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Date:   Wed, 12 Aug 2020 13:06:06 -0700 (PDT)
From:   David Miller <>
Subject: Re: [PATCH net] sfc: fix ef100 design-param checking

From: Edward Cree <>
Date: Wed, 12 Aug 2020 10:32:49 +0100

> The handling of the RXQ/TXQ size granularity design-params had two
>  problems: it had a 64-bit divide that didn't build on 32-bit platforms,
>  and it could divide by zero if the NIC supplied 0 as the value of the
>  design-param.  Fix both by checking for 0 and for a granularity bigger
>  than our min-size; if the granularity <= EFX_MIN_DMAQ_SIZE then it fits
>  in 32 bits, so we can cast it to u32 for the divide.
> Reported-by: kernel test robot <>
> Signed-off-by: Edward Cree <>


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