ata: libata: Add ata_force_get_fe_for_dev() helper

Add ata_force_get_fe_for_dev() helper to get the struct ata_force_ent for
a struct ata_device.

Use the helper in ata_force_quirks().
The helper will also be used in follow up commits.

No functional change intended.

Signed-off-by: Niklas Cassel <cassel@kernel.org>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>

Author: floatious

drivers/ata/libata-core.c

@@ -474,19 +474,10 @@ static void ata_force_xfermask(struct ata_device *dev)
 	}
 }
 
-/**
- *	ata_force_quirks - force quirks according to libata.force
- *	@dev: ATA device of interest
- *
- *	Force quirks according to libata.force and whine about it.
- *	For consistency with link selection, device number 15 selects
- *	the first device connected to the host link.
- *
- *	LOCKING:
- *	EH context.
- */
-static void ata_force_quirks(struct ata_device *dev)
+static const struct ata_force_ent *
+ata_force_get_fe_for_dev(struct ata_device *dev)
 {
+	const struct ata_force_ent *fe;
 	int devno = dev->link->pmp + dev->devno;
 	int alt_devno = devno;
 	int i;
@@ -496,25 +487,46 @@ static void ata_force_quirks(struct ata_device *dev)
 		alt_devno += 15;
 
 	for (i = 0; i < ata_force_tbl_size; i++) {
-		const struct ata_force_ent *fe = &ata_force_tbl[i];
-
+		fe = &ata_force_tbl[i];
 		if (fe->port != -1 && fe->port != dev->link->ap->print_id)
 			continue;
 
 		if (fe->device != -1 && fe->device != devno &&
 		    fe->device != alt_devno)
 			continue;
 
-		if (!(~dev->quirks & fe->param.quirk_on) &&
-		    !(dev->quirks & fe->param.quirk_off))
-			continue;
+		return fe;
+	}
 
-		dev->quirks |= fe->param.quirk_on;
-		dev->quirks &= ~fe->param.quirk_off;
+	return NULL;
+}
 
-		ata_dev_notice(dev, "FORCE: modified (%s)\n",
-			       fe->param.name);
-	}
+/**
+ *	ata_force_quirks - force quirks according to libata.force
+ *	@dev: ATA device of interest
+ *
+ *	Force quirks according to libata.force and whine about it.
+ *	For consistency with link selection, device number 15 selects
+ *	the first device connected to the host link.
+ *
+ *	LOCKING:
+ *	EH context.
+ */
+static void ata_force_quirks(struct ata_device *dev)
+{
+	const struct ata_force_ent *fe = ata_force_get_fe_for_dev(dev);
+
+	if (!fe)
+		return;
+
+	if (!(~dev->quirks & fe->param.quirk_on) &&
+	    !(dev->quirks & fe->param.quirk_off))
+		return;
+
+	dev->quirks |= fe->param.quirk_on;
+	dev->quirks &= ~fe->param.quirk_off;
+
+	ata_dev_notice(dev, "FORCE: modified (%s)\n", fe->param.name);
 }
 #else
 static inline void ata_force_pflags(struct ata_port *ap) { }