Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Date:   Sat, 2 May 2020 20:08:06 +0200
From:   Miquel Raynal <miquel.raynal@bootlin.com>
To:     Kamal Dasu <kamal.dasu@broadcom.com>
Cc:     Vignesh Raghavendra <vigneshr@ti.com>,
        Kamal Dasu <kdasu.kdev@gmail.com>,
        Richard Weinberger <richard@nod.at>,
        linux-kernel <linux-kernel@vger.kernel.org>,
        Marek Vasut <marek.vasut@gmail.com>,
        bcm-kernel-feedback-list <bcm-kernel-feedback-list@broadcom.com>,
        linux-mtd <linux-mtd@lists.infradead.org>,
        Brian Norris <computersforpeace@gmail.com>,
        David Woodhouse <dwmw2@infradead.org>
Subject: Re: [PATCH] mtd: set mtd partition panic write flag
Message-ID: <20200502200806.1d6b1cba@xps13>
In-Reply-To: <20200109182807.04c8866a@xps13>
References: <20191021193343.41320-1-kdasu.kdev@gmail.com>
        <20191105200344.1e8c3eab@xps13>
        <1718371158.75883.1572995022606.JavaMail.zimbra@nod.at>
        <20200109160352.6080e1e5@xps13>
        <CAKekbeucdjZgttQfHeiXH6S92He2qkKGsQcEqz_4_okHzDK16A@mail.gmail.com>
        <20200109182807.04c8866a@xps13>
Organization: Bootlin
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8BIT
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Hi Kamal,

Miquel Raynal <miquel.raynal@bootlin.com> wrote on Thu, 9 Jan 2020
18:28:07 +0100:

> Hi Kamal,
> 
> Kamal Dasu <kamal.dasu@broadcom.com> wrote on Thu, 9 Jan 2020 10:25:59
> -0500:
> 
> > Miquel,
> > 
> > Yes the issue is still open. I was trying to understand the suggestion
> > and did not get a reply on the question I had
> > 
> > Richard wrote :
> > "So the right fix would be setting the parent's oops_panic_write in
> > mtd_panic_write().
> > Then we don't have to touch mtdpart.c"
> > 
> > How do I get access to the parts parent in the core ?. Maybe I am
> > missing something.  
> 
> I think the solution is to set the oops_panic_write of the root parent, instead of updating the flag of the mtd device itself (which is maybe a partition).
> 
> Would this help?
> 
> https://www.spinics.net/lists/linux-mtd/msg10454.html

I'm pinging you here as well, as I think you raise a real issue, and we
agreed on a solution, which can now be easily setup with the above
change which has been applied and support for functions like:

	static inline struct mtd_info *mtd_get_master(struct mtd_info *mtd)
	static inline u64 mtd_get_master_ofs(struct mtd_info *mtd, u64 ofs)
	static inline bool mtd_is_partition(const struct mtd_info *mtd)
	static inline bool mtd_has_partitions(const struct mtd_info *mtd)

Thanks,
Miquèl