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Date: Fri, 19 Sep 2014 10:19:20 -0500 From: Josh Cartwright <joshc@...eaurora.org> To: Guenter Roeck <linux@...ck-us.net> Cc: Bjorn Andersson <bjorn.andersson@...ymobile.com>, Linus Walleij <linus.walleij@...aro.org>, linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-arm-msm@...r.kernel.org, Pramod Gurav <pramod.gurav@...rtplayin.com> Subject: Re: [PATCH] pinctrl: qcom: use restart_notifier mechanism for ps_hold On Thu, Sep 18, 2014 at 08:34:41PM -0700, Guenter Roeck wrote: > On 09/18/2014 07:54 PM, Guenter Roeck wrote: > >On 09/18/2014 03:32 PM, Josh Cartwright wrote: > >>By converting to the restart_notifier mechanism for restart, we allow > >>for other mechanisms, like the watchdog, to be used for restart in the > >>case where PS_HOLD has failed to reset the chip. > >> > >>Choose priority 128, as according to documentation, this mechanism "is > >>sufficient to restart the entire system". > >> > >>Cc: Pramod Gurav <pramod.gurav@...rtplayin.com> > >>Cc: Guenter Roeck <linux@...ck-us.net> > >>Signed-off-by: Josh Cartwright <joshc@...eaurora.org> > >>--- [..] > >> int msm_pinctrl_probe(struct platform_device *pdev, > >> const struct msm_pinctrl_soc_data *soc_data) > >>@@ -943,6 +948,15 @@ int msm_pinctrl_remove(struct platform_device *pdev) > >> > >> pinctrl_unregister(pctrl->pctrl); > >> > >>+ if (pctrl->restart_nb.notifier_call) { > > One more comment: The conditional is really unnecessary. Just let > unregister_restart_handler deal with it ... > > >>+ ret = unregister_restart_handler(&pctrl->restart_nb); > > and just ignore the error return. The function will only return an error > if the entry was not found, and then it is a don't care. Awesome, thanks. I like simplifications :). I was hijacking notifier_call to indicate whether or not the restart notifier was registered at all (because it's conditional on the particular chipset having a "ps_hold" function). But, nice to know unregister_restart_handler() does the right thing if the handler wasn't registered in the first place. Josh -- Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation -- 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/
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