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xen, fbfront: mark expected switch fall-through

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In preparation to enabling -Wimplicit-fallthrough, mark switch
cases where we are expecting to fall through.

This patch fixes the following warning:

drivers/video/fbdev/xen-fbfront.c: In function ‘xenfb_backend_changed’:
drivers/video/fbdev/xen-fbfront.c:678:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
   if (dev->state == XenbusStateClosed)
      ^
drivers/video/fbdev/xen-fbfront.c:681:2: note: here
  case XenbusStateClosing:
  ^~~~

Warning level 3 was used: -Wimplicit-fallthrough=3

Notice that, in this particular case, the code comment is modified
in accordance with what GCC is expecting to find.

This patch is part of the ongoing efforts to enable
-Wimplicit-fallthrough.

Signed-off-by: Gustavo A. R. Silva <[email protected]>
Cc: Kees Cook <[email protected]>
Signed-off-by: Bartlomiej Zolnierkiewicz <[email protected]>
This commit is contained in:
Gustavo A. R. Silva 2019-04-01 17:46:57 +02:00 • committed by Bartlomiej Zolnierkiewicz
commit 17de805aa6
1 changed files with 1 additions and 1 deletions
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2
drivers/video/fbdev/xen-fbfront.c
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@ -677,7 +677,7 @@ static void xenfb_backend_changed(struct xenbus_device *dev,
case XenbusStateClosed:
if (dev->state == XenbusStateClosed)
break;
/* Missed the backend's CLOSING state -- fallthrough */
/* fall through - Missed the backend's CLOSING state. */
case XenbusStateClosing:
xenbus_frontend_closed(dev);
break;