scsi: aic94xx: Fix fall-through warning for Clang

In preparation to enable -Wimplicit-fallthrough for Clang, fix a
warning by explicitly adding a fallthrough; statement.

Notice that this seems to be a Duff device for performance[1]. So,
although the code looks a bit _funny_, I didn't want to refactor
or modify it beyond merely adding a fallthrough marking, which
might be the least disruptive way to fix this issue.

[1] https://www.drdobbs.com/a-reusable-duff-device/184406208

Link: https://github.com/KSPP/linux/issues/115
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>

diff --git a/drivers/scsi/aic94xx/aic94xx_sds.c b/drivers/scsi/aic94xx/aic94xx_sds.c
index 297a66770260ccfb6973d5c926ac8ee5bbb6d0de..46815e65f7a45a7616623aed4844f8156ddb3f1f 100644 (file)
--- a/drivers/scsi/aic94xx/aic94xx_sds.c
+++ b/drivers/scsi/aic94xx/aic94xx_sds.c
@@ -718,10 +718,12 @@ static void *asd_find_ll_by_id(void * const start, const u8 id0, const u8 id1)
        do {
                switch (id1) {
                default:
-                       if (el->id1 == id1)
+                       if (el->id1 == id1) {
+                       fallthrough;
                case 0xFF:
                                if (el->id0 == id0)
                                        return el;
+                       }
                }
                el = start + le16_to_cpu(el->next);
        } while (el != start);