linux-kernel - Re: [RFC PATCH] crypto: flush poison data

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Date:   Tue, 5 Jul 2022 18:42:13 +0200
From:   Christoph Hellwig <hch@....de>
To:     LABBE Corentin <clabbe@...libre.com>
Cc:     Ben Dooks <ben.dooks@...ethink.co.uk>, herbert@...dor.apana.org.au,
        hch@....de, heiko@...ech.de, linux-crypto@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-sunxi@...ts.linux.dev
Subject: Re: [RFC PATCH] crypto: flush poison data

On Tue, Jul 05, 2022 at 10:21:13AM +0200, LABBE Corentin wrote:
> 
> I just copied what did drivers/crypto/xilinx/zynqmp-sha.c.
> I tried to do flush_dcache_range() but it seems to not be implemented on riscV.

That driver is broken and should no have been merged in that form.

> And flush_dcache_page(virt_to_page(addr), len) produce a kernel panic.

And that's good so.  Drivers have no business doing their own cache
flushing.  That is the job of the dma-mapping implementation, so I'd
suggest to look for problems there.