From: Andy Shevchenko <andy.shevchenko@gmail.com> To: Chanwoo Choi <cw00.choi@samsung.com> Cc: MyungJoo Ham <myungjoo.ham@samsung.com>, USB <linux-usb@vger.kernel.org>, Felipe Balbi <balbi@kernel.org>, Guenter Roeck <linux@roeck-us.net>, "Krogerus, Heikki" <heikki.krogerus@linux.intel.com>, rogerq@ti.com, Linux PM <linux-pm@vger.kernel.org>, "Rafael J. Wysocki" <rafael@kernel.org>, Sebastian Reichel <sre@kernel.org>, Linux OMAP Mailing List <linux-omap@vger.kernel.org>, Darren Hart <dvhart@infradead.org>, Platform Driver <platform-driver-x86@vger.kernel.org>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, Chen-Yu Tsai <wens@csie.org>, Hans de Goede <hdegoede@redhat.com> Subject: Re: [PATCH v1 2/5] extcon: Return -EPROBE_DEFER when extcon device is not found Date: Wed, 14 Nov 2018 12:20:04 +0200 [thread overview] Message-ID: <CAHp75VcJwR7S8t2jSyRvtjKCwaUA5Pu=EL3+MjCgf3SVWnChEQ@mail.gmail.com> (raw) In-Reply-To: <5BEBEF7C.7060003@samsung.com> On Wed, Nov 14, 2018 at 11:48 AM Chanwoo Choi <cw00.choi@samsung.com> wrote: > > On 2018년 11월 14일 18:36, Andy Shevchenko wrote: > > On Wed, Nov 14, 2018 at 06:13:37PM +0900, Chanwoo Choi wrote: > >> On 2018년 11월 14일 17:35, Andy Shevchenko wrote: > >>> On Wed, Nov 14, 2018 at 1:53 AM Chanwoo Choi <cw00.choi@samsung.com> wrote: > >>> > >>>> I was thinking about again to change from NULL to EPROBE_DEFER. > >>>> > >>>> extcon_get_extcon_dev() function was almost called in the probe function. > >>>> But, this function might be called on other position instead of probe. > >>> > >>> *Might be* sounds like a theoretical thing, care to share what is in you mind? > >>> Current users and more important the new coming one are *all* doing the same. > >>> > >>>> ENODEV is more correct error instead of EPROBE_DEFER. > >>> > >>> So, you are proposing to continue duplicating conversion from ENODEV > >>> to EPROBE_DEFER in *each* caller? > >> > >> The extcon core don't know the caller situation is in either probe() or other position > >> in the caller driver. The caller driver should decide the kind of error value > >> by using the return value of extcon_get_extcon_dev(). > >> > >> extcon_get_extcon_dev() function cannot be modified for only one case. > >> If some device driver call extcon_get_extcon_dev() out of probe() fuction, > >> EPROBE_DEFER is not always correct. > > > > I agree with this, but look at the current state of affairs. All users do the same. > > If we need to have another case we may consider this later. > > Because we know the potential wrong case of this change, I can't agree this change. > If extcon_get_extcon_dev() returns ENODEV instead of EPROBE_DEFER, > it is clear and then there are no problem on both current and future. Changing NULL to -ENODEV is a trading bad to worse. I would not go that way, so, it's your call. > > API inside the kernel are not carved in the stone. Only can repeat myself (see above). While I see *theoretical* rationale on your side, mine has *practical* proofs. So, I'm giving up on this and will duplicate same what it's done in 4 current callers. -- With Best Regards, Andy Shevchenko
WARNING: multiple messages have this Message-ID (diff)
