linux-kernel - Re: [PATCH 2/3] mwifiex: support sysfs initiated device coredump

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Message-ID: <20180221225903.GA42395@rodete-desktop-imager.corp.google.com>
Date:   Wed, 21 Feb 2018 14:59:05 -0800
From:   Brian Norris <briannorris@...omium.org>
To:     Arend van Spriel <arend.vanspriel@...adcom.com>
Cc:     Kalle Valo <kvalo@...eaurora.org>,
        Marcel Holtmann <marcel@...tmann.org>,
        linux-wireless@...r.kernel.org, linux-bluetooth@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 2/3] mwifiex: support sysfs initiated device coredump

On Wed, Feb 21, 2018 at 11:50:19AM +0100, Arend van Spriel wrote:
> Since commit 3c47d19ff4dc ("drivers: base: add coredump driver ops")
> it is possible to initiate a device coredump from user-space. This
> patch adds support for it adding the .coredump() driver callback.
> As there is no longer a need to initiate it through debugfs remove
> that code.
> 
> Signed-off-by: Arend van Spriel <arend.vanspriel@...adcom.com>
> ---
>  drivers/net/wireless/marvell/mwifiex/debugfs.c | 31 +-------------------------
>  drivers/net/wireless/marvell/mwifiex/pcie.c    | 19 ++++++++++++++--
>  drivers/net/wireless/marvell/mwifiex/sdio.c    | 13 +++++++++++
>  drivers/net/wireless/marvell/mwifiex/usb.c     | 14 ++++++++++++
>  4 files changed, 45 insertions(+), 32 deletions(-)

The documentation doesn't really say [1], but is the coredump supposed
to happen synchronously? Because the mwifiex implementation is
asynchronous, whereas it looks like the brcmfmac one is synchronous.

Brian

[1] In fact, the ABI documentation really just describes kernel
internals, rather than documenting any user-facing details, from what I
can tell.