Re: [PATCH] scsi: sd: fix error handling for sd_large_pool_create() call failure

[Damien Le Moal <dlemoal@kernel.org>]

On 7/7/26 19:55, John Garry wrote:
> If the sd_probe() -> sd_large_pool_create() call fails, then we incorrectly
> unwind the probe actions.
> 
> Currently for the sd_large_pool_create() failure we do no undo the
> device_add() call.
> 
> Fix this by mimicking the handling of device_add_disk() failure, in calling
> device_unregister() and put_disk(). The device_unregister() call will
> result in scsi_disk_release() being called, which unwinds many actions in
> sd_probe().
> 
> Fixes: 7179e626b76e ("scsi: sd: Enable sector size > PAGE_SIZE in SCSI sd driver")
> Signed-off-by: John Garry <john.g.garry@oracle.com>

Xiuwei posted a series fixing this already:

https://lore.kernel.org/all/20260707030333.22245-1-yangxiuwei@kylinos.cn/

> ---
> I do wonder if it is simpler to always create this pool when we can
> support LBS. We only create a min of two elements in the pool, so
> hardly large.
> 
> diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
> index 599e75f33334..d18693d390b2 100644
> --- a/drivers/scsi/sd.c
> +++ b/drivers/scsi/sd.c
> @@ -4089,7 +4089,9 @@ static int sd_probe(struct scsi_device *sdp)
>  	if (sdp->sector_size > PAGE_SIZE) {
>  		if (sd_large_pool_create()) {
>  			error = -ENOMEM;
> -			goto out_free_index;
> +			device_unregister(&sdkp->disk_dev);
> +			put_disk(gd);
> +			goto out;
>  		}
>  	}
>  


-- 
Damien Le Moal
Western Digital Research