On Wed, 2015-11-11 at 13:41 -0800, Brian Norris wrote:
> One more small comment, since you're respinning this:
>
> On Fri, Nov 06, 2015 at 11:48:08PM +0800, Bayi Cheng wrote:
> > diff --git a/drivers/mtd/spi-nor/mtk-quadspi.c b/drivers/mtd/spi-nor/mtk-quadspi.c
> > new file mode 100644
> > index 0000000..6582811
> > --- /dev/null
> > +++ b/drivers/mtd/spi-nor/mtk-quadspi.c
> > @@ -0,0 +1,475 @@
>
> ...
>
> > +static int mtk_nor_drv_probe(struct platform_device *pdev)
> > +{
> > + struct device_node *flash_np;
> > + struct resource *res;
> > + int ret;
> > + struct mt8173_nor *mt8173_nor;
> > +
> > + if (!pdev->dev.of_node) {
> > + dev_err(&pdev->dev, "No DT found\n");
> > + return -EINVAL;
> > + }
> > +
> > + mt8173_nor = devm_kzalloc(&pdev->dev, sizeof(*mt8173_nor), GFP_KERNEL);
> > + if (!mt8173_nor)
> > + return -ENOMEM;
> > + platform_set_drvdata(pdev, mt8173_nor);
> > +
> > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > + mt8173_nor->base = devm_ioremap_resource(&pdev->dev, res);
> > + if (IS_ERR(mt8173_nor->base))
> > + return PTR_ERR(mt8173_nor->base);
> > +
> > + mt8173_nor->spi_clk = devm_clk_get(&pdev->dev, "spi");
> > + if (IS_ERR(mt8173_nor->spi_clk)) {
> > + ret = PTR_ERR(mt8173_nor->spi_clk);
> > + goto nor_free;
> > + }
> > +
> > + mt8173_nor->nor_clk = devm_clk_get(&pdev->dev, "sf");
> > + if (IS_ERR(mt8173_nor->nor_clk)) {
> > + ret = PTR_ERR(mt8173_nor->nor_clk);
> > + goto nor_free;
> > + }
> > +
> > + mt8173_nor->dev = &pdev->dev;
> > + clk_prepare_enable(mt8173_nor->spi_clk);
> > + clk_prepare_enable(mt8173_nor->nor_clk);
>
> You enable the clocks here, but...
>
> > +
> > + /* only support one attached flash */
> > + flash_np = of_get_next_available_child(pdev->dev.of_node, NULL);
> > + if (!flash_np) {
>
> ... you might bail out here if there is no available flash node, and you
> never disable the clocks. (Same is true if we fail to detect the flash;
> you leave the no-longer-needed clocks enabled.) Seems like maybe you
> should disable clocks on failure.
Yes, I have forgot to disable these clocks on failure. and I will fix it
in the next patch! Thanks!
>
> > + dev_err(&pdev->dev, "no SPI flash device to configure\n");
> > + ret = -ENODEV;
> > + goto nor_free;
> > + }
> > + ret = mtk_nor_init(mt8173_nor, flash_np);
> > +
> > +nor_free:
> > + return ret;
> > +}
>
> Brian
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