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

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Date:	Wed, 24 Oct 2007 21:44:17 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	linux-kernel@...r.kernel.org
Cc:	Takashi Iwai <tiwai@...e.de>, Jaroslav Kysela <perex@...e.cz>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [patch] portman2x4.c: fix boot hang

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>
---
 sound/drivers/portman2x4.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

Index: linux/sound/drivers/portman2x4.c
===================================================================
--- linux.orig/sound/drivers/portman2x4.c
+++ linux/sound/drivers/portman2x4.c
@@ -467,7 +467,7 @@ static int portman_probe(struct parport 
 	/* Check for ESTB to be clear */
 	/* 4 */
 	if ((parport_read_status(p) & ESTB) == ESTB)
-		return 1;	/* CODE 1 - Strobe Failure. */
+		return -EIO;	/* CODE 1 - Strobe Failure. */
 
 	/* Set for RXDATA0 where no damage will be done. */
 	/* 5 */
@@ -475,7 +475,7 @@ static int portman_probe(struct parport 
 
 	/* 6 */
 	if ((parport_read_status(p) & ESTB) != ESTB)
-		return 1;	/* CODE 1 - Strobe Failure. */
+		return -EIO;	/* CODE 1 - Strobe Failure. */
 
 	/* 7 */
 	parport_write_control(p, 0);	/* Reset Strobe=0. */
@@ -491,7 +491,7 @@ static int portman_probe(struct parport 
 	 */
 	/* 9 */
 	if ((parport_read_status(p) & TXEMPTY) == 0)
-		return 2;
+		return -EIO;
 
 	/* Return OK status. */
 	return 0;

-
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