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authorHelge Deller <deller@gmx.de>2024-01-17 17:46:43 +0100
committerHelge Deller <deller@gmx.de>2024-01-28 09:49:46 +0100
commitb9402e3b97289ca9e0f0f79f4df64bd6c9176a86 (patch)
tree68cb7031eb4abd058f99873982b14fb5f592fe29 /arch/parisc
parent2751153b9945c31eb905deb9fbe2d7f127b4b34c (diff)
parisc: Check for valid stride size for cache flushes
Report if the calculated cache stride size is zero, otherwise the cache flushing routine will never finish and hang the machine. This can be reproduced with a testcase in qemu, where the firmware reports wrong cache values. Signed-off-by: Helge Deller <deller@gmx.de>
Diffstat (limited to 'arch/parisc')
-rw-r--r--arch/parisc/kernel/cache.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/parisc/kernel/cache.c b/arch/parisc/kernel/cache.c
index 268d90a9325b..0c015487e5db 100644
--- a/arch/parisc/kernel/cache.c
+++ b/arch/parisc/kernel/cache.c
@@ -264,6 +264,10 @@ parisc_cache_init(void)
icache_stride = CAFL_STRIDE(cache_info.ic_conf);
#undef CAFL_STRIDE
+ /* stride needs to be non-zero, otherwise cache flushes will not work */
+ WARN_ON(cache_info.dc_size && dcache_stride == 0);
+ WARN_ON(cache_info.ic_size && icache_stride == 0);
+
if ((boot_cpu_data.pdc.capabilities & PDC_MODEL_NVA_MASK) ==
PDC_MODEL_NVA_UNSUPPORTED) {
printk(KERN_WARNING "parisc_cache_init: Only equivalent aliasing supported!\n");