acpi, nfit: fix extended status translations for ACPI DSMs

ACPI DSMs can have an 'extended' status which can be non-zero to convey
additional information about the command. In the xlat_status routine,
where we translate the command statuses, we were returning an error for
a non-zero extended status, even if the primary status indicated success.

Return from each command's 'case' once we have verified both its status
and extend status are good.

Cc: <stable@vger.kernel.org>
Fixes: 11294d6 ("nfit: fail DSMs that return non-zero status by default")
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

Author: stellarhopper

drivers/acpi/nfit/core.c

@@ -113,7 +113,7 @@ static int xlat_status(void *buf, unsigned int cmd, u32 status)
 		flags = ND_ARS_PERSISTENT | ND_ARS_VOLATILE;
 		if ((status >> 16 & flags) == 0)
 			return -ENOTTY;
-		break;
+		return 0;
 	case ND_CMD_ARS_START:
 		/* ARS is in progress */
 		if ((status & 0xffff) == NFIT_ARS_START_BUSY)
@@ -122,7 +122,7 @@ static int xlat_status(void *buf, unsigned int cmd, u32 status)
 		/* Command failed */
 		if (status & 0xffff)
 			return -EIO;
-		break;
+		return 0;
 	case ND_CMD_ARS_STATUS:
 		ars_status = buf;
 		/* Command failed */
@@ -154,7 +154,7 @@ static int xlat_status(void *buf, unsigned int cmd, u32 status)
 		/* Unknown status */
 		if (status >> 16)
 			return -EIO;
-		break;
+		return 0;
 	case ND_CMD_CLEAR_ERROR:
 		clear_err = buf;
 		if (status & 0xffff)
@@ -163,7 +163,7 @@ static int xlat_status(void *buf, unsigned int cmd, u32 status)
 			return -EIO;
 		if (clear_err->length > clear_err->cleared)
 			return clear_err->cleared;
-		break;
+		return 0;
 	default:
 		break;
 	}