On Sun, Dec 16, 2018 at 03:09:16PM -0800, Andrey Smirnov wrote:
> Convert all fallthrough comments to say "fall through", as well as
> modify their placement to the point where the "break" would normally
> be.
>
> Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
> Cc: Fabio Estevam <fabio.estevam@xxxxxxx>
> Cc: Chris Healy <cphealy@xxxxxxxxx>
> Cc: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
> Cc: Leonard Crestez <leonard.crestez@xxxxxxx>
> Cc: "A.s. Dong" <aisheng.dong@xxxxxxx>
> Cc: Richard Zhu <hongxing.zhu@xxxxxxx>
> Cc: linux-imx@xxxxxxx
> Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> Cc: linux-kernel@xxxxxxxxxxxxxxx
> Cc: linux-pci@xxxxxxxxxxxxxxx
> Suggested-by: Bjorn Helgaas <helgaas@xxxxxxxxxx>
I didn't make it very clear, but my suggestion was really to remove
the annotation completely; see below.
> Signed-off-by: Andrey Smirnov <andrew.smirnov@xxxxxxxxx>
> ---
> drivers/pci/controller/dwc/pci-imx6.c | 14 +++++++++-----
> 1 file changed, 9 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
> index 59658577e81d..a0510e185d44 100644
> --- a/drivers/pci/controller/dwc/pci-imx6.c
> +++ b/drivers/pci/controller/dwc/pci-imx6.c
> @@ -362,7 +362,8 @@ static void imx6_pcie_assert_core_reset(struct imx6_pcie *imx6_pcie)
>
> switch (imx6_pcie->variant) {
> case IMX7D:
> - case IMX8MQ: /* FALLTHROUGH */
> + /* fall through */
> + case IMX8MQ:
> reset_control_assert(imx6_pcie->pciephy_reset);
> reset_control_assert(imx6_pcie->apps_reset);
> break;
IMO this use of "fall through" is superfluous and unusual in the Linux
source.
A "fall through" comment would be useful if the IMX7D case had
executable code but no "break". Then the comment shows that the
intent was to execute *both* the IMX7D code and the IMX8MQ code and
the lack of a "break" was intentional.
In this case, the intent is to treat IMX7D and IMX8MQ the same, and
there's no executable code specifically for the IMX7D. I think it's
easiest to read that when the list of identical cases is all together
without the comment in the middle, i.e., as
> case IMX7D:
> case IMX8MQ:
> reset_control_assert(imx6_pcie->pciephy_reset);
rather than this:
> case IMX7D:
> /* fall through */
> case IMX8MQ:
> reset_control_assert(imx6_pcie->pciephy_reset);
