From: Greg KH <gregkh@linuxfoundation.org>
To: Roman Kiryanov <rkir@google.com>
Cc: linux-kernel@vger.kernel.org, Todd Kjos <tkjos@google.com>
Subject: Re: [PATCH v3 06/15] platform: goldfish: pipe: Move memory allocation from probe to init
Date: Mon, 15 Oct 2018 20:56:11 +0200 [thread overview]
Message-ID: <20181015185611.GA5201@kroah.com> (raw)
In-Reply-To: <CAOGAQerzTxLEcFjqCqjGvFDaK79LWw7kuGqprw4mEj6gmcm6tA@mail.gmail.com>
On Mon, Oct 15, 2018 at 11:48:28AM -0700, Roman Kiryanov wrote:
> > You should only allocate memory at probe time
>
> probe does not know what memory to allocate. We have several versions
> of the driver (with different init) and different versions allocate
> different state.
I only see one driver here.
Why does probe not know what to allocate? That is exactly when the
device is bound to the driver, you have _way_ more information than you
do at init time.
> >, not init time as what
> > happens if the hardware is not present yet your driver is loaded?
>
> init will have to rollback what it allocated.
But those resources it will sit there wasted until unload happens. And
unload _never_ happens on a system unless you are a developer working on
the module.
thanks,
greg k-h
next prev parent reply other threads:[~2018-10-15 18:56 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-03 17:17 [PATCH v3 01/15] platform: goldfish: pipe: Move the file-scope goldfish_interrupt_tasklet variable into the driver state rkir
2018-10-03 17:17 ` [PATCH v3 02/15] platform: goldfish: pipe: Move the file-scope goldfish_pipe_miscdev " rkir
2018-10-03 17:17 ` [PATCH v3 03/15] platform: goldfish: pipe: Move the file-scope goldfish_pipe_dev " rkir
2018-10-03 17:17 ` [PATCH v3 04/15] platform: goldfish: pipe: Call misc_deregister if init fails rkir
2018-10-03 17:17 ` [PATCH v3 05/15] platform: goldfish: pipe: Remove redundant casting rkir
2018-10-03 17:17 ` [PATCH v3 06/15] platform: goldfish: pipe: Move memory allocation from probe to init rkir
2018-10-15 18:34 ` Greg KH
2018-10-15 18:48 ` Roman Kiryanov
2018-10-15 18:56 ` Greg KH [this message]
2018-10-15 19:06 ` Roman Kiryanov
2018-10-16 6:27 ` Greg KH
2018-10-16 20:48 ` Roman Kiryanov
2018-10-03 17:17 ` [PATCH v3 07/15] platform: goldfish: pipe: Return status from "deinit" since "remove" does not do much rkir
2018-10-15 18:36 ` Greg KH
2018-10-15 22:04 ` Roman Kiryanov
2018-10-16 6:30 ` Greg KH
2018-10-03 17:17 ` [PATCH v3 08/15] platform: goldfish: pipe: Add a blank line to separate varibles and code rkir
2018-10-03 17:17 ` [PATCH v3 09/15] platform: goldfish: pipe: Move goldfish_pipe to goldfish_pipe_v2 rkir
2018-10-15 18:38 ` Greg KH
2018-10-15 18:55 ` Roman Kiryanov
2018-10-15 19:01 ` Greg KH
2018-10-15 20:23 ` Roman Kiryanov
2018-10-16 6:29 ` Greg KH
2018-10-16 21:02 ` Roman Kiryanov
2018-10-03 17:17 ` [PATCH v3 10/15] platform: goldfish: pipe: Remove the license boilerplate rkir
2018-10-03 17:17 ` [PATCH v3 11/15] platform: goldfish: pipe: Split the driver to v2 specific and the rest rkir
2018-10-03 17:17 ` [PATCH v3 12/15] platform: goldfish: pipe: Rename the init function (add "v2") rkir
2018-10-03 17:17 ` [PATCH v3 13/15] platform: goldfish: pipe: Add a dedicated constant for the device name rkir
2018-10-03 17:17 ` [PATCH v3 14/15] platform: goldfish: pipe: Rename PIPE_REG to PIPE_V2_REG rkir
2018-10-03 17:17 ` [PATCH v3 15/15] platform: goldfish: pipe: Add the goldfish_pipe_v1 driver rkir
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