Re: [PATCH] scsi: core: Fix missing lock when read async_scan in Scsi_Host

[Bart Van Assche <bvanassche@acm.org>]

On 3/2/26 4:13 AM, Chaohai Chen wrote:
> +static bool scsi_test_async_scan(struct Scsi_Host *shost)
> +{
> +	bool async;
> +	unsigned long flags;
> +
> +	lockdep_assert_not_held(shost->host_lock);
> +
> +	spin_lock_irqsave(shost->host_lock, flags);
> +	async = shost->async_scan;
> +	spin_unlock_irqrestore(shost->host_lock, flags);
> +
> +	return async;
> +}

Please use scoped_guard(), e.g. as follows:

static bool scsi_scan_async(struct Scsi_Host *shost)
{
	scoped_guard(spinlock_irqsave, shost->host_lock)
		return shost->async_scan;
}

> +static void scsi_set_async_scan(struct Scsi_Host *shost)
> +{
> +	unsigned long flags;
> +
> +	lockdep_assert_not_held(shost->host_lock);
> +
> +	spin_lock_irqsave(shost->host_lock, flags);
> +	shost->async_scan = 1;
> +	spin_unlock_irqrestore(shost->host_lock, flags);
> +}
> +
> +static void scsi_clear_async_scan(struct Scsi_Host *shost)
> +{
> +	unsigned long flags;
> +
> +	lockdep_assert_not_held(shost->host_lock);
> +
> +	spin_lock_irqsave(shost->host_lock, flags);
> +	shost->async_scan = 0;
> +	spin_unlock_irqrestore(shost->host_lock, flags);
> +}
Please drop the scsi_set_async_scan() and scsi_clear_async_scan()
functions since these only have one caller.

Thanks,

Bart.