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Subject[PATCH] msi: mask the msix vector before we unmap it.

With these two lines in the reverse order the drives/block/ccis.c was
oopsing in msi_free_irqs. Silly us calling writel on an area after
we unmap it.

BUG: unable to handle kernel paging request at virtual address f8b2200c
printing eip:
*pdpt = 0000000000003001
*pde = 0000000037e48067
*pte = 0000000000000000
Oops: 0002 [#1]
Modules linked in: cciss ipv6 parport_pc lp parport autofs4 i2c_dev i2c_core
sunrpc loop dm_multipath button battery asus_acpi ac tg3 floppy sg dm_snapshot
dm_zero dm_mirror ext3 jbd dm_mod ata_piix libata mptsas scsi_transport_sas
mptspi scsi_transport_spi mptscsih mptbase sd_mod scsi_mod
CPU: 1
EIP: 0060:[<c01e9cc7>] Not tainted VLI
EFLAGS: 00010286 (2.6.22-rc2-gd2579053 #1)
EIP is at msi_free_irqs+0x81/0xbe
eax: f8b22000 ebx: f71f3180 ecx: f7fff280 edx: c1886eb8
esi: f7c4e800 edi: f7c4ec48 ebp: 00000002 esp: f5a0dec8
ds: 007b es: 007b fs: 00d8 gs: 0033 ss: 0068
Process rmmod (pid: 5286, ti=f5a0d000 task=c47d2550 task.ti=f5a0d000)
Stack: 00000002 f8b72294 00000400 f8b69ca7 f8b6bc6c 00000002 00000000 00000000
00000000 00000000 00000000 f5a997f4 f8b69d61 f7c5a4b0 f7c4e848 f7c4e848
f7c4e800 f7c4e800 f8b72294 f7c4e848 f8b72294 c01e3cdf f7c4e848 c024c469
Call Trace:
[<f8b69ca7>] cciss_shutdown+0xae/0xc3 [cciss]
[<f8b69d61>] cciss_remove_one+0xa5/0x178 [cciss]
[<c01e3cdf>] pci_device_remove+0x16/0x35
[<c024c469>] __device_release_driver+0x71/0x8e
[<c024c56e>] driver_detach+0xa0/0xde
[<c024bc5c>] bus_remove_driver+0x27/0x41
[<c01e3ef3>] pci_unregister_driver+0xb/0x13
[<f8b6a343>] cciss_cleanup+0xf/0x51 [cciss]
[<c0139ced>] sys_delete_module+0x110/0x135
[<c0104c7a>] sysenter_past_esp+0x5f/0x85

Here's a patch that just reverses the 2 lines of code as Eric suggests. Please
consider this for inclusion.

Signed-off-by: Mike Miller <>
Signed-off-by: Chase Maupin <>
Signed-off-by: "Eric W. Biederman" <>
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index e01380b..6632150 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -558,12 +558,12 @@ static int msi_free_irqs(struct pci_dev* dev)

list_for_each_entry_safe(entry, tmp, &dev->msi_list, list) {
if (entry->msi_attrib.type == PCI_CAP_ID_MSIX) {
- if (list_is_last(&entry->list, &dev->msi_list))
- iounmap(entry->mask_base);
writel(1, entry->mask_base + entry->msi_attrib.entry_nr
+ if (list_is_last(&entry->list, &dev->msi_list))
+ iounmap(entry->mask_base);
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