Skip to content

Commit

Permalink
can: grcan: only use the NAPI poll budget for RX
Browse files Browse the repository at this point in the history
commit 2873d4d upstream.

The previous split budget between TX and RX made it return not using
the entire budget but at the same time not having calling called
napi_complete. This sometimes led to the poll to not be called, and at
the same time having TX and RX interrupts disabled resulting in the
driver getting stuck.

Fixes: 6cec9b0 ("can: grcan: Add device driver for GRCAN and GRHCAN cores")
Link: https://lore.kernel.org/all/20220429084656.29788-4-andreas@gaisler.com
Cc: stable@vger.kernel.org
Signed-off-by: Andreas Larsson <andreas@gaisler.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  • Loading branch information
andreas-gaisler authored and gregkh committed May 12, 2022
1 parent ab5adbc commit 56a5ff9
Showing 1 changed file with 7 additions and 15 deletions.
22 changes: 7 additions & 15 deletions drivers/net/can/grcan.c
Expand Up @@ -1137,15 +1137,15 @@ static int grcan_close(struct net_device *dev)
return 0;
}

static int grcan_transmit_catch_up(struct net_device *dev, int budget)
static void grcan_transmit_catch_up(struct net_device *dev)
{
struct grcan_priv *priv = netdev_priv(dev);
unsigned long flags;
int work_done;

spin_lock_irqsave(&priv->lock, flags);

work_done = catch_up_echo_skb(dev, budget, true);
work_done = catch_up_echo_skb(dev, -1, true);
if (work_done) {
if (!priv->resetting && !priv->closing &&
!(priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY))
Expand All @@ -1159,8 +1159,6 @@ static int grcan_transmit_catch_up(struct net_device *dev, int budget)
}

spin_unlock_irqrestore(&priv->lock, flags);

return work_done;
}

static int grcan_receive(struct net_device *dev, int budget)
Expand Down Expand Up @@ -1242,19 +1240,13 @@ static int grcan_poll(struct napi_struct *napi, int budget)
struct net_device *dev = priv->dev;
struct grcan_registers __iomem *regs = priv->regs;
unsigned long flags;
int tx_work_done, rx_work_done;
int rx_budget = budget / 2;
int tx_budget = budget - rx_budget;
int work_done;

/* Half of the budget for receiving messages */
rx_work_done = grcan_receive(dev, rx_budget);
work_done = grcan_receive(dev, budget);

/* Half of the budget for transmitting messages as that can trigger echo
* frames being received
*/
tx_work_done = grcan_transmit_catch_up(dev, tx_budget);
grcan_transmit_catch_up(dev);

if (rx_work_done < rx_budget && tx_work_done < tx_budget) {
if (work_done < budget) {
napi_complete(napi);

/* Guarantee no interference with a running reset that otherwise
Expand All @@ -1271,7 +1263,7 @@ static int grcan_poll(struct napi_struct *napi, int budget)
spin_unlock_irqrestore(&priv->lock, flags);
}

return rx_work_done + tx_work_done;
return work_done;
}

/* Work tx bug by waiting while for the risky situation to clear. If that fails,
Expand Down

0 comments on commit 56a5ff9

Please sign in to comment.