Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
LoongArch: Don't panic if no valid cache info for PCI
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>
+4
-4
+4
-4
arch/loongarch/pci/pci.c
+4
-4
arch/loongarch/pci/pci.c
···
50
50
*/
51
51
lsize = cpu_last_level_cache_line_size();
52
52
53
-
BUG_ON(!lsize);
53
+
if (lsize) {
54
+
pci_dfl_cache_line_size = lsize >> 2;
54
55
55
-
pci_dfl_cache_line_size = lsize >> 2;
56
-
57
-
pr_debug("PCI: pci_cache_line_size set to %d bytes\n", lsize);
56
+
pr_debug("PCI: pci_cache_line_size set to %d bytes\n", lsize);
57
+
}
58
58
59
59
return 0;
60
60
}