linux-kernel - Re: [RFC][PATCH] alarmtimers: Handle late rtc module loading

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 linux-hardening linux-cve-announce 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]

Message-ID: <1308335616.3606.4.camel@work-vm>
Date:	Fri, 17 Jun 2011 11:33:36 -0700
From:	John Stultz <john.stultz@...aro.org>
To:	Meelis Roos <mroos@...ee>
Cc:	Linux Kernel list <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [RFC][PATCH] alarmtimers: Handle late rtc module loading

On Fri, 2011-06-17 at 12:43 +0300, Meelis Roos wrote:
> > Meelis: Could you give this patch a shot to make sure it resolves
> > the issues you've seen on x86 and sparc?
> 
> Worked on sparc64 (Netra X1) on all 3 boots, on top of 
> 3.0.0-rc3-00202-geb96c92.
> 
> One the PC, I get the following about RTC in dmesg:
> 
> [    0.319145] drivers/rtc/hctosys.c: unable to open rtc device (rtc0)
> [    3.614132] rtc_cmos 00:03: RTC can wake from S4
> [    3.614480] rtc_cmos 00:03: rtc core: registered rtc_cmos as rtc0
> [    3.614582] rtc0: alarms up to one year, y3k, 114 bytes nvram

I'll double check, but I suspect that "unable to open rtc device"
message isn't new. The issue is that the rtc_cmos driver is built as a
module, and the hctosys functionality is running before the module is
loaded.

Hmmm. This maybe points to the need for some sort of callback system for
when RTC devices are registered. Since most existing code is just hoping
its available by late_init.

Thanks so much for the testing!

thanks
-john


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/