From: Michael Buesch <mb@bu3sch.de>
To: "Miles Lane" <miles.lane@gmail.com>
Cc: "Andrew Morton" <akpm@linux-foundation.org>,
"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
linux-wireless <linux-wireless@vger.kernel.org>
Subject: Re: BUG: NULL pointer dereference at 00000000 -- IP: [<f8e783d5>] :b43:b43_dma_mapping_error+0x16/0x155
Date: Tue, 10 Jun 2008 16:23:33 +0200 [thread overview]
Message-ID: <200806101623.34082.mb@bu3sch.de> (raw)
In-Reply-To: <a44ae5cd0806100709rf4602f2x587631852502c0b5@mail.gmail.com>
On Tuesday 10 June 2008 16:09:37 Miles Lane wrote:
> BUG: unable to handle kernel NULL pointer dereference at 00000000
> IP: [<f8e783d5>] :b43:b43_dma_mapping_error+0x16/0x155
It seems to crash at
60 extern const struct dma_mapping_ops *dma_ops;
61
62 static inline int dma_mapping_error(dma_addr_t dma_addr)
63 {
64 if (dma_ops->mapping_error)
65 return dma_ops->mapping_error(dma_addr);
66
67 return (dma_addr == bad_dma_address);
68 }
because dma_ops is a NULL pointer here.
Can you add a WARN_ON(!dma_ops); at the beginning of the function
inside of include/asm/x86/dma-mapping.h to confirm this?
--
Greetings Michael.
next prev parent reply other threads:[~2008-06-10 14:23 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-10 14:09 BUG: NULL pointer dereference at 00000000 -- IP: [<f8e783d5>] :b43:b43_dma_mapping_error+0x16/0x155 Miles Lane
2008-06-10 14:23 ` Michael Buesch [this message]
2008-06-10 14:29 ` Vegard Nossum
2008-06-10 14:34 ` Michael Buesch
2008-06-10 14:37 ` Michael Buesch
2008-06-10 14:42 ` Miles Lane
2008-06-10 15:09 ` Vegard Nossum
2008-06-10 14:42 ` Vegard Nossum
2008-06-10 14:50 ` Michael Buesch
2008-06-10 22:09 ` Miles Lane
2008-06-10 22:15 ` Michael Buesch
2008-06-10 22:29 ` Miles Lane
2008-06-10 23:15 ` Larry Finger
2008-06-11 1:57 ` Miles Lane
2008-06-11 5:08 ` Larry Finger
2008-06-11 5:57 ` Miles Lane
2008-06-12 5:18 ` FUJITA Tomonori
2008-06-11 0:58 ` FUJITA Tomonori
2008-06-11 10:05 ` Michael Buesch
2008-06-11 12:23 ` Larry Finger
2008-06-12 5:18 ` FUJITA Tomonori
2008-06-12 9:14 ` Michael Buesch
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=200806101623.34082.mb@bu3sch.de \
--to=mb@bu3sch.de \
--cc=akpm@linux-foundation.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-wireless@vger.kernel.org \
--cc=miles.lane@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.