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Date: Mon, 16 Apr 2018 11:33:26 -0600 From: Lina Iyer <ilina@...eaurora.org> To: Ulf Hansson <ulf.hansson@...aro.org> Cc: "Rafael J . Wysocki" <rjw@...ysocki.net>, Sudeep Holla <sudeep.holla@....com>, Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>, Mark Rutland <mark.rutland@....com>, linux-pm@...r.kernel.org, Kevin Hilman <khilman@...nel.org>, Lina Iyer <lina.iyer@...aro.org>, Rob Herring <robh+dt@...nel.org>, Daniel Lezcano <daniel.lezcano@...aro.org>, Thomas Gleixner <tglx@...utronix.de>, Vincent Guittot <vincent.guittot@...aro.org>, Stephen Boyd <sboyd@...nel.org>, Juri Lelli <juri.lelli@....com>, Geert Uytterhoeven <geert+renesas@...der.be>, linux-arm-kernel@...ts.infradead.org, linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH v7 01/26] PM / Domains: Don't treat zero found compatible idle states as an error On Thu, Apr 12 2018 at 05:14 -0600, Ulf Hansson wrote: >Instead of returning -EINVAL from of_genpd_parse_idle_states() in case none >compatible states was found, let's return 0 to indicate success. Assign >also the out-parameter *states to NULL and *n to 0, to indicate to the >caller that zero states have been found/allocated. > >This enables the caller of of_genpd_parse_idle_states() to easier act on >the returned error code. > >Cc: Lina Iyer <ilina@...eaurora.org> >Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org> Reviewed-by: Lina Iyer <ilina@...eaurora.org> >--- > drivers/base/power/domain.c | 14 ++++++++++---- > 1 file changed, 10 insertions(+), 4 deletions(-) > >diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c >index 1ea0e25..c2ef944 100644 >--- a/drivers/base/power/domain.c >+++ b/drivers/base/power/domain.c >@@ -2331,8 +2331,8 @@ static int genpd_iterate_idle_states(struct device_node *dn, > * > * Returns the device states parsed from the OF node. The memory for the states > * is allocated by this function and is the responsibility of the caller to >- * free the memory after use. If no domain idle states is found it returns >- * -EINVAL and in case of errors, a negative error code. >+ * free the memory after use. If any or zero compatible domain idle states is >+ * found it returns 0 and in case of errors, a negative error code is returned. > */ > int of_genpd_parse_idle_states(struct device_node *dn, > struct genpd_power_state **states, int *n) >@@ -2341,8 +2341,14 @@ int of_genpd_parse_idle_states(struct device_node *dn, > int ret; > > ret = genpd_iterate_idle_states(dn, NULL); >- if (ret <= 0) >- return ret < 0 ? ret : -EINVAL; >+ if (ret < 0) >+ return ret; >+ >+ if (!ret) { >+ *states = NULL; >+ *n = 0; >+ return 0; >+ } > > st = kcalloc(ret, sizeof(*st), GFP_KERNEL); > if (!st) >-- >2.7.4 >
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