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can: esd_usb: Make use of can_change_state() and relocate checking skb for NULL 

[ Upstream commit 9684b000a8 ]

Start a rework initiated by Vincents remarks "You should not report
the greatest of txerr and rxerr but the one which actually increased."
[1] and "As far as I understand, those flags should be set only when
the threshold is reached" [2] .

Therefore make use of can_change_state() to (among others) set the
flags CAN_ERR_CRTL_[RT]X_WARNING and CAN_ERR_CRTL_[RT]X_PASSIVE,
maintain CAN statistic counters for error_warning, error_passive and
bus_off.

Relocate testing alloc_can_err_skb() for NULL to the end of
esd_usb_rx_event(), to have things like can_bus_off(),
can_change_state() working even in out of memory conditions.

Fixes: 96d8e90382 ("can: Add driver for esd CAN-USB/2 device")
Signed-off-by: Frank Jungclaus <frank.jungclaus@esd.eu>
Link: [1] https://lore.kernel.org/all/CAMZ6RqKGBWe15aMkf8-QLf-cOQg99GQBebSm+1wEzTqHgvmNuw@mail.gmail.com/
Link: [2] https://lore.kernel.org/all/CAMZ6Rq+QBO1yTX_o6GV0yhdBj-RzZSRGWDZBS0fs7zbSTy4hmA@mail.gmail.com/
Link: https://lore.kernel.org/all/20230216190450.3901254-3-frank.jungclaus@esd.eu
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Frank Jungclaus 2023-02-16 20:04:49 +01:00 committed by Greg Kroah-Hartman
parent 08d2f67795
commit ccf81ec1f1
1 changed files with 25 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

50
drivers/net/can/usb/esd_usb.c
View File

@ -239,41 +239,42 @@ static void esd_usb_rx_event(struct esd_usb_net_priv *priv,
msg->msg.rx.dlc, state, ecc, rxerr, txerr);
skb = alloc_can_err_skb(priv->netdev, &cf);
if (skb == NULL) {
stats->rx_dropped++;
return;
}
if (state != priv->old_state) {
enum can_state tx_state, rx_state;
enum can_state new_state = CAN_STATE_ERROR_ACTIVE;
priv->old_state = state;
switch (state & ESD_BUSSTATE_MASK) {
case ESD_BUSSTATE_BUSOFF:
priv->can.state = CAN_STATE_BUS_OFF;
cf->can_id |= CAN_ERR_BUSOFF;
priv->can.can_stats.bus_off++;
new_state = CAN_STATE_BUS_OFF;
can_bus_off(priv->netdev);
break;
case ESD_BUSSTATE_WARN:
priv->can.state = CAN_STATE_ERROR_WARNING;
priv->can.can_stats.error_warning++;
new_state = CAN_STATE_ERROR_WARNING;
break;
case ESD_BUSSTATE_ERRPASSIVE:
priv->can.state = CAN_STATE_ERROR_PASSIVE;
priv->can.can_stats.error_passive++;
new_state = CAN_STATE_ERROR_PASSIVE;
break;
default:
priv->can.state = CAN_STATE_ERROR_ACTIVE;
new_state = CAN_STATE_ERROR_ACTIVE;
txerr = 0;
rxerr = 0;
break;
}
} else {
if (new_state != priv->can.state) {
tx_state = (txerr >= rxerr) ? new_state : 0;
rx_state = (txerr <= rxerr) ? new_state : 0;
can_change_state(priv->netdev, cf,
tx_state, rx_state);
}
} else if (skb) {
priv->can.can_stats.bus_error++;
stats->rx_errors++;
cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR |
CAN_ERR_CNT;
cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
switch (ecc & SJA1000_ECC_MASK) {
case SJA1000_ECC_BIT:
@ -295,21 +296,20 @@ static void esd_usb_rx_event(struct esd_usb_net_priv *priv,
/* Bit stream position in CAN frame as the error was detected */
cf->data[3] = ecc & SJA1000_ECC_SEG;
if (priv->can.state == CAN_STATE_ERROR_WARNING ||
priv->can.state == CAN_STATE_ERROR_PASSIVE) {
cf->data[1] = (txerr > rxerr) ?
CAN_ERR_CRTL_TX_PASSIVE :
CAN_ERR_CRTL_RX_PASSIVE;
}
cf->data[6] = txerr;
cf->data[7] = rxerr;
}
priv->bec.txerr = txerr;
priv->bec.rxerr = rxerr;
netif_rx(skb);
if (skb) {
cf->can_id |= CAN_ERR_CNT;
cf->data[6] = txerr;
cf->data[7] = rxerr;
netif_rx(skb);
} else {
stats->rx_dropped++;
}
}
}