6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx> [ Upstream commit 9bd405c48b0ac4de087c0c4440fd79597201b8a7 ] Align the end size to cache boundary size in ax45mp_dma_cache_wback() callback likewise done in ax45mp_dma_cache_inv() callback. Additionally return early in case of start == end. Fixes: d34599bcd2e4 ("cache: Add L2 cache management for Andes AX45MP RISC-V core") Reported-by: Pavel Machek <pavel@xxxxxxx> Link: https://lore.kernel.org/cip-dev/ZYsdKDiw7G+kxQ3m@xxxxxxxxxx/ Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx> Signed-off-by: Conor Dooley <conor.dooley@xxxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/cache/ax45mp_cache.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/cache/ax45mp_cache.c b/drivers/cache/ax45mp_cache.c index 57186c58dc849..1d7dd3d2c101c 100644 --- a/drivers/cache/ax45mp_cache.c +++ b/drivers/cache/ax45mp_cache.c @@ -129,8 +129,12 @@ static void ax45mp_dma_cache_wback(phys_addr_t paddr, size_t size) unsigned long line_size; unsigned long flags; + if (unlikely(start == end)) + return; + line_size = ax45mp_priv.ax45mp_cache_line_size; start = start & (~(line_size - 1)); + end = ((end + line_size - 1) & (~(line_size - 1))); local_irq_save(flags); ax45mp_cpu_dcache_wb_range(start, end); local_irq_restore(flags); -- 2.43.0