[PATCH 6.18 241/396] powerpc/ps3: Fix map failure path in dma_ioc0_map_pages()

6.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Thorsten Blum <[email protected]>

commit 0bb024f11d120abff3e8db9144a585b9d7fb8459 upstream.

If lv1_put_iopte() fails in dma_ioc0_map_pages(), the error path
decrements iopage but keeps using the failed mapping's offset. As a
result, it repeatedly tries to invalidate the failed IOPTE slot and
leaves the already installed IOPTEs valid.

Recompute offset and invalidate the installed IOPTEs instead.

Fixes: 6bb5cf102541 ("[POWERPC] PS3: System-bus rework")
Cc: [email protected]
Signed-off-by: Thorsten Blum <[email protected]>
Reviewed-by: Ritesh Harjani (IBM) <[email protected]>
Reviewed-by: Geert Uytterhoeven <[email protected]>
Signed-off-by: Madhavan Srinivasan <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
 arch/powerpc/platforms/ps3/mm.c |    1 +
 1 file changed, 1 insertion(+)

--- a/arch/powerpc/platforms/ps3/mm.c
+++ b/arch/powerpc/platforms/ps3/mm.c
@@ -615,6 +615,7 @@ static int dma_ioc0_map_pages(struct ps3
 
 fail_map:
 	for (iopage--; 0 <= iopage; iopage--) {
+		offset = (1 << r->page_size) * iopage;
 		lv1_put_iopte(0,
 			      c->bus_addr + offset,
 			      c->lpar_addr + offset,