From: Andy Shevchenko <andy.shevchenko@gmail.com> To: Chanwoo Choi <cw00.choi@samsung.com> Cc: MyungJoo Ham <myungjoo.ham@samsung.com>, USB <linux-usb@vger.kernel.org>, Felipe Balbi <balbi@kernel.org>, Guenter Roeck <linux@roeck-us.net>, "Krogerus, Heikki" <heikki.krogerus@linux.intel.com>, rogerq@ti.com, Linux PM <linux-pm@vger.kernel.org>, "Rafael J. Wysocki" <rafael@kernel.org>, Sebastian Reichel <sre@kernel.org>, Linux OMAP Mailing List <linux-omap@vger.kernel.org>, Darren Hart <dvhart@infradead.org>, Platform Driver <platform-driver-x86@vger.kernel.org>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, Chen-Yu Tsai <wens@csie.org>, Hans de Goede <hdegoede@redhat.com> Subject: [v1,2/5] extcon: Return -EPROBE_DEFER when extcon device is not found Date: Wed, 14 Nov 2018 12:20:04 +0200 [thread overview] Message-ID: <CAHp75VcJwR7S8t2jSyRvtjKCwaUA5Pu=EL3+MjCgf3SVWnChEQ@mail.gmail.com> (raw) On Wed, Nov 14, 2018 at 11:48 AM Chanwoo Choi <cw00.choi@samsung.com> wrote: > > On 2018년 11월 14일 18:36, Andy Shevchenko wrote: > > On Wed, Nov 14, 2018 at 06:13:37PM +0900, Chanwoo Choi wrote: > >> On 2018년 11월 14일 17:35, Andy Shevchenko wrote: > >>> On Wed, Nov 14, 2018 at 1:53 AM Chanwoo Choi <cw00.choi@samsung.com> wrote: > >>> > >>>> I was thinking about again to change from NULL to EPROBE_DEFER. > >>>> > >>>> extcon_get_extcon_dev() function was almost called in the probe function. > >>>> But, this function might be called on other position instead of probe. > >>> > >>> *Might be* sounds like a theoretical thing, care to share what is in you mind? > >>> Current users and more important the new coming one are *all* doing the same. > >>> > >>>> ENODEV is more correct error instead of EPROBE_DEFER. > >>> > >>> So, you are proposing to continue duplicating conversion from ENODEV > >>> to EPROBE_DEFER in *each* caller? > >> > >> The extcon core don't know the caller situation is in either probe() or other position > >> in the caller driver. The caller driver should decide the kind of error value > >> by using the return value of extcon_get_extcon_dev(). > >> > >> extcon_get_extcon_dev() function cannot be modified for only one case. > >> If some device driver call extcon_get_extcon_dev() out of probe() fuction, > >> EPROBE_DEFER is not always correct. > > > > I agree with this, but look at the current state of affairs. All users do the same. > > If we need to have another case we may consider this later. > > Because we know the potential wrong case of this change, I can't agree this change. > If extcon_get_extcon_dev() returns ENODEV instead of EPROBE_DEFER, > it is clear and then there are no problem on both current and future. Changing NULL to -ENODEV is a trading bad to worse. I would not go that way, so, it's your call. > > API inside the kernel are not carved in the stone. Only can repeat myself (see above). While I see *theoretical* rationale on your side, mine has *practical* proofs. So, I'm giving up on this and will duplicate same what it's done in 4 current callers.
