linux-kernel - Re: [PATCH] mmc: block: ioctl: Poll for TRAN if possible

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Date:   Fri, 18 Jun 2021 10:00:40 +0000
From:   Christian Löhle <CLoehle@...erstone.com>
To:     Avri Altman <Avri.Altman@....com>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "ulf.hansson@...aro.org" <ulf.hansson@...aro.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        "shawn.lin@...k-chips.com" <shawn.lin@...k-chips.com>
Subject: Re: [PATCH] mmc: block: ioctl: Poll for TRAN if possible

>Poll for TRAN state if the ioctl command will eventually return to TRAN
>
>The ioctl submitted command should not be considered completed until
>the card has returned back to TRAN state. Waiting just for the card
>to no longer signal busy is not enough as they might remain in a
>non-busy PROG state for a while after the command.
>Further commands requiring TRAN will fail then.
>It should not be the responsibility of the user to check if their command
>has completed until sending the next via ioctl,
>instead the check should be made here.
>So now, in doubt, wait for TRAN except for the few commands that will
>never return to TRAN state.

So apart from the fact that I missed a couple of non-TRAN returning MMC
commands, which I will add in v2, are there any other thoughts about this
patch? It would change the behavior of the ioctl interface, but I think it is
the only way to prevent race conditions here.

Best Regards,
Christian

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