Linux tries to pre-allocate minimal resources to hotplug bridges. This
works fine as long as there are enough resources to satisfy all other
genuine resource requirements. However if enough resources are not
available to satisfy any of these nice-to-have pre-allocations, the
resource-allocator reports errors and returns failure.
This patch distinguishes between must-have resource from nice-to-have
resource. Any failure to allocate nice-to-have resources are ignored.
This behavior can be particularly useful to trigger automatic
reallocation when the OS discovers genuine allocation-conflicts
or genuine unallocated-requests caused by buggy allocation behavior
of the native BIOS/uEFI.
https://bugzilla.kernel.org/show_bug.cgi?id=15960 captures the movitation
behind the patch. This patch is verified to resolve the above bug.
The first 3 patches refactors common code and builds the ground work
for the 4 patch which contains the core piece of the fix.
patch 1/4: refactors the io size calculation logic
patch 2/4: refactors the list freeing logic
patch 3/4: refactors the resource reset logic
patch 4/4: contains the fix to the original problem
drivers/pci/setup-bus.c | 269 ++++++++++++++++++++++++++++++++++------------
Signed-off-by: Ram Pai <linuxram@xxxxxxxxxx>
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