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net: ethernet: ti: am65-cpsw: ensure proper channel cleanup in error path

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We are missing netif_napi_del() and am65_cpsw_nuss_free_tx/rx_chns()
in error path when am65_cpsw_nuss_init_tx/rx_chns() is used anywhere
other than at probe(). i.e. am65_cpsw_nuss_update_tx_rx_chns and
am65_cpsw_nuss_resume()

As reported, in am65_cpsw_nuss_update_tx_rx_chns(),
if am65_cpsw_nuss_init_tx_chns() partially fails then
devm_add_action(dev, am65_cpsw_nuss_free_tx_chns,..) is added
but the cleanup via am65_cpsw_nuss_free_tx_chns() will not run.

Same issue exists for am65_cpsw_nuss_init_tx/rx_chns() failures
in am65_cpsw_nuss_resume() as well.

This would otherwise require more instances of devm_add/remove_action
and is clearly more of a distraction than any benefit.

So, drop devm_add/remove_action for am65_cpsw_nuss_free_tx/rx_chns()
and call am65_cpsw_nuss_free_tx/rx_chns() and netif_napi_del()
where required.

Reported-by: Siddharth Vadapalli <s-vadapalli@ti.com>
Closes: https://lore.kernel.org/all/m4rhkzcr7dlylxr54udyt6lal5s2q4krrvmyay6gzgzhcu4q2c@r34snfumzqxy/
Signed-off-by: Roger Quadros <rogerq@kernel.org>
Link: https://patch.msgid.link/20250117-am65-cpsw-streamline-v2-1-91a29c97e569@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Roger Quadros
2025-01-17 16:06:33 +02:00
committed by Jakub Kicinski
parent b115243ab8
commit 681eb2beb3
1 changed files with 44 additions and 23 deletions
Download Patch File Download Diff File Expand all files Collapse all files

