Messages in this thread Patch in this message | | | Date | Fri, 26 Mar 2021 08:16:46 +0000 | From | Lee Jones <> | Subject | Re: [PATCH v1 1/1] mfd: intel_quark_i2c_gpio: Don't play dirty trick with const |
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On Thu, 25 Mar 2021, Andy Shevchenko wrote:
> As Linus rightfully noticed, the driver plays dirty trick with const, > i.e. it assigns a place holder data structure to the const field > in the MFD cell and then drops the const by explicit casting. This > is not how it should be. > > Replace cell parameter by bar and assign local pointer res to the > respective non-const place holder in the intel_quark_i2c_setup() > and intel_quark_gpio_setup(). > > Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Thanks for spotting this Linus.
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> > --- > drivers/mfd/intel_quark_i2c_gpio.c | 26 ++++++++++++-------------- > 1 file changed, 12 insertions(+), 14 deletions(-) > > diff --git a/drivers/mfd/intel_quark_i2c_gpio.c b/drivers/mfd/intel_quark_i2c_gpio.c > index 7f90e6f022ba..f2bce2ade510 100644 > --- a/drivers/mfd/intel_quark_i2c_gpio.c > +++ b/drivers/mfd/intel_quark_i2c_gpio.c > @@ -157,17 +157,16 @@ static void intel_quark_unregister_i2c_clk(struct device *dev) > clk_unregister(quark_mfd->i2c_clk); > } > > -static int intel_quark_i2c_setup(struct pci_dev *pdev, struct mfd_cell *cell) > +static int intel_quark_i2c_setup(struct pci_dev *pdev, int bar) > { > + struct mfd_cell *cell = &intel_quark_mfd_cells[bar];
What's stopping you from removing the seemingly superfluous 'bar' parameter and simply doing:
struct mfd_cell *cell = &intel_quark_mfd_cells[MFD_I2C_BAR];
> + struct resource *res = intel_quark_i2c_res; > const struct dmi_system_id *dmi_id; > struct dw_i2c_platform_data *pdata; > - struct resource *res = (struct resource *)cell->resources; > struct device *dev = &pdev->dev; > > - res[INTEL_QUARK_IORES_MEM].start = > - pci_resource_start(pdev, MFD_I2C_BAR); > - res[INTEL_QUARK_IORES_MEM].end = > - pci_resource_end(pdev, MFD_I2C_BAR); > + res[INTEL_QUARK_IORES_MEM].start = pci_resource_start(pdev, bar); > + res[INTEL_QUARK_IORES_MEM].end = pci_resource_end(pdev, bar);
If you do end up using 'MFD_I2C_BAR' again in here, please omit the line wrap. 80-char lines are so 1990s!
> res[INTEL_QUARK_IORES_IRQ].start = pci_irq_vector(pdev, 0); > res[INTEL_QUARK_IORES_IRQ].end = pci_irq_vector(pdev, 0); > @@ -189,16 +188,15 @@ static int intel_quark_i2c_setup(struct pci_dev *pdev, struct mfd_cell *cell) > return 0; > }
-- Lee Jones [李琼斯] Senior Technical Lead - Developer Services Linaro.org │ Open source software for Arm SoCs Follow Linaro: Facebook | Twitter | Blog
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