linux-kernel - Re: [PATCH 1/2] AB3100 regulator support v2

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Date:	Wed, 2 Sep 2009 00:10:03 +0200
From:	Linus Walleij <linus.ml.walleij@...il.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Linus Walleij <linus.walleij@...ricsson.com>,
	Liam Girdwood <lrg@...mlogic.co.uk>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] AB3100 regulator support v2

2009/9/2 Linus Walleij <linus.ml.walleij@...il.com>:

[SIGKILL]
> In the general sense perhaps this doesn't happen so much,
> what we've seen is system shut down, here some code get
> interrupted by signals, so atleast the shut down path should be
> protected I guess, I will do that in the U300 board setup
> pm_poweroff() hook then, which calls down the
> regulator/ab3100/i2c chain so all that is secured.

Or rather, I already do (I forgot about adding in that code!)

+ */
+void u300_pm_poweroff(void)
+{
+       sigset_t old, all;
+
+       sigfillset(&all);
+       if (!sigprocmask(SIG_BLOCK, &all, &old)) {
+               /* Disable LDO D to shut down the system */
+               if (main_power_15)
+                       regulator_disable(main_power_15);
+               else
+                       pr_err("regulator not available to shut down system\n");
+               (void) sigprocmask(SIG_SETMASK, &old, NULL);
+       }
+       return;
+}

Linus Walleij
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