linux-kernel - Re: [PATCH] Bluetooth: Pre-initialize variables in read_local_oob_ext_data

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Message-Id: <A962A040-4EB5-4AE6-A790-A8767185172B@holtmann.org>
Date:	Thu, 16 Apr 2015 13:34:54 -0700
From:	Marcel Holtmann <marcel@...tmann.org>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	"Gustavo F. Padovan" <gustavo@...ovan.org>,
	Johan Hedberg <johan.hedberg@...il.com>,
	BlueZ development <linux-bluetooth@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Bluetooth: Pre-initialize variables in read_local_oob_ext_data_complete()

Hi Geert,

> net/bluetooth/mgmt.c: In function ‘read_local_oob_ext_data_complete’:
> net/bluetooth/mgmt.c:6474: warning: ‘r256’ may be used uninitialized in this function
> net/bluetooth/mgmt.c:6474: warning: ‘h256’ may be used uninitialized in this function
> net/bluetooth/mgmt.c:6474: warning: ‘r192’ may be used uninitialized in this function
> net/bluetooth/mgmt.c:6474: warning: ‘h192’ may be used uninitialized in this function
> 
> While these are false positives, the code can be shortened by
> pre-initializing the hash table pointers and eir_len. This has the side
> effect of killing the compiler warnings.

can you be a bit specific on which compiler version is this. I fixed one occurrence that seemed valid. However in this case the compiler seems to be just plain stupid. On a gcc 4.9, I am not seeing these for example.

Regards

Marcel

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