next prev parent reply other threads:[~2018-11-14 10:20 UTC|newest] Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-11-10 18:10 [PATCH v1 1/5] drivercore: Revert "deferral race condition fix" Andy Shevchenko 2018-11-10 18:10 ` [v1,1/5] " Andy Shevchenko 2018-11-10 18:10 ` [PATCH v1 2/5] extcon: Return -EPROBE_DEFER when extcon device is not found Andy Shevchenko 2018-11-10 18:10 ` [v1,2/5] " Andy Shevchenko 2018-11-10 18:39 ` [PATCH v1 2/5] " Guenter Roeck 2018-11-10 18:39 ` [v1,2/5] " Guenter Roeck 2018-11-11 0:06 ` [PATCH v1 2/5] " Sebastian Reichel 2018-11-11 0:06 ` [v1,2/5] " Sebastian Reichel 2018-11-12 0:24 ` [PATCH v1 2/5] " Chanwoo Choi 2018-11-12 0:24 ` [v1,2/5] " Chanwoo Choi 2018-11-13 23:52 ` [PATCH v1 2/5] " Chanwoo Choi 2018-11-13 23:52 ` [v1,2/5] " Chanwoo Choi 2018-11-14 8:35 ` [PATCH v1 2/5] " Andy Shevchenko 2018-11-14 8:35 ` [v1,2/5] " Andy Shevchenko 2018-11-14 9:13 ` [PATCH v1 2/5] " Chanwoo Choi 2018-11-14 9:13 ` [v1,2/5] " Chanwoo Choi 2018-11-14 9:36 ` [PATCH v1 2/5] " Andy Shevchenko 2018-11-14 9:36 ` [v1,2/5] " Andy Shevchenko 2018-11-14 9:48 ` [PATCH v1 2/5] " Chanwoo Choi 2018-11-14 9:48 ` [v1,2/5] " Chanwoo Choi 2018-11-14 10:20 ` Andy Shevchenko [this message] 2018-11-14 10:20 ` Andy Shevchenko 2018-11-14 11:05 ` [PATCH v1 2/5] " Chanwoo Choi 2018-11-14 11:05 ` [v1,2/5] " Chanwoo Choi 2018-11-14 11:17 ` [PATCH v1 2/5] " Andy Shevchenko 2018-11-14 11:17 ` [v1,2/5] " Andy Shevchenko 2018-11-14 14:04 ` [PATCH v1 2/5] " Andy Shevchenko 2018-11-14 14:04 ` [v1,2/5] " Andy Shevchenko 2018-11-15 1:16 ` [PATCH v1 2/5] " Chanwoo Choi 2018-11-15 1:16 ` [v1,2/5] " Chanwoo Choi 2018-11-12 11:47 ` [PATCH v1 2/5] " Heikki Krogerus 2018-11-12 11:47 ` [v1,2/5] " Heikki Krogerus 2018-11-10 18:10 ` [PATCH v1 3/5] staging: typec: fusb302: Rename fcs,extcon-name to linux,extcon-name Andy Shevchenko 2018-11-10 18:10 ` [v1,3/5] " Andy Shevchenko 2018-11-10 18:40 ` [PATCH v1 3/5] " Guenter Roeck 2018-11-10 18:40 ` [v1,3/5] " Guenter Roeck 2018-11-10 18:11 ` [PATCH v1 4/5] usb: dwc3: drd: Switch to device property for 'extcon' handling Andy Shevchenko 2018-11-10 18:11 ` [v1,4/5] " Andy Shevchenko 2018-11-12 11:47 ` [PATCH v1 4/5] " Felipe Balbi 2018-11-12 11:47 ` [v1,4/5] " Felipe Balbi 2018-11-12 11:47 ` [PATCH v1 4/5] " Felipe Balbi 2018-11-10 18:11 ` [PATCH v1 5/5] usb: dwc3: drd: Add support for DR detection through extcon Andy Shevchenko 2018-11-10 18:11 ` [v1,5/5] " Andy Shevchenko 2018-11-10 18:26 ` [PATCH v1 1/5] drivercore: Revert "deferral race condition fix" Greg Kroah-Hartman 2018-11-10 18:26 ` [v1,1/5] " Greg Kroah-Hartman 2018-11-10 18:36 ` [PATCH v1 1/5] " Andy Shevchenko 2018-11-10 18:36 ` [v1,1/5] " Andy Shevchenko 2018-11-11 11:45 ` [PATCH v1 1/5] " Hans de Goede 2018-11-11 11:45 ` [v1,1/5] " Hans de Goede 2018-11-11 13:04 ` [PATCH v1 1/5] " Andy Shevchenko 2018-11-11 19:26 ` Rob Herring 2018-11-11 23:53 ` Andy Shevchenko 2018-11-14 23:25 ` Grant Likely 2018-11-12 16:11 ` Peter Ujfalusi 2018-11-12 16:11 ` [v1,1/5] " Peter Ujfalusi 2018-11-12 16:11 ` [PATCH v1 1/5] " Peter Ujfalusi 2018-11-14 0:33 ` Mark Brown 2018-11-14 0:33 ` [v1,1/5] " Mark Brown 2018-11-14 8:45 ` [PATCH v1 1/5] " Andy Shevchenko 2018-11-14 8:45 ` [v1,1/5] " Andy Shevchenko 2018-11-14 8:45 ` [PATCH v1 1/5] " Andy Shevchenko 2018-11-14 10:19 ` Peter Ujfalusi 2018-11-14 10:19 ` [v1,1/5] " Peter Ujfalusi 2018-11-14 10:19 ` [PATCH v1 1/5] " Peter Ujfalusi
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