Merge tag 'linux-can-fixes-for-5.18-20220429' of...

Merge tag 'linux-can-fixes-for-5.18-20220429' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can

Marc Kleine-Budde says:

====================
pull-request: can 2022-04-29

The first patch is by Oliver Hartkopp and removes the ability to
re-binding bounds sockets from the ISOTP. It turned out to be not
needed and brings unnecessary complexity.

The last 4 patches all target the grcan driver. Duoming Zhou's patch
fixes a potential dead lock in the grcan_close() function. Daniel
Hellstrom's patch fixes the dma_alloc_coherent() to use the correct
device. Andreas Larsson's 1st patch fixes a broken system id check,
the 2nd patch fixes the NAPI poll budget usage.

* tag 'linux-can-fixes-for-5.18-20220429' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can:
  can: grcan: only use the NAPI poll budget for RX
  can: grcan: grcan_probe(): fix broken system id check for errata workaround needs
  can: grcan: use ofdev->dev when allocating DMA memory
  can: grcan: grcan_close(): fix deadlock
  can: isotp: remove re-binding of bound socket
====================

Link: https://lore.kernel.org/r/20220429125612.1792561-1-mkl@pengutronix.deSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/can/grcan.c

@@ -241,13 +241,14 @@ struct grcan_device_config {
 		.rxsize		= GRCAN_DEFAULT_BUFFER_SIZE,	\
 		}
 
-#define GRCAN_TXBUG_SAFE_GRLIB_VERSION	0x4100
+#define GRCAN_TXBUG_SAFE_GRLIB_VERSION	4100
 #define GRLIB_VERSION_MASK		0xffff
 
 /* GRCAN private data structure */
 struct grcan_priv {
 	struct can_priv can;	/* must be the first member */
 	struct net_device *dev;
+	struct device *ofdev_dev;
 	struct napi_struct napi;
 
 	struct grcan_registers __iomem *regs;	/* ioremap'ed registers */
@@ -921,7 +922,7 @@ static void grcan_free_dma_buffers(struct net_device *dev)
 	struct grcan_priv *priv = netdev_priv(dev);
 	struct grcan_dma *dma = &priv->dma;
 
-	dma_free_coherent(&dev->dev, dma->base_size, dma->base_buf,
+	dma_free_coherent(priv->ofdev_dev, dma->base_size, dma->base_buf,
 			  dma->base_handle);
 	memset(dma, 0, sizeof(*dma));
 }
@@ -946,7 +947,7 @@ static int grcan_allocate_dma_buffers(struct net_device *dev,
 
 	/* Extra GRCAN_BUFFER_ALIGNMENT to allow for alignment */
 	dma->base_size = lsize + ssize + GRCAN_BUFFER_ALIGNMENT;
-	dma->base_buf = dma_alloc_coherent(&dev->dev,
+	dma->base_buf = dma_alloc_coherent(priv->ofdev_dev,
 					   dma->base_size,
 					   &dma->base_handle,
 					   GFP_KERNEL);
@@ -1102,8 +1103,10 @@ static int grcan_close(struct net_device *dev)
 
 	priv->closing = true;
 	if (priv->need_txbug_workaround) {
+		spin_unlock_irqrestore(&priv->lock, flags);
 		del_timer_sync(&priv->hang_timer);
 		del_timer_sync(&priv->rr_timer);
+		spin_lock_irqsave(&priv->lock, flags);
 	}
 	netif_stop_queue(dev);
 	grcan_stop_hardware(dev);
@@ -1122,7 +1125,7 @@ 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;
@@ -1130,7 +1133,7 @@ static int grcan_transmit_catch_up(struct net_device *dev, int budget)
 
 	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))
@@ -1144,8 +1147,6 @@ 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)
@@ -1227,19 +1228,13 @@ 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
@@ -1256,7 +1251,7 @@ 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,
@@ -1587,6 +1582,7 @@ static int grcan_setup_netdev(struct platform_device *ofdev,
 	memcpy(&priv->config, &grcan_module_config,
 	       sizeof(struct grcan_device_config));
 	priv->dev = dev;
+	priv->ofdev_dev = &ofdev->dev;
 	priv->regs = base;
 	priv->can.bittiming_const = &grcan_bittiming_const;
 	priv->can.do_set_bittiming = grcan_set_bittiming;
@@ -1639,6 +1635,7 @@ static int grcan_setup_netdev(struct platform_device *ofdev,
 static int grcan_probe(struct platform_device *ofdev)
 {
 	struct device_node *np = ofdev->dev.of_node;
+	struct device_node *sysid_parent;
 	u32 sysid, ambafreq;
 	int irq, err;
 	void __iomem *base;
@@ -1647,10 +1644,15 @@ static int grcan_probe(struct platform_device *ofdev)
 	/* Compare GRLIB version number with the first that does not
 	 * have the tx bug (see start_xmit)
 	 */
-	err = of_property_read_u32(np, "systemid", &sysid);
-	if (!err && ((sysid & GRLIB_VERSION_MASK)
-		     >= GRCAN_TXBUG_SAFE_GRLIB_VERSION))
+	sysid_parent = of_find_node_by_path("/ambapp0");
+	if (sysid_parent) {
+		of_node_get(sysid_parent);
+		err = of_property_read_u32(sysid_parent, "systemid", &sysid);
+		if (!err && ((sysid & GRLIB_VERSION_MASK) >=
+			     GRCAN_TXBUG_SAFE_GRLIB_VERSION))
 			txbug = false;
+		of_node_put(sysid_parent);
+	}
 
 	err = of_property_read_u32(np, "freq", &ambafreq);
 	if (err) {

net/can/isotp.c

@@ -1189,6 +1189,11 @@ static int isotp_bind(struct socket *sock, struct sockaddr *uaddr, int len)
 
 	lock_sock(sk);
 
+	if (so->bound) {
+		err = -EINVAL;
+		goto out;
+	}
+
 	/* do not register frame reception for functional addressing */
 	if (so->opt.flags & CAN_ISOTP_SF_BROADCAST)
 		do_rx_reg = 0;
@@ -1199,10 +1204,6 @@ static int isotp_bind(struct socket *sock, struct sockaddr *uaddr, int len)
 		goto out;
 	}
 
-	if (so->bound && addr->can_ifindex == so->ifindex &&
-	    rx_id == so->rxid && tx_id == so->txid)
-		goto out;
-
 	dev = dev_get_by_index(net, addr->can_ifindex);
 	if (!dev) {
 		err = -ENODEV;
@@ -1237,22 +1238,6 @@ static int isotp_bind(struct socket *sock, struct sockaddr *uaddr, int len)
 
 	dev_put(dev);
 
-	if (so->bound && do_rx_reg) {
-		/* unregister old filter */
-		if (so->ifindex) {
-			dev = dev_get_by_index(net, so->ifindex);
-			if (dev) {
-				can_rx_unregister(net, dev, so->rxid,
-						  SINGLE_MASK(so->rxid),
-						  isotp_rcv, sk);
-				can_rx_unregister(net, dev, so->txid,
-						  SINGLE_MASK(so->txid),
-						  isotp_rcv_echo, sk);
-				dev_put(dev);
-			}
-		}
-	}
-
 	/* switch to new settings */
 	so->ifindex = ifindex;
 	so->rxid = rx_id;