linux-kernel - Re: [PATCH v3 2/2] mtd: nand: raw: brcmnand: When oops in progress use pio and interrupt polling

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Message-ID: <CAFLxGvyZCpKthJevFHjjBQXo=j5f-FUip0MAsLy0HaoJzLZ2rA@mail.gmail.com>
Date:   Fri, 17 May 2019 10:12:21 +0200
From:   Richard Weinberger <richard.weinberger@...il.com>
To:     Kamal Dasu <kdasu.kdev@...il.com>
Cc:     linux-mtd@...ts.infradead.org,
        Vignesh Raghavendra <vigneshr@...com>,
        Richard Weinberger <richard@....at>,
        LKML <linux-kernel@...r.kernel.org>,
        Marek Vasut <marek.vasut@...il.com>,
        bcm-kernel-feedback-list@...adcom.com,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Brian Norris <computersforpeace@...il.com>,
        David Woodhouse <dwmw2@...radead.org>
Subject: Re: [PATCH v3 2/2] mtd: nand: raw: brcmnand: When oops in progress
 use pio and interrupt polling

On Thu, May 16, 2019 at 6:42 PM Kamal Dasu <kdasu.kdev@...il.com> wrote:
>
> If mtd_oops is in progress, switch to polling during NAND command
> completion instead of relying on DMA/interrupts so that the mtd_oops
> buffer can be completely written in the assigned NAND partition.

With the new flag the semantics change, as soon a panic write happened,
the flag will stay and *all* future operates will take the polling/pio path.

IMHO this is fine since the kernel cannot recover from an oops.
But just to make sure we all get this. :-)
An alternative would be to block all further non-panic writes.

-- 
Thanks,
//richard