[PULL,01/18] hw/net/can/xlnx-versal-canfd: Fix sorting of the tx queue

Commit Message

Peter Maydell June 22, 2024, 12:06 p.m. UTC

From: Shiva sagar Myana <[e-mail]>

Returning an uint32_t casted to a gint from g_cmp_ids causes the tx queue to
become wrongly sorted when executing g_slist_sort. Fix this by always
returning -1 or 1 from g_cmp_ids based on the ID comparison instead.
Also, if two message IDs are the same, sort them by using their index and
transmit the message at the lowest index first.

Signed-off-by: Shiva sagar Myana <[e-mail]>
Reviewed-by: Francisco Iglesias <[e-mail]>
Message-id: [e-mail]
Signed-off-by: Peter Maydell <[e-mail]>
---
 hw/net/can/xlnx-versal-canfd.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

Patch

diff --git a/hw/net/can/xlnx-versal-canfd.c b/hw/net/can/xlnx-versal-canfd.c
index 47a14cfe633..5f083c21e93 100644
--- a/hw/net/can/xlnx-versal-canfd.c
+++ b/hw/net/can/xlnx-versal-canfd.c
@@ -1312,7 +1312,10 @@  static gint g_cmp_ids(gconstpointer data1, gconstpointer data2)
     tx_ready_reg_info *tx_reg_1 = (tx_ready_reg_info *) data1;
     tx_ready_reg_info *tx_reg_2 = (tx_ready_reg_info *) data2;
 
-    return tx_reg_1->can_id - tx_reg_2->can_id;
+    if (tx_reg_1->can_id == tx_reg_2->can_id) {
+        return (tx_reg_1->reg_num < tx_reg_2->reg_num) ? -1 : 1;
+    }
+    return (tx_reg_1->can_id < tx_reg_2->can_id) ? -1 : 1;
 }
 
 static void free_list(GSList *list)