[PATCH] mtd: spi-nor: Unprepare legacy controllers upon RWW wait interruption

[Tudor Ambarus]

On 8/11/26 6:56 PM, Miquel Raynal wrote:
> All the parallel locking helpers (spi_nor_prep_and_lock(),
> spi_nor_prep_and_lock_pe() and spi_nor_prep_and_lock_rd()) call
> spi_nor_prep() then wait with a killable sleep. If the sleep gets
> killed, we leave the controller in its prepared state.
> 
> Call ->unprepare() in these cases.


We don't even care about SPI NOR controllers. I stopped adding/accepting
new support for them few years ago, so that we encourage people to update
the drivers to use SPI MEM.

The alternative is to drop prep unprep entirely.

Anyway, all good, regardless the path chosen:

Acked-by: Tudor Ambarus <tudor.ambarus at linaro.org>
> 
> Fixes: 74df43b3f626 ("mtd: spi-nor: Enhance locking to support reads while writes")
> Cc: stable at vger.kernel.org
> Signed-off-by: Miquel Raynal <miquel.raynal at bootlin.com>
> ---
>  drivers/mtd/spi-nor/core.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
> index 8bc117b46e02..250e996284f9 100644
> --- a/drivers/mtd/spi-nor/core.c
> +++ b/drivers/mtd/spi-nor/core.c
> @@ -1346,6 +1346,9 @@ int spi_nor_prep_and_lock(struct spi_nor *nor)
>  		ret = wait_event_killable(nor->rww.wait,
>  					  spi_nor_rww_start_exclusive(nor));
>  
> +	if (ret)
> +		spi_nor_unprep(nor);
> +
>  	return ret;
>  }
>  
> @@ -1417,6 +1420,9 @@ static int spi_nor_prep_and_lock_pe(struct spi_nor *nor, loff_t start, size_t le
>  		ret = wait_event_killable(nor->rww.wait,
>  					  spi_nor_rww_start_pe(nor, start, len));
>  
> +	if (ret)
> +		spi_nor_unprep(nor);
> +
>  	return ret;
>  }
>  
> @@ -1490,6 +1496,9 @@ static int spi_nor_prep_and_lock_rd(struct spi_nor *nor, loff_t start, size_t le
>  		ret = wait_event_killable(nor->rww.wait,
>  					  spi_nor_rww_start_rd(nor, start, len));
>  
> +	if (ret)
> +		spi_nor_unprep(nor);
> +
>  	return ret;
>  }
>  
> 
> ---
> base-commit: db5f6418501f9795a96026b764d747179a231b2b
> change-id: 20260811-perso-rww-fixes-016cdd229647
> 
> Best regards,