linux-kernel - Re: [PATCH v2 2/2] scsi: libsas: Use bool for queue

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Message-ID: <d81c76bd-36aa-4885-1f36-1aec17ab5098@opensource.wdc.com>
Date:   Sun, 27 Feb 2022 12:59:57 +0900
From:   Damien Le Moal <damien.lemoal@...nsource.wdc.com>
To:     John Garry <john.garry@...wei.com>, jejb@...ux.ibm.com,
        martin.petersen@...cle.com
Cc:     chenxiang66@...ilicon.com, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org, linuxarm@...wei.com
Subject: Re: [PATCH v2 2/2] scsi: libsas: Use bool for queue_work() return
 code

On 2022/02/25 19:57, John Garry wrote:
> Function queue_work() returns a bool, so use a bool to hold this value
> for the return code from callers, which should make the code a tiny bit
> more clear.
> 
> Also take this opportunity to condense the code of the those callers, such
> as sas_queue_work(), as suggested by Damien.
> 
> Signed-off-by: John Garry <john.garry@...wei.com>

Looks good to me.

Reviewed-by: Damien Le Moal <damien.lemoal@...nsource.wdc.com>

> ---
>  drivers/scsi/libsas/sas_event.c    | 30 +++++++++++-------------------
>  drivers/scsi/libsas/sas_internal.h |  2 +-
>  2 files changed, 12 insertions(+), 20 deletions(-)
> 
> diff --git a/drivers/scsi/libsas/sas_event.c b/drivers/scsi/libsas/sas_event.c
> index 8ff58fd97837..f3a17191a4fe 100644
> --- a/drivers/scsi/libsas/sas_event.c
> +++ b/drivers/scsi/libsas/sas_event.c
> @@ -10,29 +10,26 @@
>  #include <scsi/scsi_host.h>
>  #include "sas_internal.h"
>  
> -int sas_queue_work(struct sas_ha_struct *ha, struct sas_work *sw)
> +bool sas_queue_work(struct sas_ha_struct *ha, struct sas_work *sw)
>  {
> -	/* it's added to the defer_q when draining so return succeed */
> -	int rc = 1;
> -
>  	if (!test_bit(SAS_HA_REGISTERED, &ha->state))
> -		return 0;
> +		return false;
>  
>  	if (test_bit(SAS_HA_DRAINING, &ha->state)) {
>  		/* add it to the defer list, if not already pending */
>  		if (list_empty(&sw->drain_node))
>  			list_add_tail(&sw->drain_node, &ha->defer_q);
> -	} else
> -		rc = queue_work(ha->event_q, &sw->work);
> +		return true;
> +	}
>  
> -	return rc;
> +	return queue_work(ha->event_q, &sw->work);
>  }
>  
> -static int sas_queue_event(int event, struct sas_work *work,
> +static bool sas_queue_event(int event, struct sas_work *work,
>  			    struct sas_ha_struct *ha)
>  {
>  	unsigned long flags;
> -	int rc;
> +	bool rc;
>  
>  	spin_lock_irqsave(&ha->lock, flags);
>  	rc = sas_queue_work(ha, work);
> @@ -44,13 +41,12 @@ static int sas_queue_event(int event, struct sas_work *work,
>  void sas_queue_deferred_work(struct sas_ha_struct *ha)
>  {
>  	struct sas_work *sw, *_sw;
> -	int ret;
>  
>  	spin_lock_irq(&ha->lock);
>  	list_for_each_entry_safe(sw, _sw, &ha->defer_q, drain_node) {
>  		list_del_init(&sw->drain_node);
> -		ret = sas_queue_work(ha, sw);
> -		if (ret != 1) {
> +
> +		if (!sas_queue_work(ha, sw)) {
>  			pm_runtime_put(ha->dev);
>  			sas_free_event(to_asd_sas_event(&sw->work));
>  		}
> @@ -170,7 +166,6 @@ void sas_notify_port_event(struct asd_sas_phy *phy, enum port_event event,
>  {
>  	struct sas_ha_struct *ha = phy->ha;
>  	struct asd_sas_event *ev;
> -	int ret;
>  
>  	BUG_ON(event >= PORT_NUM_EVENTS);
>  
> @@ -186,8 +181,7 @@ void sas_notify_port_event(struct asd_sas_phy *phy, enum port_event event,
>  	if (sas_defer_event(phy, ev))
>  		return;
>  
> -	ret = sas_queue_event(event, &ev->work, ha);
> -	if (ret != 1) {
> +	if (!sas_queue_event(event, &ev->work, ha)) {
>  		pm_runtime_put(ha->dev);
>  		sas_free_event(ev);
>  	}
> @@ -199,7 +193,6 @@ void sas_notify_phy_event(struct asd_sas_phy *phy, enum phy_event event,
>  {
>  	struct sas_ha_struct *ha = phy->ha;
>  	struct asd_sas_event *ev;
> -	int ret;
>  
>  	BUG_ON(event >= PHY_NUM_EVENTS);
>  
> @@ -215,8 +208,7 @@ void sas_notify_phy_event(struct asd_sas_phy *phy, enum phy_event event,
>  	if (sas_defer_event(phy, ev))
>  		return;
>  
> -	ret = sas_queue_event(event, &ev->work, ha);
> -	if (ret != 1) {
> +	if (!sas_queue_event(event, &ev->work, ha)) {
>  		pm_runtime_put(ha->dev);
>  		sas_free_event(ev);
>  	}
> diff --git a/drivers/scsi/libsas/sas_internal.h b/drivers/scsi/libsas/sas_internal.h
> index 24843db2cb65..13d0ffaada93 100644
> --- a/drivers/scsi/libsas/sas_internal.h
> +++ b/drivers/scsi/libsas/sas_internal.h
> @@ -67,7 +67,7 @@ void sas_porte_broadcast_rcvd(struct work_struct *work);
>  void sas_porte_link_reset_err(struct work_struct *work);
>  void sas_porte_timer_event(struct work_struct *work);
>  void sas_porte_hard_reset(struct work_struct *work);
> -int sas_queue_work(struct sas_ha_struct *ha, struct sas_work *sw);
> +bool sas_queue_work(struct sas_ha_struct *ha, struct sas_work *sw);
>  
>  int sas_notify_lldd_dev_found(struct domain_device *);
>  void sas_notify_lldd_dev_gone(struct domain_device *);


-- 
Damien Le Moal
Western Digital Research