drm/nouveau/bios: make jump conditional

This fixes a hang in VBIOS scripts of the form "condition; jump".
The jump used to always be executed, while now it will only be
executed if the condition is true.

See https://bugs.freedesktop.org/show_bug.cgi?id=72943

Reported-by: Darcy Brás da Silva <dardevelin@cidadecool.com>
Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Cc: stable@vger.kernel.org

diff --git a/drivers/gpu/drm/nouveau/core/subdev/bios/init.c b/drivers/gpu/drm/nouveau/core/subdev/bios/init.c
index 420908cb82b613bbc97fbccb9b123f3449926100..9f5b81e9973121bf5076b0e46f166b82876b6e6f 100644 (file)
--- a/drivers/gpu/drm/nouveau/core/subdev/bios/init.c
+++ b/drivers/gpu/drm/nouveau/core/subdev/bios/init.c
@@ -1294,7 +1294,11 @@ init_jump(struct nvbios_init *init)
        u16 offset = nv_ro16(bios, init->offset + 1);
 
        trace("JUMP\t0x%04x\n", offset);
-       init->offset = offset;
+
+       if (init_exec(init))
+               init->offset = offset;
+       else
+               init->offset += 3;
 }
 
 /**