Messages in this thread | | | Date | Tue, 20 Mar 2012 08:19:57 +0100 | From | Sascha Hauer <> | Subject | Re: [PATCH 1/2] clk: Fix error handling in fixed clock hardware type register fn |
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On Mon, Mar 19, 2012 at 08:38:25PM -0700, Saravana Kannan wrote: > If memory allocation for the parents array or the parent string fails, then > fail the registration immediately instead of calling clk_register and > hoping it fails there. > > Return -ENOMEM on failure. > > Signed-off-by: Saravana Kannan <skannan@codeaurora.org> > Cc: Mike Turquette <mturquette@linaro.org> > Cc: Andrew Lunn <andrew@lunn.ch> > Cc: Rob Herring <rob.herring@calxeda.com> > Cc: Russell King <linux@arm.linux.org.uk> > Cc: Jeremy Kerr <jeremy.kerr@canonical.com> > Cc: Thomas Gleixner <tglx@linutronix.de> > Cc: Arnd Bergman <arnd.bergmann@linaro.org> > Cc: Paul Walmsley <paul@pwsan.com> > Cc: Shawn Guo <shawn.guo@freescale.com> > Cc: Sascha Hauer <s.hauer@pengutronix.de> > Cc: Jamie Iles <jamie@jamieiles.com> > Cc: Richard Zhao <richard.zhao@linaro.org> > Cc: Saravana Kannan <skannan@codeaurora.org> > Cc: Magnus Damm <magnus.damm@gmail.com> > Cc: Mark Brown <broonie@opensource.wolfsonmicro.com> > Cc: Linus Walleij <linus.walleij@stericsson.com> > Cc: Stephen Boyd <sboyd@codeaurora.org> > Cc: Amit Kucheria <amit.kucheria@linaro.org> > Cc: Deepak Saxena <dsaxena@linaro.org> > Cc: Grant Likely <grant.likely@secretlab.ca> > --- > There are still some memory free issues when clk_register() fails, but I will > fix it when I fixed the other register() fns to return ENOMEM of alloc > failure instead of a NULL. > > drivers/clk/clk-fixed-rate.c | 10 +++++++--- > 1 files changed, 7 insertions(+), 3 deletions(-) > > diff --git a/drivers/clk/clk-fixed-rate.c b/drivers/clk/clk-fixed-rate.c > index 90c79fb..6423ae9 100644 > --- a/drivers/clk/clk-fixed-rate.c > +++ b/drivers/clk/clk-fixed-rate.c > @@ -61,22 +61,26 @@ struct clk *clk_register_fixed_rate(struct device *dev, const char *name, > parent_names = kmalloc(sizeof(char *), GFP_KERNEL); > > if (! parent_names) > - goto out; > + goto fail_ptr; > > len = sizeof(char) * strlen(parent_name); > > parent_names[0] = kmalloc(len, GFP_KERNEL); > > if (!parent_names[0]) > - goto out; > + goto fail_str; > > strncpy(parent_names[0], parent_name, len); > }
It's easier to add a char *parent to struct clk_fixed and pass it to clk_register with &fixed->parent. This saves you a kmalloc call and makes the error path simpler. It's the same way already done in the divider.
Sascha
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