scsi: libsas: Refactor sas_ata_hard_reset()

Create function sas_ata_wait_after_reset() from sas_ata_hard_reset() as
some LLDDs may want to check for a remote ATA phy is up after reset.

Link: https://lore.kernel.org/r/1652354134-171343-2-git-send-email-john.garry@huawei.com
Tested-by: Yihang Li <liyihang6@hisilicon.com>
Reviewed-by: Xiang Chen <chenxiang66@hisilicon.com>
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/libsas/sas_ata.c

@@ -358,22 +358,14 @@ static int sas_ata_printk(const char *level, const struct domain_device *ddev,
 	return r;
 }
 
-static int sas_ata_hard_reset(struct ata_link *link, unsigned int *class,
-			      unsigned long deadline)
+int sas_ata_wait_after_reset(struct domain_device *dev, unsigned long deadline)
 {
-	int ret = 0, res;
-	struct sas_phy *phy;
-	struct ata_port *ap = link->ap;
+	struct sata_device *sata_dev = &dev->sata_dev;
 	int (*check_ready)(struct ata_link *link);
-	struct domain_device *dev = ap->private_data;
-	struct sas_internal *i = dev_to_sas_internal(dev);
-
-	res = i->dft->lldd_I_T_nexus_reset(dev);
-	if (res == -ENODEV)
-		return res;
-
-	if (res != TMF_RESP_FUNC_COMPLETE)
-		sas_ata_printk(KERN_DEBUG, dev, "Unable to reset ata device?\n");
+	struct ata_port *ap = sata_dev->ap;
+	struct ata_link *link = &ap->link;
+	struct sas_phy *phy;
+	int ret;
 
 	phy = sas_get_local_phy(dev);
 	if (scsi_is_sas_phy_local(phy))
@@ -386,6 +378,27 @@ static int sas_ata_hard_reset(struct ata_link *link, unsigned int *class,
 	if (ret && ret != -EAGAIN)
 		sas_ata_printk(KERN_ERR, dev, "reset failed (errno=%d)\n", ret);
 
+	return ret;
+}
+EXPORT_SYMBOL_GPL(sas_ata_wait_after_reset);
+
+static int sas_ata_hard_reset(struct ata_link *link, unsigned int *class,
+			      unsigned long deadline)
+{
+	struct ata_port *ap = link->ap;
+	struct domain_device *dev = ap->private_data;
+	struct sas_internal *i = dev_to_sas_internal(dev);
+	int ret;
+
+	ret = i->dft->lldd_I_T_nexus_reset(dev);
+	if (ret == -ENODEV)
+		return ret;
+
+	if (ret != TMF_RESP_FUNC_COMPLETE)
+		sas_ata_printk(KERN_DEBUG, dev, "Unable to reset ata device?\n");
+
+	ret = sas_ata_wait_after_reset(dev, deadline);
+
 	*class = dev->sata_dev.class;
 
 	ap->cbl = ATA_CBL_SATA;

include/scsi/sas_ata.h

@@ -34,6 +34,7 @@ void sas_resume_sata(struct asd_sas_port *port);
 void sas_ata_end_eh(struct ata_port *ap);
 int sas_execute_ata_cmd(struct domain_device *device, u8 *fis,
 			int force_phy_id);
+int sas_ata_wait_after_reset(struct domain_device *dev, unsigned long deadline);
 #else
 
 
@@ -91,6 +92,12 @@ static inline int sas_execute_ata_cmd(struct domain_device *device, u8 *fis,
 {
 	return 0;
 }
+
+static inline int sas_ata_wait_after_reset(struct domain_device *dev,
+					   unsigned long deadline)
+{
+	return -ETIMEDOUT;
+}
 #endif
 
 #endif /* _SAS_ATA_H_ */