linux-kernel - Re: -tip: origin tree boot crash

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Message-id: <alpine.LFD.2.00.0912261504460.4089@localhost.localdomain>
Date:	Sat, 26 Dec 2009 15:17:43 -0500 (EST)
From:	Len Brown <lenb@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Matthew Garrett <mjg@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: -tip: origin tree boot crash

> [   28.643216] evbug.c: Connected device: input1 (Dell WMI hotkeys at wmi/input0)
> [   28.650449] BUG: unable to handle kernel NULL pointer dereference at 00000014
> [   28.654439] IP: [<c17f7f21>] wmi_install_notify_handler+0x31/0x70

Rather than reverting the broken patch that caused wmi to load,
does applying this patch to deal with the broken error handling
cause the oops to go away?

thanks,
-Len

>From d11e073ee3e3091d9190dace97ce480e960cca1b Mon Sep 17 00:00:00 2001
From: Len Brown <len.brown@...el.com>
Date: Fri, 25 Dec 2009 23:14:26 -0500
Subject: [PATCH] Revert "wmi: Free the allocated acpi objects through wmi_get_event_data"
X-Patchwork-Hint: ignore

This reverts commit 3e9b988e4edf065d39c1343937f717319b1c1065.

Reported-by: Sedat Dilek <sedat.dilek@...glemail.com>
Tested-by Maciej Rutecki <maciej.rutecki@...il.com>
Signed-off-by: Len Brown <len.brown@...el.com>
---
 drivers/platform/x86/dell-wmi.c |    1 -
 drivers/platform/x86/hp-wmi.c   |    2 --
 drivers/platform/x86/wmi.c      |    4 ++--
 3 files changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/platform/x86/dell-wmi.c b/drivers/platform/x86/dell-wmi.c
index 916ccb2..46244c6 100644
--- a/drivers/platform/x86/dell-wmi.c
+++ b/drivers/platform/x86/dell-wmi.c
@@ -238,7 +238,6 @@ static void dell_wmi_notify(u32 value, void *context)
 			input_sync(dell_wmi_input_dev);
 		}
 	}
-	kfree(obj);
 }
 
 
diff --git a/drivers/platform/x86/hp-wmi.c b/drivers/platform/x86/hp-wmi.c
index 8781d8f..222ab57 100644
--- a/drivers/platform/x86/hp-wmi.c
+++ b/drivers/platform/x86/hp-wmi.c
@@ -388,8 +388,6 @@ static void hp_wmi_notify(u32 value, void *context)
 	} else
 		printk(KERN_INFO "HP WMI: Unknown key pressed - %x\n",
 			eventcode);
-
-	kfree(obj);
 }
 
 static int __init hp_wmi_input_setup(void)
diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c
index 9f93d6c..e425a86 100644
--- a/drivers/platform/x86/wmi.c
+++ b/drivers/platform/x86/wmi.c
@@ -540,8 +540,8 @@ EXPORT_SYMBOL_GPL(wmi_remove_notify_handler);
 /**
  * wmi_get_event_data - Get WMI data associated with an event
  *
- * @event: Event to find
- * @out: Buffer to hold event data. out->pointer should be freed with kfree()
+ * @event - Event to find
+ * &out - Buffer to hold event data
  *
  * Returns extra data associated with an event in WMI.
  */
-- 
1.6.6.rc4.11.g129a5

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