[PATCH 6.6 266/299] cache: ax45mp_cache: Align end size to cache boundary in ax45mp_dma_cache_wback()

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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







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