linux-kernel - Re: [PATCH 1/2] usb: ehci-platform: use reset array API

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Message-ID: <CAK7LNAQSJhx0cFvoCkwssgCim0G=bA9H_p1HaGDToVGv2Dr-nQ@mail.gmail.com>
Date:   Thu, 2 Nov 2017 00:49:40 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Alan Stern <stern@...land.harvard.edu>
Cc:     linux-usb@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Tony Prisk <linux@...sktech.co.nz>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 1/2] usb: ehci-platform: use reset array API

Hi Alan,

2017-11-02 0:32 GMT+09:00 Alan Stern <stern@...land.harvard.edu>:
> On Mon, 30 Oct 2017, Masahiro Yamada wrote:
>
>> Generic drivers like this need to control arbitrary numbers of reset
>> lines.  Instead of hard-coding the maximum number of resets, use the
>> reset array API.  It can manage a bunch of resets behind the scene.
>>
>> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
>> ---
>>  drivers/usb/host/ehci-platform.c | 33 +++++++++++----------------------
>>  1 file changed, 11 insertions(+), 22 deletions(-)
>>
>> diff --git a/drivers/usb/host/ehci-platform.c b/drivers/usb/host/ehci-platform.c
>> index f1908ea..64fd643 100644
>> --- a/drivers/usb/host/ehci-platform.c
>> +++ b/drivers/usb/host/ehci-platform.c
>> @@ -40,12 +40,11 @@
>>
>>  #define DRIVER_DESC "EHCI generic platform driver"
>>  #define EHCI_MAX_CLKS 4
>> -#define EHCI_MAX_RSTS 4
>>  #define hcd_to_ehci_priv(h) ((struct ehci_platform_priv *)hcd_to_ehci(h)->priv)
>>
>>  struct ehci_platform_priv {
>>       struct clk *clks[EHCI_MAX_CLKS];
>> -     struct reset_control *rsts[EHCI_MAX_RSTS];
>> +     struct reset_control *rsts;
>>       struct phy **phys;
>>       int num_phys;
>>       bool reset_on_resume;
>> @@ -151,7 +150,7 @@ static int ehci_platform_probe(struct platform_device *dev)
>>       struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev);
>>       struct ehci_platform_priv *priv;
>>       struct ehci_hcd *ehci;
>> -     int err, irq, phy_num, clk = 0, rst;
>> +     int err, irq, phy_num, clk = 0;
>>
>>       if (usb_disabled())
>>               return -ENODEV;
>> @@ -239,21 +238,13 @@ static int ehci_platform_probe(struct platform_device *dev)
>>               }
>>       }
>>
>> -     for (rst = 0; rst < EHCI_MAX_RSTS; rst++) {
>> -             priv->rsts[rst] = devm_reset_control_get_shared_by_index(
>> -                                     &dev->dev, rst);
>> -             if (IS_ERR(priv->rsts[rst])) {
>> -                     err = PTR_ERR(priv->rsts[rst]);
>> -                     if (err == -EPROBE_DEFER)
>> -                             goto err_reset;
>> -                     priv->rsts[rst] = NULL;
>> -                     break;
>> -             }
>> +     priv->rsts = devm_reset_control_array_get_optional_shared(&dev->dev);
>> +     if (IS_ERR(priv->rsts))
>> +             return PTR_ERR(priv->rsts);
>
> You must not return.  Instead you should set err and jump to
> err_put_clks.
>

Good catch!

Will fix.

Thank you!



-- 
Best Regards
Masahiro Yamada