linux-kernel - Re: [PATCH 088/190] Revert "mmc_spi: add a status check for spi_sync

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Date:   Wed, 21 Apr 2021 16:19:07 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, Kangjie Lu <kjlu@....edu>,
        Ulf Hansson <ulf.hansson@...aro.org>
Subject: Re: [PATCH 088/190] Revert "mmc_spi: add a status check for
 spi_sync_locked"

Hi Greg,

Thank you for the patch.

On Wed, Apr 21, 2021 at 02:59:23PM +0200, Greg Kroah-Hartman wrote:
> This reverts commit 611025983b7976df0183390a63a2166411d177f1.
> 
> Commits from @umn.edu addresses have been found to be submitted in "bad
> faith" to try to test the kernel community's ability to review "known
> malicious" changes.  The result of these submissions can be found in a
> paper published at the 42nd IEEE Symposium on Security and Privacy
> entitled, "Open Source Insecurity: Stealthily Introducing
> Vulnerabilities via Hypocrite Commits" written by Qiushi Wu (University
> of Minnesota) and Kangjie Lu (University of Minnesota).
> 
> Because of this, all submissions from this group must be reverted from
> the kernel tree and will need to be re-reviewed again to determine if
> they actually are a valid fix.  Until that work is complete, remove this
> change to ensure that no problems are being introduced into the
> codebase.
> 
> Cc: Kangjie Lu <kjlu@....edu>
> Cc: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> Cc: Ulf Hansson <ulf.hansson@...aro.org>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

Acked-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

I don't spot an obvious issue with the original patch though.

> ---
>  drivers/mmc/host/mmc_spi.c | 4 ----
>  1 file changed, 4 deletions(-)
> 
> diff --git a/drivers/mmc/host/mmc_spi.c b/drivers/mmc/host/mmc_spi.c
> index 02f4fd26e76a..cc40b050e302 100644
> --- a/drivers/mmc/host/mmc_spi.c
> +++ b/drivers/mmc/host/mmc_spi.c
> @@ -800,10 +800,6 @@ mmc_spi_readblock(struct mmc_spi_host *host, struct spi_transfer *t,
>  	}
>  
>  	status = spi_sync_locked(spi, &host->m);
> -	if (status < 0) {
> -		dev_dbg(&spi->dev, "read error %d\n", status);
> -		return status;
> -	}
>  
>  	if (host->dma_dev) {
>  		dma_sync_single_for_cpu(host->dma_dev,

-- 
Regards,

Laurent Pinchart