linux-kernel - Re: [PATCH v2 1/6] usb: ehci-exynos: Use devm_clk_get

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date: Thu, 4 Apr 2024 15:54:08 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Anand Moon <linux.amoon@...il.com>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Alan Stern <stern@...land.harvard.edu>,
 Alim Akhtar <alim.akhtar@...sung.com>,
 Christophe JAILLET <christophe.jaillet@...adoo.fr>,
 Johan Hovold <johan@...nel.org>, linux-usb@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-samsung-soc@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/6] usb: ehci-exynos: Use devm_clk_get_enabled()
 helpers

On 04/04/2024 15:52, Anand Moon wrote:
> Hi Greg,
> 
> On Thu, 4 Apr 2024 at 18:30, Greg Kroah-Hartman
> <gregkh@...uxfoundation.org> wrote:
>>
>> On Thu, Apr 04, 2024 at 12:43:17PM +0530, Anand Moon wrote:
>>> The devm_clk_get_enabled() helpers:
>>>     - call devm_clk_get()
>>>     - call clk_prepare_enable() and register what is needed in order to
>>>      call clk_disable_unprepare() when needed, as a managed resource.
>>>
>>> This simplifies the code and avoids the calls to clk_disable_unprepare().
>>>
>>> While at it, use dev_err_probe consistently, and use its return value
>>> to return the error code.
>>>
>>> Signed-off-by: Anand Moon <linux.amoon@...il.com>
>>> ---
>>> V2: drop the clk_disable_unprepare in suspend/resume functions
>>>     fix the usb_put_hcd return before the devm_clk_get_enabled
>>> ---
>>>  drivers/usb/host/ehci-exynos.c | 19 +++++--------------
>>>  1 file changed, 5 insertions(+), 14 deletions(-)
>>>
>>> diff --git a/drivers/usb/host/ehci-exynos.c b/drivers/usb/host/ehci-exynos.c
>>> index f644b131cc0b..f00bfd0b13dc 100644
>>> --- a/drivers/usb/host/ehci-exynos.c
>>> +++ b/drivers/usb/host/ehci-exynos.c
>>> @@ -159,20 +159,15 @@ static int exynos_ehci_probe(struct platform_device *pdev)
>>>
>>>       err = exynos_ehci_get_phy(&pdev->dev, exynos_ehci);
>>>       if (err)
>>> -             goto fail_clk;
>>> -
>>> -     exynos_ehci->clk = devm_clk_get(&pdev->dev, "usbhost");
>>> +             goto fail_io;
>>>
>>> +     exynos_ehci->clk = devm_clk_get_enabled(&pdev->dev, "usbhost");
>>>       if (IS_ERR(exynos_ehci->clk)) {
>>> -             dev_err(&pdev->dev, "Failed to get usbhost clock\n");
>>> -             err = PTR_ERR(exynos_ehci->clk);
>>> -             goto fail_clk;
>>> +             usb_put_hcd(hcd);
>>> +             return dev_err_probe(&pdev->dev, PTR_ERR(exynos_ehci->clk),
>>> +                               "Failed to get usbhost clock\n");
>>
>> Why is this logic changed?
>>
>> If you want to call dev_err_probe(), that's great, but do NOT mix it up
>> with a commit that does something totally different.
>>
>> When you say something like "while at it" in a changelog text, that is a
>> HUGE hint that it needs to be a separate commit.  Because of that reason
>> alone, I can't take these, you know better :(
>>
>> thanks,
>>
> 
> Ok, I will improve the commit message relevant to the code changes.

Please read Greg's message one more time. He did not propose to fix
commit msg, right?

Best regards,
Krzysztof