ata: libata-acpi: kill ata_acpi_on_suspend()

Since the commit c05e6ff0 ("libata-acpi: implement
and use ata_acpi_init_gtm()") ata_acpi_on_suspend() just returns 0, so
its call from ata_eh_handle_port_suspend() doesn't make sense anymore.
Remove the function completely, at last...

Found by Linux Verification Center (linuxtesting.org) with the SVACE
static analysis tool.
Signed-off-by: Sergey Shtylyov <s.shtylyov@omp.ru>
Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>

drivers/ata/libata-acpi.c

@@ -799,27 +799,6 @@ static int ata_acpi_push_id(struct ata_device *dev)
 	return 0;
 }
 
-/**
- * ata_acpi_on_suspend - ATA ACPI hook called on suspend
- * @ap: target ATA port
- *
- * This function is called when @ap is about to be suspended.  All
- * devices are already put to sleep but the port_suspend() callback
- * hasn't been executed yet.  Error return from this function aborts
- * suspend.
- *
- * LOCKING:
- * EH context.
- *
- * RETURNS:
- * 0 on success, -errno on failure.
- */
-int ata_acpi_on_suspend(struct ata_port *ap)
-{
-	/* nada */
-	return 0;
-}
-
 /**
  * ata_acpi_on_resume - ATA ACPI hook called on resume
  * @ap: target ATA port

drivers/ata/libata-eh.c

@@ -3902,11 +3902,6 @@ static void ata_eh_handle_port_suspend(struct ata_port *ap)
 		}
 	}
 
-	/* tell ACPI we're suspending */
-	rc = ata_acpi_on_suspend(ap);
-	if (rc)
-		goto out;
-
 	/* suspend */
 	ata_eh_freeze_port(ap);
 
@@ -3914,7 +3909,7 @@ static void ata_eh_handle_port_suspend(struct ata_port *ap)
 		rc = ap->ops->port_suspend(ap, ap->pm_mesg);
 
 	ata_acpi_set_state(ap, ap->pm_mesg);
- out:
+
 	/* update the flags */
 	spin_lock_irqsave(ap->lock, flags);
 

drivers/ata/libata.h

@@ -107,7 +107,6 @@ static inline void ata_sas_free_tag(unsigned int tag, struct ata_port *ap) { }
 #ifdef CONFIG_ATA_ACPI
 extern unsigned int ata_acpi_gtf_filter;
 extern void ata_acpi_dissociate(struct ata_host *host);
-extern int ata_acpi_on_suspend(struct ata_port *ap);
 extern void ata_acpi_on_resume(struct ata_port *ap);
 extern int ata_acpi_on_devcfg(struct ata_device *dev);
 extern void ata_acpi_on_disable(struct ata_device *dev);
@@ -117,7 +116,6 @@ extern void ata_acpi_bind_dev(struct ata_device *dev);
 extern acpi_handle ata_dev_acpi_handle(struct ata_device *dev);
 #else
 static inline void ata_acpi_dissociate(struct ata_host *host) { }
-static inline int ata_acpi_on_suspend(struct ata_port *ap) { return 0; }
 static inline void ata_acpi_on_resume(struct ata_port *ap) { }
 static inline int ata_acpi_on_devcfg(struct ata_device *dev) { return 0; }
 static inline void ata_acpi_on_disable(struct ata_device *dev) { }