[PATCH] scsi: core: Make scsi_lib KUnit tests modular for real

[Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>]

While SCSI_LIB_KUNIT_TEST is a tristate config symbol, configuring a
modular build of this test does not do anything: as the test code is
just included by the mid layer code, it only works in the built-in case.

Fix this by converting the test to a stand-alone module.  This requires
exporting scsi_check_passthrough() and adding a MODULE_LICENSE() tag.

Fixes: 25a1f7a0a1fe6fa6 ("scsi: core: Add kunit tests for scsi_check_passthrough()")
Signed-off-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
---
 drivers/scsi/Makefile        | 1 +
 drivers/scsi/scsi_lib.c      | 9 +++------
 drivers/scsi/scsi_lib_test.c | 4 ++++
 drivers/scsi/scsi_priv.h     | 2 ++
 4 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/scsi/Makefile b/drivers/scsi/Makefile
index f055bfd54a6832b3..396a24aa43486678 100644
--- a/drivers/scsi/Makefile
+++ b/drivers/scsi/Makefile
@@ -149,6 +149,7 @@ obj-$(CONFIG_BLK_DEV_SR)	+= sr_mod.o
 obj-$(CONFIG_CHR_DEV_SG)	+= sg.o
 obj-$(CONFIG_CHR_DEV_SCH)	+= ch.o
 obj-$(CONFIG_SCSI_ENCLOSURE)	+= ses.o
+obj-$(CONFIG_SCSI_LIB_KUNIT_TEST) += scsi_lib_test.o
 
 obj-$(CONFIG_SCSI_HISI_SAS) += hisi_sas/
 
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 2e28e2360c85740d..23e94e9bf85781a9 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -203,8 +203,8 @@ EXPORT_SYMBOL_GPL(scsi_failures_reset_retries);
  *
  * Returns -EAGAIN if the caller should retry else 0.
  */
-static int scsi_check_passthrough(struct scsi_cmnd *scmd,
-				  struct scsi_failures *failures)
+int scsi_check_passthrough(struct scsi_cmnd *scmd,
+			   struct scsi_failures *failures)
 {
 	struct scsi_failure *failure;
 	struct scsi_sense_hdr sshdr;
@@ -269,6 +269,7 @@ static int scsi_check_passthrough(struct scsi_cmnd *scmd,
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(scsi_check_passthrough);
 
 /**
  * scsi_execute_cmd - insert request and wait for the result
@@ -3436,7 +3437,3 @@ void scsi_build_sense(struct scsi_cmnd *scmd, int desc, u8 key, u8 asc, u8 ascq)
 	scmd->result = SAM_STAT_CHECK_CONDITION;
 }
 EXPORT_SYMBOL_GPL(scsi_build_sense);
-
-#ifdef CONFIG_SCSI_LIB_KUNIT_TEST
-#include "scsi_lib_test.c"
-#endif
diff --git a/drivers/scsi/scsi_lib_test.c b/drivers/scsi/scsi_lib_test.c
index 99834426a100a754..13045ac12fa99d24 100644
--- a/drivers/scsi/scsi_lib_test.c
+++ b/drivers/scsi/scsi_lib_test.c
@@ -10,6 +10,8 @@
 #include <scsi/scsi_cmnd.h>
 #include <scsi/scsi_device.h>
 
+#include "scsi_priv.h"
+
 #define SCSI_LIB_TEST_MAX_ALLOWED 3
 #define SCSI_LIB_TEST_TOTAL_MAX_ALLOWED 5
 
@@ -328,3 +330,5 @@ static struct kunit_suite scsi_lib_test_suite = {
 };
 
 kunit_test_suite(scsi_lib_test_suite);
+
+MODULE_LICENSE("GPL");
diff --git a/drivers/scsi/scsi_priv.h b/drivers/scsi/scsi_priv.h
index 9fc397a9ce7a4f91..7f7e55341192e50e 100644
--- a/drivers/scsi/scsi_priv.h
+++ b/drivers/scsi/scsi_priv.h
@@ -113,6 +113,8 @@ extern int scsi_mq_setup_tags(struct Scsi_Host *shost);
 extern void scsi_mq_free_tags(struct kref *kref);
 extern void scsi_exit_queue(void);
 extern void scsi_evt_thread(struct work_struct *work);
+extern int scsi_check_passthrough(struct scsi_cmnd *scmd,
+				  struct scsi_failures *failures);
 
 /* scsi_proc.c */
 #ifdef CONFIG_SCSI_PROC_FS
-- 
2.34.1