LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Robert Hancock <hancockr@shaw.ca>
To: linux-kernel <linux-kernel@vger.kernel.org>,
	drzeus-wbsd@drzeus.cx, wbsd-devel@list.drzeus.cx
Subject: wbsd: IRQ handler type mismatch
Date: Mon, 05 Feb 2007 21:16:59 -0600	[thread overview]
Message-ID: <45C7F32B.1060402@shaw.ca> (raw)

I'm seeing this on bootup on my laptop with recent kernels (currently 
2.6.20-rc6-mm3):

Floppy drive(s): fd0 is 1.44M
IRQ handler type mismatch for IRQ 6
current handler: wbsd
  [<c0451fe7>] setup_irq+0x194/0x1ac
  [<e0ad7189>] floppy_hardint+0x0/0xc0 [floppy]
  [<c045207b>] request_irq+0x7c/0x98
  [<e0a5c67c>] init_module+0x546/0xe15 [floppy]
  [<c05ffe85>] _spin_unlock_irq+0x5/0x7
  [<c0442410>] __link_module+0x0/0x10
  [<c0442410>] __link_module+0x0/0x10
  [<c0443d6c>] sys_init_module+0x1781/0x18c8
  [<c04dbf10>] blk_init_queue+0x0/0x8
  [<c04734f6>] vfs_read+0xa6/0x152
  [<c0404e26>] sysenter_past_esp+0x5f/0x85
  [<c0600000>] error_code+0x68/0x84
  =======================
floppy0: Unable to grab IRQ6 for the floppy driver

It looks like wbsd is being loaded first, which being a nice PnP device 
sees that IRQ 6 is available and grabs it. Then the we try to load the 
floppy module (which is hard-coded to use IRQ 6) which fails because 
wbsd already owns IRQ6 (which is fine, there's no floppy controller 
anyway). The mismatch is occurring because wbsd passes IRQF_SHARED 
whereas floppy doesn't. I assume one of the two is likely wrong. Should 
wbsd really be passing IRQF_SHARED here? This is an LPC device which 
uses ISA-style edge triggered interrupts, is it safe to try and share an 
interrupt with this chip anyway?

-- 
Robert Hancock      Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@nospamshaw.ca
Home Page: http://www.roberthancock.com/


             reply	other threads:[~2007-02-06  3:17 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-06  3:16 Robert Hancock [this message]
2007-02-06  7:01 ` Pierre Ossman
2007-02-06 11:30 ` [PATCH] kernel: shut up the IRQ mismatch messages (Re: wbsd: IRQ handler type mismatch) Alan
2007-02-06 19:29   ` Andrew Morton
2007-02-06 19:46     ` Alan

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=45C7F32B.1060402@shaw.ca \
    --to=hancockr@shaw.ca \
    --cc=drzeus-wbsd@drzeus.cx \
    --cc=linux-kernel@vger.kernel.org \
    --cc=wbsd-devel@list.drzeus.cx \
    --subject='Re: wbsd: IRQ handler type mismatch' \
    /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

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).