On 09/22/2011 07:48 PM, Ram Pai wrote:
Resource: wrong resource window calculation __find_resource() incorrectly returns a resource window which overlaps an existing allocated window. This happens when the parent's resource-window spans 0x00000000 to 0xffffffff and is entirely allocated to all its children resource-windows. __find_resource() looks for gaps in resource allocation among the children resource windows. When it encounters the last child window it blindly tries the range next to one allocated to the last child. Since the last child's window ends at 0xffffffff the calculation overflows, leading the algorithm to believe that any window in the range 0x0000000 to 0xfffffff is available for allocation. This leads to a conflicting window allocation. Michal Ludvig reported this issue seen on his platform. The following patch fixes the problem and has been verified by Michal. I believe this bug has been there for ages. It got exposed by git commit 2bbc6942273b5b3097bd265d82227bdd84b351b2 [PATCH] PCI : ability to relocate assigned pci-resources Signed-off-by: Ram Pai<linuxram@xxxxxxxxxx>
Tested-by: Michal Ludvig <mludvig@xxxxxxxxxxxx> Works fine on top of 3.1.0-rc7 and solves the problem with my Jetway board. Thanks Ram! M. -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
