linux-kernel - Re: [patch] portman2x4.c: fix boot hang

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Date:	Thu, 25 Oct 2007 10:16:44 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org, Jaroslav Kysela <perex@...e.cz>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [patch] portman2x4.c: fix boot hang

At Wed, 24 Oct 2007 21:44:17 +0200,
Ingo Molnar wrote:
> 
> Subject: portman2x4.c: fix boot hang
> From: Ingo Molnar <mingo@...e.hu>
> 
> when booting an allyesconfig bzImage kernel the bootup hangs in the 
> portman2x4 driver (on a box that does not have this hardware), at:
> 
>  Pid: 1, comm:              swapper
>  EIP: 0060:[<c02f763c>] CPU: 0
>  EIP is at parport_pc_read_status+0x4/0x8
>   EFLAGS: 00000202    Not tainted  (2.6.23-rc9 #904)
>  EAX: f7e57a7f EBX: 00000010 ECX: c2b808c0 EDX: 00000379
>  ESI: f7cb8230 EDI: 00000010 EBP: f7cb8230 DS: 007b ES: 007b FS: 0000
>  CR0: 8005003b CR2: fff9c000 CR3: 007ec000 CR4: 00000690
>  DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
>  DR6: ffff0ff0 DR7: 00000400
>   [<c04613de>] portman_flush_input+0xde/0x12c
>   [<c0461a24>] snd_portman_probe+0x368/0x484
>   [<c02fbb8c>] __device_attach+0x0/0x8
>   [<c02fce68>] platform_drv_probe+0xc/0x10
>   [<c02fba6c>] driver_probe_device+0x74/0x194
>   [<c0587174>] klist_next+0x38/0x70
>   [<c02fbb8c>] __device_attach+0x0/0x8
>   [<c02faea1>] bus_for_each_drv+0x35/0x68
>   [<c02fbc22>] device_attach+0x72/0x78
> 
> the reason is due to an inconsistent error return code of 1 or 2, while 
> snd_portman_probe only realizes negative error codes.
> 
> with this fixed the probe fails as it should and the bootup continues.
> 
> Signed-off-by: Ingo Molnar <mingo@...e.hu>

Thanks.  But isn't the patch below easier?


Takashi

diff -r 09088524dd7f drivers/portman2x4.c
--- a/drivers/portman2x4.c	Thu Oct 25 11:46:24 2007 +0200
+++ b/drivers/portman2x4.c	Thu Oct 25 11:49:17 2007 +0200
@@ -668,7 +668,7 @@ static int __devinit snd_portman_probe_p
 	parport_release(pardev);
 	parport_unregister_device(pardev);
 
-	return res;
+	return res ? -EIO : 0;
 }
 
 static void __devinit snd_portman_attach(struct parport *p)
-
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