KonstantinSeurer
/
mesa
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

venus: fix vn_instance_wait_roundtrip when seqno wraps 

Signed-off-by: Chia-I Wu <olvaffe@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14026>
This commit is contained in:
Chia-I Wu 2021-12-02 15:01:09 -08:00
parent 47ed98f540
commit bfa245e0c1
1 changed files with 8 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
src/virtio/vulkan/vn_instance.c
View File

@ -319,6 +319,13 @@ vn_instance_submit_roundtrip(struct vn_instance *instance,
return result;
}
static bool
roundtrip_seqno_ge(uint32_t a, uint32_t b)
{
/* a >= b, but deal with wrapping as well */
return (a - b) <= INT32_MAX;
}
void
vn_instance_wait_roundtrip(struct vn_instance *instance,
uint32_t roundtrip_seqno)
@ -328,7 +335,7 @@ vn_instance_wait_roundtrip(struct vn_instance *instance,
uint32_t iter = 0;
do {
const uint32_t cur = atomic_load_explicit(ptr, memory_order_acquire);
if (cur >= roundtrip_seqno || roundtrip_seqno - cur >= INT32_MAX)
if (roundtrip_seqno_ge(cur, roundtrip_seqno))
break;
vn_relax(&iter, "roundtrip");
} while (true);