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

[Sverdlin, Alexander]

Hi Christophe,

On Mon, 2025-11-03 at 22:46 +0100, Christophe Leroy wrote:
> > > > 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 ?
> > 
> > could you share these "random Oops"?
> 
> Sure. At the first place they look unrelated. Something is likely 

indeed, no obvious connection... Do you have a chance to run KASAN?

> writing in the weed.

-- 
Alexander Sverdlin
Siemens AG
www.siemens.com