linux-kernel - Re: [PATCH v4] PCI: tegra: add PM-ops support

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Date:	Wed, 22 Oct 2014 17:09:36 -0600
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Vidya Sagar <vidyas@...dia.com>
Cc:	thierry.reding@...il.com, swarren@...dotorg.org, kthota@...dia.com,
	linux-tegra@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] PCI: tegra: add PM-ops support

On Mon, Oct 13, 2014 at 03:20:03PM +0530, Vidya Sagar wrote:
> adds support for suspend_noirq and resume_noirq hooks
> of PM framework. Enables powergating of PCIe partition during
> suspend.
> It also separates allocation part from
> tegra_pcie_enable_msi() to make a new API tegra_pcie_alloc_msi()
> to avoid passing extra param in the original API

This sounds like it should be two separate patches (a changelog that says
"It also ..." is a good clue).

Maybe even three patches -- the additions in tegra_pcie_power_off() look
like they are separable from the dev_pm_ops addition, because
tegra_pcie_power_off() is already present and used even before you add
dev_pm_ops.

Generally, my advice is that if you *can* separate it, you should do so.
It's very easy to squash things back together, and separating things makes
errors more obvious and bisection more useful.

> -static int tegra_pcie_enable(struct tegra_pcie *pcie)
> +static int tegra_pcie_check_ports(struct tegra_pcie *pcie)

"check_ports" is a not really a very good function name because it doesn't
give any clues about what we're checking or what return value to expect.

Bjorn
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