stm32cube: stm32h7: eth: Fix calculation of the tail pointer

erwango · erwango · commit f29bb5fb4f44 · 2025-01-31T11:27:50.000+01:00
Cherry-picking commit ceda3ceeca2ee77a76d2de2ee6b560ad87c90a48 in STM32H7 Cube HAL https://github.com/STMicroelectronics/stm32h7xx-hal-driver/ Fixed in hal_stm32 main branch following cube version update from version v1.11.2 to version v1.12.0. Signed-off-by: Erwan Gouriou <erwan.gouriou@st.com>
diff --git a/stm32cube/stm32h7xx/drivers/src/stm32h7xx_hal_eth.c b/stm32cube/stm32h7xx/drivers/src/stm32h7xx_hal_eth.c
@@ -1218,7 +1218,7 @@ static void ETH_UpdateDescriptor(ETH_HandleTypeDef *heth)
   if (heth->RxDescList.RxBuildDescCnt != desccount)
   {
     /* Set the tail pointer index */
-    tailidx = (descidx + 1U) % ETH_RX_DESC_CNT;
+    tailidx = (ETH_RX_DESC_CNT + descidx + 1U) % ETH_RX_DESC_CNT;
 
     /* DMB instruction to avoid race condition */
     __DMB();

Original file line number	Diff line number	Diff line change
`@@ -1218,7 +1218,7 @@ static void ETH_UpdateDescriptor(ETH_HandleTypeDef *heth)`
`1218`	`1218`	`if (heth->RxDescList.RxBuildDescCnt != desccount)`
`1219`	`1219`	`{`
`1220`	`1220`	`/* Set the tail pointer index */`
`1221`		`- tailidx = (descidx + 1U) % ETH_RX_DESC_CNT;`
	`1221`	`+ tailidx = (ETH_RX_DESC_CNT + descidx + 1U) % ETH_RX_DESC_CNT;`
`1222`	`1222`
`1223`	`1223`	`/* DMB instruction to avoid race condition */`
`1224`	`1224`	`__DMB();`