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Date: Mon, 19 Aug 2013 08:10:26 +0530
From: Vivek Gautam <gautamvivek1987@...il.com>
To: Julius Werner <jwerner@...omium.org>
Cc: Vivek Gautam <gautam.vivek@...sung.com>,
"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
"linux-samsung-soc@...r.kernel.org"
<linux-samsung-soc@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Alan Stern <stern@...land.harvard.edu>,
Felipe Balbi <balbi@...com>, kishon <kishon@...com>
Subject: Re: [PATCH] usb: phy: Cleanup error code in **_usb_get_phy_**() APIs
Hi,
On Thu, Aug 8, 2013 at 12:05 AM, Julius Werner <jwerner@...omium.org> wrote:
>> @@ -94,11 +94,11 @@ static int devm_usb_phy_match(struct device *dev, void *res, void *match_data)
>> */
>> struct usb_phy *devm_usb_get_phy(struct device *dev, enum usb_phy_type type)
>> {
>> - struct usb_phy **ptr, *phy;
>> + struct usb_phy *phy = ERR_PTR(-ENOMEM), **ptr;
>
> This looks a little roundabout, don't you think? Why don't you just
> directly have 'return ERR_PTR(-ENOMEM)' down there where you put 'goto
> err0'?
Ok, will change this.
>
>>
>> ptr = devres_alloc(devm_usb_phy_release, sizeof(*ptr), GFP_KERNEL);
>> if (!ptr)
>> - return NULL;
>> + goto err0;
>>
>> phy = usb_get_phy(type);
>> if (!IS_ERR(phy)) {
>> @@ -107,6 +107,7 @@ struct usb_phy *devm_usb_get_phy(struct device *dev, enum usb_phy_type type)
>> } else
>> devres_free(ptr);
>>
>> +err0:
>> return phy;
>> }
>> EXPORT_SYMBOL_GPL(devm_usb_get_phy);
>
>> struct usb_phy *devm_usb_get_phy_dev(struct device *dev, u8 index)
>> {
>> - struct usb_phy **ptr, *phy;
>> + struct usb_phy *phy = ERR_PTR(-ENOMEM), **ptr;
>
> Same here
will change this too.
>
>>
>> ptr = devres_alloc(devm_usb_phy_release, sizeof(*ptr), GFP_KERNEL);
>> if (!ptr)
>> - return NULL;
>> + goto err0;
>>
>> phy = usb_get_phy_dev(dev, index);
>> if (!IS_ERR(phy)) {
>> @@ -267,6 +268,7 @@ struct usb_phy *devm_usb_get_phy_dev(struct device *dev, u8 index)
>> } else
>> devres_free(ptr);
>>
>> +err0:
>> return phy;
>> }
>> EXPORT_SYMBOL_GPL(devm_usb_get_phy_dev);
>
>> @@ -142,7 +142,7 @@ extern void usb_remove_phy(struct usb_phy *);
>> /* helpers for direct access thru low-level io interface */
>> static inline int usb_phy_io_read(struct usb_phy *x, u32 reg)
>> {
>> - if (x->io_ops && x->io_ops->read)
>> + if (!IS_ERR(x) && x->io_ops && x->io_ops->read)
>
> I liked the ones where we had IS_ERR_OR_NULL() here (and in all the
> ones below)... you sometimes have to handle PHYs in
> platform-independent code where you don't want to worry about if this
> platform actually has a PHY driver there or not. Any reason you
> changed that?
The **get_phy_*() APIs never return a NULL pointer now, do we still
need to handle that in that case.
Or are we assuming that code will use these phy operations without
getting a phy in the first place ?
>
>> return x->io_ops->read(x, reg);
>>
>> return -EINVAL;
>> @@ -150,7 +150,7 @@ static inline int usb_phy_io_read(struct usb_phy *x, u32 reg)
>>
>> static inline int usb_phy_io_write(struct usb_phy *x, u32 val, u32 reg)
>> {
>> - if (x->io_ops && x->io_ops->write)
>> + if (!IS_ERR(x) && x->io_ops && x->io_ops->write)
>> return x->io_ops->write(x, val, reg);
>>
>> return -EINVAL;
>> @@ -159,7 +159,7 @@ static inline int usb_phy_io_write(struct usb_phy *x, u32 val, u32 reg)
>> static inline int
>> usb_phy_init(struct usb_phy *x)
>> {
>> - if (x->init)
>> + if (!IS_ERR(x) && x->init)
>> return x->init(x);
>>
>> return 0;
>> @@ -168,26 +168,27 @@ usb_phy_init(struct usb_phy *x)
>> static inline void
>> usb_phy_shutdown(struct usb_phy *x)
>> {
>> - if (x->shutdown)
>> + if (!IS_ERR(x) && x->shutdown)
>> x->shutdown(x);
>> }
>>
>> static inline int
>> usb_phy_vbus_on(struct usb_phy *x)
>> {
>> - if (!x->set_vbus)
>> - return 0;
>> + if (!IS_ERR(x) && x->set_vbus)
>> + return x->set_vbus(x, true);
>>
>> - return x->set_vbus(x, true);
>> + return 0;
>> }
>>
>> static inline int
>> usb_phy_vbus_off(struct usb_phy *x)
>> {
>> - if (!x->set_vbus)
>> - return 0;
>> + if (!IS_ERR(x) && x->set_vbus)
>> + return x->set_vbus(x, false);
>> +
>> + return 0;
>>
>> - return x->set_vbus(x, false);
>> }
>>
>> /* for usb host and peripheral controller drivers */
>> @@ -249,8 +250,9 @@ static inline int usb_bind_phy(const char *dev_name, u8 index,
>> static inline int
>> usb_phy_set_power(struct usb_phy *x, unsigned mA)
>> {
>> - if (x && x->set_power)
>> + if (!IS_ERR(x) && x->set_power)
>> return x->set_power(x, mA);
>> +
>> return 0;
>> }
>>
>> @@ -258,28 +260,28 @@ usb_phy_set_power(struct usb_phy *x, unsigned mA)
>> static inline int
>> usb_phy_set_suspend(struct usb_phy *x, int suspend)
>> {
>> - if (x->set_suspend != NULL)
>> + if (!IS_ERR(x) && x->set_suspend != NULL)
>> return x->set_suspend(x, suspend);
>> - else
>> - return 0;
>> +
>> + return 0;
>> }
>>
>> static inline int
>> usb_phy_notify_connect(struct usb_phy *x, enum usb_device_speed speed)
>> {
>> - if (x->notify_connect)
>> + if (!IS_ERR(x) && x->notify_connect)
>> return x->notify_connect(x, speed);
>> - else
>> - return 0;
>> +
>> + return 0;
>> }
>>
>> static inline int
>> usb_phy_notify_disconnect(struct usb_phy *x, enum usb_device_speed speed)
>> {
>> - if (x->notify_disconnect)
>> + if (!IS_ERR(x) && x->notify_disconnect)
>> return x->notify_disconnect(x, speed);
>> - else
>> - return 0;
>> +
>> + return 0;
>> }
>
> Otherwise looks good to me.
Thanks !!
--
Best Regards
Vivek
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