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powerpc/ps3: Fix map failure path in dma_ioc0_map_pages()

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commit 0bb024f11d 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: 6bb5cf1025 ("[POWERPC] PS3: System-bus rework")
Cc: stable@vger.kernel.org
Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20260711130931.740719-3-thorsten.blum@linux.dev
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Thorsten Blum
2026-08-09 20:21:54 +02:00
committed by Greg Kroah-Hartman
parent 6d98c70fe0
commit f020d756b3
1 changed files with 1 additions and 0 deletions
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arch/powerpc/platforms/ps3/mm.c
+1
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@@ -615,6 +615,7 @@ static int dma_ioc0_map_pages(struct ps3_dma_region *r, unsigned long phys_addr,
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,