From: Frieder Schrempf frieder.schrempf@kontron.de
[ Upstream commit 03c427147b2d3e503af258711af4fc792b89b0af ]
Since 8ce8c0abcba3 the driver queues work via priv->restart_work when resuming after suspend, even when the interface was not previously enabled. This causes a null dereference error as the workqueue is only allocated and initialized in mcp251x_open().
To fix this we move the workqueue init to mcp251x_can_probe() as there is no reason to do it later and repeat it whenever mcp251x_open() is called.
Fixes: 8ce8c0abcba3 ("can: mcp251x: only reset hardware as required") Link: https://lore.kernel.org/r/17d5d714-b468-482f-f37a-482e3d6df84e@kontron.de Signed-off-by: Frieder Schrempf frieder.schrempf@kontron.de Reviewed-by: Andy Shevchenko andriy.shevchenko@linux.intel.com [mkl: fix error handling in mcp251x_stop()] Signed-off-by: Marc Kleine-Budde mkl@pengutronix.de Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/can/spi/mcp251x.c | 35 ++++++++++++++++++----------------- 1 file changed, 18 insertions(+), 17 deletions(-)
diff --git a/drivers/net/can/spi/mcp251x.c b/drivers/net/can/spi/mcp251x.c index 42c3046fa304..89897a2d41fa 100644 --- a/drivers/net/can/spi/mcp251x.c +++ b/drivers/net/can/spi/mcp251x.c @@ -956,8 +956,6 @@ static int mcp251x_stop(struct net_device *net)
priv->force_quit = 1; free_irq(spi->irq, priv); - destroy_workqueue(priv->wq); - priv->wq = NULL;
mutex_lock(&priv->mcp_lock);
@@ -1224,24 +1222,15 @@ static int mcp251x_open(struct net_device *net) goto out_close; }
- priv->wq = alloc_workqueue("mcp251x_wq", WQ_FREEZABLE | WQ_MEM_RECLAIM, - 0); - if (!priv->wq) { - ret = -ENOMEM; - goto out_clean; - } - INIT_WORK(&priv->tx_work, mcp251x_tx_work_handler); - INIT_WORK(&priv->restart_work, mcp251x_restart_work_handler); - ret = mcp251x_hw_wake(spi); if (ret) - goto out_free_wq; + goto out_free_irq; ret = mcp251x_setup(net, spi); if (ret) - goto out_free_wq; + goto out_free_irq; ret = mcp251x_set_normal_mode(spi); if (ret) - goto out_free_wq; + goto out_free_irq;
can_led_event(net, CAN_LED_EVENT_OPEN);
@@ -1250,9 +1239,7 @@ static int mcp251x_open(struct net_device *net)
return 0;
-out_free_wq: - destroy_workqueue(priv->wq); -out_clean: +out_free_irq: free_irq(spi->irq, priv); mcp251x_hw_sleep(spi); out_close: @@ -1373,6 +1360,15 @@ static int mcp251x_can_probe(struct spi_device *spi) if (ret) goto out_clk;
+ priv->wq = alloc_workqueue("mcp251x_wq", WQ_FREEZABLE | WQ_MEM_RECLAIM, + 0); + if (!priv->wq) { + ret = -ENOMEM; + goto out_clk; + } + INIT_WORK(&priv->tx_work, mcp251x_tx_work_handler); + INIT_WORK(&priv->restart_work, mcp251x_restart_work_handler); + priv->spi = spi; mutex_init(&priv->mcp_lock);
@@ -1417,6 +1413,8 @@ static int mcp251x_can_probe(struct spi_device *spi) return 0;
error_probe: + destroy_workqueue(priv->wq); + priv->wq = NULL; mcp251x_power_enable(priv->power, 0);
out_clk: @@ -1438,6 +1436,9 @@ static int mcp251x_can_remove(struct spi_device *spi)
mcp251x_power_enable(priv->power, 0);
+ destroy_workqueue(priv->wq); + priv->wq = NULL; + clk_disable_unprepare(priv->clk);
free_candev(net);