | > Number of minors: 16 | > Non-devfs name: cuaam to cuaam15 | > Description: Callout device for ttyAM0 to ttyAM15 | > | | Approved as written. Others did the same (previously) for the StrongARM driver (which was Nicolas). During the 2.3/2.4 era, the clps711x serial driver was added, and that re-used the above allocations since it was believed at the time that there would be no overlap (they'd only appear on SoCs and you would never have one of each type on each SoC). So, the clps711x serial driver never had an offical allocation at that time. Later on, it transitioned to using its own minors (which now conflicts). Exactly when that happened, I'm not sure - sometime between Jan and July 2002. However, the clps711x driver went in as a side effect of the need to replace the old serial.c driver with something better - and it was decided that my serial_core and serial rewrite was the desired way forward. So that stuff got sucked in with no official allocation - that was an oversight on my part. At some point after that, the amba PL011 driver was added - I can't pin that down, because the history from the 2.5/early 2.6 is lost to me (and I can't sanely get access to the Linux history git... not with the state of my DSL.) Looking at the patch archive I have, it may have been around patch-2.6.0-test2 time when amba-pl011 came into being, which places that around 5th August 2003, but I can't see when it went into mainline since I stopped producing patches in December 2003, but we can be certain that it was after 2003. Now, I'm certain of my facts here that LANANA stopped being useful around this time - especially so now that I've found an email from 2004: | Date: Wed, 23 Jun 2004 10:07:54 -0500 | From: Erik Jacobson <erikj@xxxxxxxxxxxxxxxxxxxxxxx> | Subject: Re: [PATCH 2.6] Altix serial driver | Message-ID: <Pine.SGI.4.53.0406231005110.280312@xxxxxxxxxxxxxxxxxxxxxxx> | | LANANA has been unresponsive and their site states they aren't accepting | 2.6 submissions. So here we have evidence that I'm not the only one who stumbled across LANANA becoming a problem - and it becoming impossible to have additional numbers allocated in that range. Here's more evidence, from later on, which appears to show when LANANA resumed: | From: David Woodhouse <dwmw2@xxxxxxxxxxxxx> | To: device@xxxxxxxxxx | Cc: benh@xxxxxxxxxxxxxxxxxxx, rmk+serial@xxxxxxxxxxxxxxxx | Date: Fri, 01 Dec 2006 15:40:23 +0000 | Message-Id: <1164987623.12649.36.camel@xxxxxxxxxxxxxxxxxx> | | Please assign four minor numbers from major 204, for the pmac_zilog | driver. | | Thanks. To which LANANA never responded, so it was followed up: | From: David Woodhouse <dwmw2@xxxxxxxxxxxxx> | To: device@xxxxxxxxxx | Cc: benh@xxxxxxxxxxxxxxxxxxx, rmk+serial@xxxxxxxxxxxxxxxx | Date: Fri, 30 Mar 2007 04:11:52 +0100 | Message-Id: <1175224312.3122.113.camel@xxxxxxxxxxxxxxxxxx> | | On Fri, 2006-12-01 at 15:40 +0000, David Woodhouse wrote: | > Please assign four minor numbers from major 204, for the pmac_zilog | > driver. | | Pretty please? And this finally resulted in numbers being allocated again, this time by Torben Mathiasen. Now, I had - and have - absolutely *no* problem with this process... and if it had been available for allocating the ttyAMA numbers properly, I would have definitely used it - for the sole reason that it is the only sane thing to do. But it wasn't available, and something had to be done. Unlike Alan's comments which would have you believe that LANANA has been operating continuously, it seems that the evidence I have backs up my claim, and supports the reason why these drivers never had an official allocation, and it's certainly *not* through lack of common sense or the intention of creating "a turd" - which I take great offence to those accusations. I did the best I could at that time given the circumstances that were prevailing. -- FTTC broadband for 0.8mile line: 5.8Mbps down 500kbps up. Estimation in database were 13.1 to 19Mbit for a good line, about 7.5+ for a bad. Estimate before purchase was "up to 13.2Mbit". -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
