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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).