[patch 25/87] icom: fix rmmod crash

[Greg KH]

2.6.29-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Breno Leitao <leitao@xxxxxxxxxxxxxxxxxx>

commit 95caa0a9bdaf93607bd0cc8932f53112496f2f22 upstream.

Actually the icom driver is crashing when is being removed because
the driver is kfreeing the adapter structure before calling
pci_release_regions(), which result in the following error:

  Unable to handle kernel paging request for data at address 0x6b6b6b6b6b6b6d33
  Faulting instruction address: 0xc000000000246b80
  Oops: Kernel access of bad area, sig: 11 [#1]
  ....
  [c000000012d436a0] [c0000000001002d0] .kfree+0x120/0x34c (unreliable)
  [c000000012d43730] [c000000000246d60] .pci_release_selected_regions+0x3c/0x68
  [c000000012d437c0] [d000000002d54700] .icom_kref_release+0xf4/0x118 [icom]
  [c000000012d43850] [c000000000232e50] .kref_put+0x74/0x94
  [c000000012d438d0] [d000000002d56c58] .icom_remove+0x40/0xa4 [icom]
  [c000000012d43960] [c000000000249e48] .pci_device_remove+0x50/0x90
  [c000000012d439e0] [c0000000002d68d8] .__device_release_driver+0x94/0xd4
  [c000000012d43a70] [c0000000002d7104] .driver_detach+0xf8/0x12c
  [c000000012d43b00] [c0000000002d549c] .bus_remove_driver+0xbc/0x11c
  [c000000012d43b90] [c0000000002d71dc] .driver_unregister+0x60/0x80
  [c000000012d43c20] [c00000000024a07c] .pci_unregister_driver+0x44/0xe8
  [c000000012d43cb0] [d000000002d56bf4] .icom_exit+0x1c/0x40 [icom]
  [c000000012d43d30] [c000000000095fa8] .SyS_delete_module+0x214/0x2a8
  [c000000012d43e30] [c00000000000852c] syscall_exit+0x0/0x40

Signed-off-by: Breno Leitao <leitao@xxxxxxxxxxxxxxxxxx>
Cc: Alan Cox <alan@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 drivers/serial/icom.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/serial/icom.c
+++ b/drivers/serial/icom.c
@@ -1482,8 +1482,8 @@ static void icom_remove_adapter(struct i
 
 	free_irq(icom_adapter->pci_dev->irq, (void *) icom_adapter);
 	iounmap(icom_adapter->base_addr);
-	icom_free_adapter(icom_adapter);
 	pci_release_regions(icom_adapter->pci_dev);
+	icom_free_adapter(icom_adapter);
 }
 
 static void icom_kref_release(struct kref *kref)


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