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

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Date:   Tue, 8 Jun 2021 11:22:11 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     Christian Löhle <CLoehle@...erstone.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.
Is this theoretical, or do you have an exact scenario in which the polling with cmd13 isn't enough?

Thanks,
Avri