67
drivers/net/ethernet/ti/am65-cpsw-nuss.c
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@@ -2252,8 +2252,6 @@ static void am65_cpsw_nuss_remove_tx_chns(struct am65_cpsw_common *common)
struct device *dev = common->dev;
int i;
devm_remove_action(dev, am65_cpsw_nuss_free_tx_chns, common);
common->tx_ch_rate_msk = 0;
for (i = 0; i < common->tx_ch_num; i++) {
struct am65_cpsw_tx_chn *tx_chn = &common->tx_chns[i];
@@ -2275,8 +2273,6 @@ static int am65_cpsw_nuss_ndev_add_tx_napi(struct am65_cpsw_common *common)
for (i = 0; i < common->tx_ch_num; i++) {
struct am65_cpsw_tx_chn *tx_chn = &common->tx_chns[i];
netif_napi_add_tx(common->dma_ndev, &tx_chn->napi_tx,
am65_cpsw_nuss_tx_poll);
hrtimer_init(&tx_chn->tx_hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_PINNED);
tx_chn->tx_hrtimer.function = &am65_cpsw_nuss_tx_timer_callback;
@@ -2289,9 +2285,21 @@ static int am65_cpsw_nuss_ndev_add_tx_napi(struct am65_cpsw_common *common)
tx_chn->id, tx_chn->irq, ret);
goto err;
}
netif_napi_add_tx(common->dma_ndev, &tx_chn->napi_tx,
am65_cpsw_nuss_tx_poll);
}
return 0;
err:
for (--i ; i >= 0 ; i--) {
struct am65_cpsw_tx_chn *tx_chn = &common->tx_chns[i];
netif_napi_del(&tx_chn->napi_tx);
devm_free_irq(dev, tx_chn->irq, tx_chn);
}
return ret;
}
@@ -2372,12 +2380,10 @@ static int am65_cpsw_nuss_init_tx_chns(struct am65_cpsw_common *common)
goto err;
}
return 0;
err:
i = devm_add_action(dev, am65_cpsw_nuss_free_tx_chns, common);
if (i) {
dev_err(dev, "Failed to add free_tx_chns action %d\n", i);
return i;
}
am65_cpsw_nuss_free_tx_chns(common);
return ret;
}
@@ -2405,7 +2411,6 @@ static void am65_cpsw_nuss_remove_rx_chns(struct am65_cpsw_common *common)
rx_chn = &common->rx_chns;
flows = rx_chn->flows;
devm_remove_action(dev, am65_cpsw_nuss_free_rx_chns, common);
for (i = 0; i < common->rx_ch_num_flows; i++) {
if (!(flows[i].irq < 0))
@@ -2504,7 +2509,7 @@ static int am65_cpsw_nuss_init_rx_chns(struct am65_cpsw_common *common)
i, &rx_flow_cfg);
if (ret) {
dev_err(dev, "Failed to init rx flow%d %d\n", i, ret);
goto err;
goto err_flow;
}
if (!i)
fdqring_id =
@@ -2516,14 +2521,12 @@ static int am65_cpsw_nuss_init_rx_chns(struct am65_cpsw_common *common)
dev_err(dev, "Failed to get rx dma irq %d\n",
flow->irq);
ret = flow->irq;
goto err;
goto err_flow;
}
snprintf(flow->name,
sizeof(flow->name), "%s-rx%d",
dev_name(dev), i);
netif_napi_add(common->dma_ndev, &flow->napi_rx,
am65_cpsw_nuss_rx_poll);
hrtimer_init(&flow->rx_hrtimer, CLOCK_MONOTONIC,
HRTIMER_MODE_REL_PINNED);
flow->rx_hrtimer.function = &am65_cpsw_nuss_rx_timer_callback;
@@ -2536,20 +2539,28 @@ static int am65_cpsw_nuss_init_rx_chns(struct am65_cpsw_common *common)
dev_err(dev, "failure requesting rx %d irq %u, %d\n",
i, flow->irq, ret);
flow->irq = -EINVAL;
goto err;
goto err_flow;
}
netif_napi_add(common->dma_ndev, &flow->napi_rx,
am65_cpsw_nuss_rx_poll);
}
/* setup classifier to route priorities to flows */
cpsw_ale_classifier_setup_default(common->ale, common->rx_ch_num_flows);
err:
i = devm_add_action(dev, am65_cpsw_nuss_free_rx_chns, common);
if (i) {
dev_err(dev, "Failed to add free_rx_chns action %d\n", i);
return i;
return 0;
err_flow:
for (--i; i >= 0 ; i--) {
flow = &rx_chn->flows[i];
netif_napi_del(&flow->napi_rx);
devm_free_irq(dev, flow->irq, flow);
}
err:
am65_cpsw_nuss_free_rx_chns(common);
return ret;
}
@@ -3354,7 +3365,7 @@ static int am65_cpsw_nuss_register_ndevs(struct am65_cpsw_common *common)
return ret;
ret = am65_cpsw_nuss_init_rx_chns(common);
if (ret)
return ret;
goto err_remove_tx;
/* The DMA Channels are not guaranteed to be in a clean state.
* Reset and disable them to ensure that they are back to the
@@ -3375,7 +3386,7 @@ static int am65_cpsw_nuss_register_ndevs(struct am65_cpsw_common *common)
ret = am65_cpsw_nuss_register_devlink(common);
if (ret)
return ret;
goto err_remove_rx;
for (i = 0; i < common->port_num; i++) {
port = &common->ports[i];
@@ -3406,6 +3417,10 @@ static int am65_cpsw_nuss_register_ndevs(struct am65_cpsw_common *common)
err_cleanup_ndev:
am65_cpsw_nuss_cleanup_ndev(common);
am65_cpsw_unregister_devlink(common);
err_remove_rx:
am65_cpsw_nuss_remove_rx_chns(common);
err_remove_tx:
am65_cpsw_nuss_remove_tx_chns(common);
return ret;
}
@@ -3425,6 +3440,8 @@ int am65_cpsw_nuss_update_tx_rx_chns(struct am65_cpsw_common *common,
return ret;
ret = am65_cpsw_nuss_init_rx_chns(common);
if (ret)
am65_cpsw_nuss_remove_tx_chns(common);
return ret;
}
@@ -3683,6 +3700,8 @@ static void am65_cpsw_nuss_remove(struct platform_device *pdev)
*/
am65_cpsw_nuss_cleanup_ndev(common);
am65_cpsw_unregister_devlink(common);
am65_cpsw_nuss_remove_rx_chns(common);
am65_cpsw_nuss_remove_tx_chns(common);
am65_cpsw_nuss_phylink_cleanup(common);
am65_cpts_release(common->cpts);
am65_cpsw_disable_serdes_phy(common);
@@ -3744,8 +3763,10 @@ static int am65_cpsw_nuss_resume(struct device *dev)
if (ret)
return ret;
ret = am65_cpsw_nuss_init_rx_chns(common);
if (ret)
if (ret) {
am65_cpsw_nuss_remove_tx_chns(common);
return ret;
}
/* If RX IRQ was disabled before suspend, keep it disabled */
for (i = 0; i < common->rx_ch_num_flows; i++) {