[PATCH] net: ti: am65-cpsw-nuss: Fix crash when changing number of TX queues

[PATCH] net: ti: am65-cpsw-nuss: Fix crash when changing number of TX queues

[Vignesh Raghavendra]

When changing number of TX queues using ethtool:

	# ethtool -L eth0 tx 1
	[  135.301047] Unable to handle kernel paging request at virtual address 00000000af5d0000
	[...]
	[  135.525128] Call trace:
	[  135.525142]  dma_release_from_dev_coherent+0x2c/0xb0
	[  135.525148]  dma_free_attrs+0x54/0xe0
	[  135.525156]  k3_cppi_desc_pool_destroy+0x50/0xa0
	[  135.525164]  am65_cpsw_nuss_remove_tx_chns+0x88/0xdc
	[  135.525171]  am65_cpsw_set_channels+0x3c/0x70
	[...]

This is because k3_cppi_desc_pool_destroy() which is called after
k3_udma_glue_release_tx_chn() in am65_cpsw_nuss_remove_tx_chns()
references struct device that is unregistered at the end of
k3_udma_glue_release_tx_chn()

Therefore the right order is to call k3_cppi_desc_pool_destroy() and
destroy desc pool before calling k3_udma_glue_release_tx_chn().
Fix this throughout the driver.

Fixes: 93a76530316a ("net: ethernet: ti: introduce am65x/j721e gigabit eth subsystem driver")
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
---
 drivers/net/ethernet/ti/am65-cpsw-nuss.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.c b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
index 6a67b026df0b..718539cdd2f2 100644
--- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c
+++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
@@ -1506,12 +1506,12 @@ static void am65_cpsw_nuss_free_tx_chns(void *data)
 	for (i = 0; i < common->tx_ch_num; i++) {
 		struct am65_cpsw_tx_chn *tx_chn = &common->tx_chns[i];
 
-		if (!IS_ERR_OR_NULL(tx_chn->tx_chn))
-			k3_udma_glue_release_tx_chn(tx_chn->tx_chn);
-
 		if (!IS_ERR_OR_NULL(tx_chn->desc_pool))
 			k3_cppi_desc_pool_destroy(tx_chn->desc_pool);
 
+		if (!IS_ERR_OR_NULL(tx_chn->tx_chn))
+			k3_udma_glue_release_tx_chn(tx_chn->tx_chn);
+
 		memset(tx_chn, 0, sizeof(*tx_chn));
 	}
 }
@@ -1531,12 +1531,12 @@ void am65_cpsw_nuss_remove_tx_chns(struct am65_cpsw_common *common)
 
 		netif_napi_del(&tx_chn->napi_tx);
 
-		if (!IS_ERR_OR_NULL(tx_chn->tx_chn))
-			k3_udma_glue_release_tx_chn(tx_chn->tx_chn);
-
 		if (!IS_ERR_OR_NULL(tx_chn->desc_pool))
 			k3_cppi_desc_pool_destroy(tx_chn->desc_pool);
 
+		if (!IS_ERR_OR_NULL(tx_chn->tx_chn))
+			k3_udma_glue_release_tx_chn(tx_chn->tx_chn);
+
 		memset(tx_chn, 0, sizeof(*tx_chn));
 	}
 }
@@ -1624,11 +1624,11 @@ static void am65_cpsw_nuss_free_rx_chns(void *data)
 
 	rx_chn = &common->rx_chns;
 
-	if (!IS_ERR_OR_NULL(rx_chn->rx_chn))
-		k3_udma_glue_release_rx_chn(rx_chn->rx_chn);
-
 	if (!IS_ERR_OR_NULL(rx_chn->desc_pool))
 		k3_cppi_desc_pool_destroy(rx_chn->desc_pool);
+
+	if (!IS_ERR_OR_NULL(rx_chn->rx_chn))
+		k3_udma_glue_release_rx_chn(rx_chn->rx_chn);
 }
 
 static int am65_cpsw_nuss_init_rx_chns(struct am65_cpsw_common *common)
-- 
2.32.0

Re: [PATCH] net: ti: am65-cpsw-nuss: Fix crash when changing number of TX queues

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net.git (refs/heads/master):

On Tue, 22 Jun 2021 20:08:57 +0530 you wrote:
> When changing number of TX queues using ethtool:
> 
> 	# ethtool -L eth0 tx 1
> 	[  135.301047] Unable to handle kernel paging request at virtual address 00000000af5d0000
> 	[...]
> 	[  135.525128] Call trace:
> 	[  135.525142]  dma_release_from_dev_coherent+0x2c/0xb0
> 	[  135.525148]  dma_free_attrs+0x54/0xe0
> 	[  135.525156]  k3_cppi_desc_pool_destroy+0x50/0xa0
> 	[  135.525164]  am65_cpsw_nuss_remove_tx_chns+0x88/0xdc
> 	[  135.525171]  am65_cpsw_set_channels+0x3c/0x70
> 	[...]
> 
> [...]

Here is the summary with links:
  - net: ti: am65-cpsw-nuss: Fix crash when changing number of TX queues
    https://git.kernel.org/netdev/net/c/ce8eb4c728ef

You are awesome, thank you!
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