linux-kernel - Re: [PATCH] SOUND: OSS sequencer should be initialized after snd_seq_system_client

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Date:	Sun, 19 Jul 2009 19:10:57 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Jaswinder Singh Rajput <jaswinder@...nel.org>
Cc:	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Catalin Marinas <catalin.marinas@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Sam Ravnborg <sam@...nborg.org>
Subject: Re: [PATCH] SOUND: OSS sequencer should be initialized after snd_seq_system_client_init

At Sun, 19 Jul 2009 21:58:34 +0530,
Jaswinder Singh Rajput wrote:
> 
> On Sun, 2009-07-19 at 18:02 +0200, Takashi Iwai wrote:
> 
> > Looks good.  Could you give a changelog and your sign-off to merge?
> > 
> 
> [PATCH] SOUND: OSS sequencer should be initialized after snd_seq_system_client_init
> 
> When build SND_SEQUENCER in kernel then OSS sequencer(alsa_seq_oss_init)
> is initialized before System (snd_seq_system_client_init) which leads to
> memory leak :
> 
> unreferenced object 0xf6b0e680 (size 256):
>   comm "swapper", pid 1, jiffies 4294670753
>   backtrace:
>     [<c108ac5c>] create_object+0x135/0x204
>     [<c108adfe>] kmemleak_alloc+0x26/0x4c
>     [<c1087de2>] kmem_cache_alloc+0x72/0xff
>     [<c126d2ac>] seq_create_client1+0x22/0x160
>     [<c126e3b6>] snd_seq_create_kernel_client+0x72/0xef
>     [<c1485a05>] snd_seq_oss_create_client+0x86/0x142
>     [<c1485920>] alsa_seq_oss_init+0xf6/0x155
>     [<c1001059>] do_one_initcall+0x4f/0x111
>     [<c14655be>] kernel_init+0x115/0x166
>     [<c10032af>] kernel_thread_helper+0x7/0x10
>     [<ffffffff>] 0xffffffff
> unreferenced object 0xf688a580 (size 64):
>   comm "swapper", pid 1, jiffies 4294670753
>   backtrace:
>     [<c108ac5c>] create_object+0x135/0x204
>     [<c108adfe>] kmemleak_alloc+0x26/0x4c
>     [<c1087de2>] kmem_cache_alloc+0x72/0xff
>     [<c126f964>] snd_seq_pool_new+0x1c/0xb8
>     [<c126d311>] seq_create_client1+0x87/0x160
>     [<c126e3b6>] snd_seq_create_kernel_client+0x72/0xef
>     [<c1485a05>] snd_seq_oss_create_client+0x86/0x142
>     [<c1485920>] alsa_seq_oss_init+0xf6/0x155
>     [<c1001059>] do_one_initcall+0x4f/0x111
>     [<c14655be>] kernel_init+0x115/0x166
>     [<c10032af>] kernel_thread_helper+0x7/0x10
>     [<ffffffff>] 0xffffffff
> unreferenced object 0xf6b0e480 (size 256):
>   comm "swapper", pid 1, jiffies 4294670754
>   backtrace:
>     [<c108ac5c>] create_object+0x135/0x204
>     [<c108adfe>] kmemleak_alloc+0x26/0x4c
>     [<c1087de2>] kmem_cache_alloc+0x72/0xff
>     [<c12725a0>] snd_seq_create_port+0x51/0x21c
>     [<c126de50>] snd_seq_ioctl_create_port+0x57/0x13c
>     [<c126d07a>] snd_seq_do_ioctl+0x4a/0x69
>     [<c126d0de>] snd_seq_kernel_client_ctl+0x33/0x49
>     [<c1485a74>] snd_seq_oss_create_client+0xf5/0x142
>     [<c1485920>] alsa_seq_oss_init+0xf6/0x155
>     [<c1001059>] do_one_initcall+0x4f/0x111
>     [<c14655be>] kernel_init+0x115/0x166
>     [<c10032af>] kernel_thread_helper+0x7/0x10
>     [<ffffffff>] 0xffffffff
> 
> The correct order should be :
> 
> System (snd_seq_system_client_init) should be initialized before
> OSS sequencer(alsa_seq_oss_init) which is equivalent to :
> 
> 1. insmod sound/core/seq/snd-seq-device.ko
> 2. insmod sound/core/seq/snd-seq.ko
> 3. insmod sound/core/seq/snd-seq-midi-event.ko
> 4. insmod sound/core/seq/oss/snd-seq-oss.ko
> 
> Including sound/core/seq/oss/Makefile after other seq modules
> fixes the ordering and memory leak.
> 
> Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@...il.com>

Thanks, applied now.


Takashi

> ---
>  sound/core/seq/Makefile |    7 ++-----
>  1 files changed, 2 insertions(+), 5 deletions(-)
> 
> diff --git a/sound/core/seq/Makefile b/sound/core/seq/Makefile
> index 1bcb360..941f64a 100644
> --- a/sound/core/seq/Makefile
> +++ b/sound/core/seq/Makefile
> @@ -3,10 +3,6 @@
>  # Copyright (c) 1999 by Jaroslav Kysela <perex@...ex.cz>
>  #
>  
> -ifeq ($(CONFIG_SND_SEQUENCER_OSS),y)
> -  obj-$(CONFIG_SND_SEQUENCER) += oss/
> -endif
> -
>  snd-seq-device-objs := seq_device.o
>  snd-seq-objs := seq.o seq_lock.o seq_clientmgr.o seq_memory.o seq_queue.o \
>                  seq_fifo.o seq_prioq.o seq_timer.o \
> @@ -19,7 +15,8 @@ snd-seq-virmidi-objs := seq_virmidi.o
>  
>  obj-$(CONFIG_SND_SEQUENCER) += snd-seq.o snd-seq-device.o
>  ifeq ($(CONFIG_SND_SEQUENCER_OSS),y)
> -obj-$(CONFIG_SND_SEQUENCER) += snd-seq-midi-event.o
> +  obj-$(CONFIG_SND_SEQUENCER) += snd-seq-midi-event.o
> +  obj-$(CONFIG_SND_SEQUENCER) += oss/
>  endif
>  obj-$(CONFIG_SND_SEQ_DUMMY) += snd-seq-dummy.o
>  
> -- 
> 1.6.0.6
> 
> 
> 
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