6.12-stable review patch. If anyone has any objections, please let me know.
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From: Huacai Chen chenhuacai@loongson.cn
commit a6b533adfc05ba15360631e019d3e18275080275 upstream.
If there is no valid cache info detected (may happen in virtual machine) for pci_dfl_cache_line_size, kernel shouldn't panic. Because in the PCI core it will be evaluated to (L1_CACHE_BYTES >> 2).
Cc: stable@vger.kernel.org Signed-off-by: Jiaxun Yang jiaxun.yang@flygoat.com Signed-off-by: Huacai Chen chenhuacai@loongson.cn Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/loongarch/pci/pci.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)
--- a/arch/loongarch/pci/pci.c +++ b/arch/loongarch/pci/pci.c @@ -51,11 +51,11 @@ static int __init pcibios_init(void) */ lsize = cpu_last_level_cache_line_size();
- BUG_ON(!lsize); + if (lsize) { + pci_dfl_cache_line_size = lsize >> 2;
- pci_dfl_cache_line_size = lsize >> 2; - - pr_debug("PCI: pci_cache_line_size set to %d bytes\n", lsize); + pr_debug("PCI: pci_cache_line_size set to %d bytes\n", lsize); + }
return 0; }