linux-kernel - [PATCH 3/5] habanalabs: if map page fails don't try to unmap it

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Date:   Sun, 21 Aug 2022 11:28:21 +0300
From:   Oded Gabbay <ogabbay@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     Dafna Hirschfeld <dhirschfeld@...ana.ai>
Subject: [PATCH 3/5] habanalabs: if map page fails don't try to unmap it

From: Dafna Hirschfeld <dhirschfeld@...ana.ai>

The original code tried to unmap a page that was not mapped as part of
the map page error path.

Signed-off-by: Dafna Hirschfeld <dhirschfeld@...ana.ai>
Reviewed-by: Oded Gabbay <ogabbay@...nel.org>
Signed-off-by: Oded Gabbay <ogabbay@...nel.org>
---
 drivers/misc/habanalabs/common/mmu/mmu.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/misc/habanalabs/common/mmu/mmu.c b/drivers/misc/habanalabs/common/mmu/mmu.c
index 60740de47b34..4153aec55594 100644
--- a/drivers/misc/habanalabs/common/mmu/mmu.c
+++ b/drivers/misc/habanalabs/common/mmu/mmu.c
@@ -403,6 +403,8 @@ int hl_mmu_map_contiguous(struct hl_ctx *ctx, u64 virt_addr,
 			dev_err(hdev->dev,
 				"Map failed for va 0x%llx to pa 0x%llx\n",
 				curr_va, curr_pa);
+			/* last mapping failed so don't try to unmap it - reduce off by page_size */
+			off -= page_size;
 			goto unmap;
 		}
 	}
-- 
2.25.1