linux-kernel - [PATCH] PCI: Mark expected switch fall-through

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Date:   Thu, 1 Aug 2019 20:22:48 -0500
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Bjorn Helgaas <bhelgaas@...gle.com>
Cc:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Kees Cook <keescook@...omium.org>
Subject: [PATCH] PCI: Mark expected switch fall-through

Mark switch cases where we are expecting to fall through.

This patch fixes the following warning (Building: allmodconfig i386):

drivers/pci/hotplug/ibmphp_res.c: In function ‘update_bridge_ranges’:
drivers/pci/hotplug/ibmphp_res.c:1943:16: warning: this statement may fall through [-Wimplicit-fallthrough=]
       function = 0x8;
       ~~~~~~~~~^~~~~
drivers/pci/hotplug/ibmphp_res.c:1944:6: note: here
      case PCI_HEADER_TYPE_MULTIBRIDGE:
      ^~~~

Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
---
 drivers/pci/hotplug/ibmphp_res.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/pci/hotplug/ibmphp_res.c b/drivers/pci/hotplug/ibmphp_res.c
index 5e8caf7a4452..1e1ba66cfd1e 100644
--- a/drivers/pci/hotplug/ibmphp_res.c
+++ b/drivers/pci/hotplug/ibmphp_res.c
@@ -1941,6 +1941,7 @@ static int __init update_bridge_ranges(struct bus_node **bus)
 						break;
 					case PCI_HEADER_TYPE_BRIDGE:
 						function = 0x8;
+						/* Fall through */
 					case PCI_HEADER_TYPE_MULTIBRIDGE:
 						/* We assume here that only 1 bus behind the bridge
 						   TO DO: add functionality for several:
-- 
2.22.0