linux-kernel - Re: [PATCH] eeprom: at25: convert to spi-mem API

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Message-ID: <2025110513-manliness-repayment-d005@gregkh>
Date: Wed, 5 Nov 2025 08:15:39 +0900
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Christophe Leroy <christophe.leroy@...roup.eu>
Cc: "A. Sverdlin" <alexander.sverdlin@...mens.com>,
	linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
	Michael Walle <mwalle@...nel.org>,
	Hui Wang <hui.wang@...onical.com>,
	TRINH THAI Florent <florent.trinh-thai@...soprasteria.com>
Subject: Re: [PATCH] eeprom: at25: convert to spi-mem API

On Mon, Nov 03, 2025 at 05:33:34PM +0100, Christophe Leroy wrote:
> Hi,
> 
> Le 03/07/2025 à 00:28, A. Sverdlin a écrit :
> > From: Alexander Sverdlin <alexander.sverdlin@...mens.com>
> > 
> > Replace the RAW SPI accesses with spi-mem API. The latter will fall back to
> > RAW SPI accesses if spi-mem callbacks are not implemented by a controller
> > driver.
> 
> With this patch (kernel v6.17.1) our powerpc boards are totally unstable, we
> get multiple random Oops due to bad memory accesses.
> 
> With this commit reverted the board is stable again.
> 
> The SPI driver is:
> 
> CONFIG_SPI=y
> CONFIG_SPI_MASTER=y
> CONFIG_SPI_MEM=y
> CONFIG_SPI_FSL_LIB=y
> CONFIG_SPI_FSL_CPM=y
> CONFIG_SPI_FSL_SPI=y
> 
> How can we further investigate the issue ?

We can revert it until it comes back working properly.  Can you send a
revert so that I can apply it?

thanks,

greg k-h