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PCI: apple: Initialize pcie->nvecs before use
[ Upstream commit d8650c0 ] The apple_pcie_setup_port() function computes ilog2(pcie->nvecs) to set up the number of MSIs available for each port. However, it's called before apple_msi_init(), which initializes pcie->nvecs. Luckily, pcie->nvecs is part of kzalloc()-ed structure and, as such, initialized as zero. ilog2(0) happens to be 0xffffffff which then simply configures more MSIs in hardware than we have. This doesn't break anything because we never hand out those vectors. Thus, swap the order of the two calls so that the correctly initialized value is then used. [kwilczynski: commit log] Link: https://lore.kernel.org/linux-pci/20230311133453.63246-1-sven@svenpeter.dev Fixes: 476c41e ("PCI: apple: Implement MSI support") Signed-off-by: Sven Peter <sven@svenpeter.dev> Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org> Reviewed-by: Marc Zyngier <maz@kernel.org> Reviewed-by: Alyssa Rosenzweig <alyssa@rosenzweig.io> Reviewed-by: Eric Curtin <ecurtin@redhat.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
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