Messages in this thread | | | Date | Thu, 7 Jul 2011 17:25:19 +0200 | Subject | Bug in BCMA: device_unregister causing "NULL pointer dereference at" | From | Rafał Miłecki <> |
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I've problem with bcma and bus subsystem.
This works fine: modprobe bcma; rmmod bcma
This: modprobe bcma; modprobe b43; rmmod b43; rmmod bcma causes: BUG: unable to handle kernel NULL pointer dereference at (null)
My BCMA has only 3 fores, out of them only 1 is registered as device: bcma: Core 0 found: ChipCommon (manuf 0x4BF, id 0x800, rev 0x22, class 0x0) bcma: Core 1 found: IEEE 802.11 (manuf 0x4BF, id 0x812, rev 0x17, class 0x0) bcma: Core 2 found: PCIe (manuf 0x4BF, id 0x820, rev 0x0F, class 0x0)
The dereference comes out from static void bcma_unregister_cores(struct bcma_bus *bus)
There is a simple loop: list_for_each_entry(core, &bus->cores, list) { if (core->dev_registered) device_unregister(&core->dev); }
So when I unload bcma after I got driver (b43) for 0x812 core, I get NULL pointer dereference.
Any tip, why does it happen?
-- Rafał -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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