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authorAnssi Hannula <anssi.hannula@bitwise.fi>2022-10-10 20:52:27 +0200
committerMarc Kleine-Budde <mkl@pengutronix.de>2022-10-27 09:00:39 +0200
commit2871edb32f4622c3a25ce4b3977bad9050b91974 (patch)
tree8f51d60ca1407fb026e87c447fa2a488c6fe682a /drivers/net/can/usb
parente2badb4bd33abe13ddc35975bd7f7f8693955a4b (diff)
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can: kvaser_usb: Fix possible completions during init_completion
kvaser_usb uses completions to signal when a response event is received for outgoing commands. However, it uses init_completion() to reinitialize the start_comp and stop_comp completions before sending the start/stop commands. In case the device sends the corresponding response just before the actual command is sent, complete() may be called concurrently with init_completion() which is not safe. This might be triggerable even with a properly functioning device by stopping the interface (CMD_STOP_CHIP) just after it goes bus-off (which also causes the driver to send CMD_STOP_CHIP when restart-ms is off), but that was not tested. Fix the issue by using reinit_completion() instead. Fixes: 080f40a6fa28 ("can: kvaser_usb: Add support for Kvaser CAN/USB devices") Tested-by: Jimmy Assarsson <extja@kvaser.com> Signed-off-by: Anssi Hannula <anssi.hannula@bitwise.fi> Signed-off-by: Jimmy Assarsson <extja@kvaser.com> Link: https://lore.kernel.org/all/20221010185237.319219-2-extja@kvaser.com Cc: stable@vger.kernel.org Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Diffstat (limited to 'drivers/net/can/usb')
-rw-r--r--drivers/net/can/usb/kvaser_usb/kvaser_usb_hydra.c4
-rw-r--r--drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c4
2 files changed, 4 insertions, 4 deletions
diff --git a/drivers/net/can/usb/kvaser_usb/kvaser_usb_hydra.c b/drivers/net/can/usb/kvaser_usb/kvaser_usb_hydra.c
index 7b52fda73d82..66f672ea631b 100644
--- a/drivers/net/can/usb/kvaser_usb/kvaser_usb_hydra.c
+++ b/drivers/net/can/usb/kvaser_usb/kvaser_usb_hydra.c
@@ -1875,7 +1875,7 @@ static int kvaser_usb_hydra_start_chip(struct kvaser_usb_net_priv *priv)
{
int err;
- init_completion(&priv->start_comp);
+ reinit_completion(&priv->start_comp);
err = kvaser_usb_hydra_send_simple_cmd(priv->dev, CMD_START_CHIP_REQ,
priv->channel);
@@ -1893,7 +1893,7 @@ static int kvaser_usb_hydra_stop_chip(struct kvaser_usb_net_priv *priv)
{
int err;
- init_completion(&priv->stop_comp);
+ reinit_completion(&priv->stop_comp);
/* Make sure we do not report invalid BUS_OFF from CMD_CHIP_STATE_EVENT
* see comment in kvaser_usb_hydra_update_state()
diff --git a/drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c b/drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c
index 50f2ac8319ff..19958037720f 100644
--- a/drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c
+++ b/drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c
@@ -1320,7 +1320,7 @@ static int kvaser_usb_leaf_start_chip(struct kvaser_usb_net_priv *priv)
{
int err;
- init_completion(&priv->start_comp);
+ reinit_completion(&priv->start_comp);
err = kvaser_usb_leaf_send_simple_cmd(priv->dev, CMD_START_CHIP,
priv->channel);
@@ -1338,7 +1338,7 @@ static int kvaser_usb_leaf_stop_chip(struct kvaser_usb_net_priv *priv)
{
int err;
- init_completion(&priv->stop_comp);
+ reinit_completion(&priv->stop_comp);
err = kvaser_usb_leaf_send_simple_cmd(priv->dev, CMD_STOP_CHIP,
priv->channel);