From 0b85476d864b8894396b2b1c74da5889850bdc6e Mon Sep 17 00:00:00 2001
From: Karol Herbst <kherbst@redhat.com>
Date: Wed, 12 Jun 2024 21:59:19 +0200
Subject: [PATCH] v3d: never replace a mapped bo

The application might have a pointer into the mapped bo.

Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/25362>
---
 src/gallium/drivers/v3d/v3d_resource.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/gallium/drivers/v3d/v3d_resource.c b/src/gallium/drivers/v3d/v3d_resource.c
index 1b806dfb089..8a11c5650e7 100644
--- a/src/gallium/drivers/v3d/v3d_resource.c
+++ b/src/gallium/drivers/v3d/v3d_resource.c
@@ -101,6 +101,10 @@ v3d_resource_bo_alloc(struct v3d_resource *rsc)
         struct pipe_screen *pscreen = prsc->screen;
         struct v3d_bo *bo;
 
+        /* never replace a mapped bo */
+        if (rsc->bo && rsc->bo->map)
+                return false;
+
         /* Buffers may be read using ldunifa, which prefetches the next
          * 4 bytes after a read. If the buffer's size is exactly a multiple
          * of a page size and the shader reads the last 4 bytes with ldunifa