linux-kernel - [PATCHv2] usb: f_fs: replace BUG in dead-code with less serious WARN

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Date:	Thu, 11 Sep 2014 18:52:49 +0200
From:	Michal Nazarewicz <mina86@...a86.com>
To:	Felipe Balbi <balbi@...com>
Cc:	Felipe Balbi <balbi@...com>,
	Dan Carpenter <dan.carpenter@...cle.com>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCHv2] usb: f_fs: replace BUG in dead-code with less serious WARN_ON

Even though the BUG() in __ffs_event_add is a dead-code, it is still
better to warn rather then crash the system if that code ever gets
executed.

Reported-by: Felipe Balbi <balbi@...com>
Signed-off-by: Michal Nazarewicz <mina86@...a86.com>
---
 drivers/usb/gadget/function/f_fs.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

On Wed, Sep 10 2014, Felipe Balbi <balbi@...com> wrote:
> WARN(1, "unknown event type %d\n", type);
> Then you can drop pr_vdebug();

True, but the printk call will stay in the binary whereas pr_vdebug is not
included in non-debug builds.  Furthermore, WARN() does not use pr_fmt.

diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c
index ec50e0d..ea21565 100644
--- a/drivers/usb/gadget/function/f_fs.c
+++ b/drivers/usb/gadget/function/f_fs.c
@@ -2321,7 +2321,8 @@ static void __ffs_event_add(struct ffs_data *ffs,
 		break;
 
 	default:
-		BUG();
+		WARN(1, "%d: unknown event, this should not happen\n", type);
+		return;
 	}
 
 	{
-- 
2.1.0.rc2.206.gedb03e5
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