Messages in this thread | | | Date | Fri, 20 Oct 2017 15:32:20 +0200 | From | Greg KH <> | Subject | Re: [PATCH 01/12] nvmem: imx-iim: use stack for nvmem_config instead of malloc'ing it |
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On Mon, Oct 09, 2017 at 03:26:30PM +0200, srinivas.kandagatla@linaro.org wrote: > From: Masahiro Yamada <yamada.masahiro@socionext.com> > > nvmem_register() copies all the members of nvmem_config to > nvmem_device. So, nvmem_config is one-time use data during > probing. There is no point to keep it until the driver detach. > Using stack should be no problem because nvmem_config is pretty > small. > > Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> > Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> > --- > drivers/nvmem/imx-iim.c | 27 ++++++++++++--------------- > 1 file changed, 12 insertions(+), 15 deletions(-) > > diff --git a/drivers/nvmem/imx-iim.c b/drivers/nvmem/imx-iim.c > index 52ff65e0673f..a5992602709a 100644 > --- a/drivers/nvmem/imx-iim.c > +++ b/drivers/nvmem/imx-iim.c > @@ -34,7 +34,6 @@ struct imx_iim_drvdata { > struct iim_priv { > void __iomem *base; > struct clk *clk; > - struct nvmem_config nvmem; > }; > > static int imx_iim_read(void *context, unsigned int offset, > @@ -108,7 +107,7 @@ static int imx_iim_probe(struct platform_device *pdev) > struct resource *res; > struct iim_priv *iim; > struct nvmem_device *nvmem; > - struct nvmem_config *cfg; > + struct nvmem_config cfg = {};
You do realize you are now not zeroing out this structure, and have to explicitly initialize all of the fields, right?
What is the real problem with doing a dynamic allocation for this? Putting structures on the stack is a "bad idea" for all of the obvious reasons (small stack in the kernel, initialized data, lower layers expect it to be dma-able, etc.)
thanks,
greg k-h
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