linux-kernel - wbsd: IRQ handler type mismatch

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-id: <45C7F32B.1060402@shaw.ca>
Date:	Mon, 05 Feb 2007 21:16:59 -0600
From:	Robert Hancock <hancockr@...w.ca>
To:	linux-kernel <linux-kernel@...r.kernel.org>, drzeus-wbsd@...eus.cx,
	wbsd-devel@...t.drzeus.cx
Subject: wbsd: IRQ handler type mismatch

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@...pamshaw.ca
Home Page: http://www.roberthancock.com/

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/