Message-Id: <200809052104.m85L49Pn020364@imap1.linux-foundation.org>
Date:	Fri, 05 Sep 2008 14:04:09 -0700
From:	akpm@...ux-foundation.org
To:	jeff@...zik.org
Cc:	netdev@...r.kernel.org, akpm@...ux-foundation.org, david@...es.net,
	alan@...rguk.ukuu.org.uk, anemo@....ocn.ne.jp,
	p_gortmaker@...oo.com
Subject: [patch for 2.6.27? 5/6] ne.c fix for hibernate and rmmod oops fix

From: David Fries <david@...es.net>

This ne2000 and the previous cr4 problem found when enabling suspend to
disk on my i486 with a PnP ISA NE2000 and Creative SB Live in the
trunk of my car.  It is providing in car podcast entertainment.  Must
be a unique setup.

Removing the module would cause a kernel oops as platform_driver_probe
failed to detect a device and unregistered the platform driver on module
init, and cleanup_module would unregister the already unregistered driver.
 The suspend and resume functions weren't being called and the network
card didn't function across a suspend to disk followed by a power cycle.

platform_driver support was added earlier, but without any
platform_device_register* calls I don't think it was being used.  Now all
devices are registered using platform_device_register_simple and pointers
are kept to unregister the ones that the probe failed for or unregister
all devices on module shutdown.  init_module no longer calls ne_init to
reduce confusion (and multiple unregister paths that caused the rmmod
oops).

With the devices now registered they are added to the platform driver and
get suspend and resume events.  A call to pnp_stop_dev and pnp_start_dev
now shutsdown and initializes plug and play devices.

netif_device_detach(dev) was added before unregister_netdev(dev) when
removing the region as occationally I would see a race condition where the
device was still being used in unregister_netdev.

Signed-off-by: David Fries <david@...es.net>
Cc: Atsushi Nemoto <anemo@....ocn.ne.jp>
Cc: Paul Gortmaker <p_gortmaker@...oo.com>
Cc: Alan Cox <alan@...rguk.ukuu.org.uk>
Cc: Jeff Garzik <jeff@...zik.org>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---

 drivers/net/ne.c |  277 +++++++++++++++++++++++++++------------------
 1 file changed, 172 insertions(+), 105 deletions(-)

diff -puN drivers/net/ne.c~nec-fix-for-hibernate-and-rmmod-oops-fix drivers/net/ne.c
--- a/drivers/net/ne.c~nec-fix-for-hibernate-and-rmmod-oops-fix
+++ a/drivers/net/ne.c
@@ -64,6 +64,27 @@ static const char version2[] =
 
 /* Do we support clones that don't adhere to 14,15 of the SAprom ? */
 #define SUPPORT_NE_BAD_CLONES
+/* 0xbad = bad sig or no reset ack */
+#define BAD 0xbad
+#define BAD_STR "0xbad"
+
+#define MAX_NE_CARDS	4	/* Max number of NE cards per module */
+static struct platform_device *pdev_ne[MAX_NE_CARDS];
+
+static int io[MAX_NE_CARDS];
+static int irq[MAX_NE_CARDS];
+static int bad[MAX_NE_CARDS];
+
+#ifdef MODULE
+module_param_array(io, int, NULL, 0);
+module_param_array(irq, int, NULL, 0);
+module_param_array(bad, int, NULL, 0);
+MODULE_PARM_DESC(io, "I/O base address(es),required");
+MODULE_PARM_DESC(irq, "IRQ number(s)");
+MODULE_PARM_DESC(bad, "Accept card(s) with bad signatures");
+MODULE_DESCRIPTION("NE1000/NE2000 ISA/PnP Ethernet driver");
+MODULE_LICENSE("GPL");
+#endif /* MODULE */
 
 /* Do we perform extra sanity checks on stuff ? */
 /* #define NE_SANITY_CHECK */
@@ -162,7 +183,6 @@ static void ne_block_input(struct net_de
 static void ne_block_output(struct net_device *dev, const int count,
 		const unsigned char *buf, const int start_page);
 
-
 /*  Probe for various non-shared-memory ethercards.
 
    NEx000-clone boards have a Station Address PROM (SAPROM) in the packet
@@ -192,8 +212,13 @@ static int __init do_ne_probe(struct net
 #endif
 
 	/* First check any supplied i/o locations. User knows best. <cough> */
-	if (base_addr > 0x1ff)	/* Check a single specified location. */
-		return ne_probe1(dev, base_addr);
+	if (base_addr > 0x1ff) {	/* Check a single specified location. */
+		int ret = ne_probe1(dev, base_addr);
+		if (ret)
+			printk(KERN_WARNING "ne.c: No NE*000 card found at "
+				"i/o = %#lx\n", base_addr);
+		return ret;
+	}
 	else if (base_addr != 0)	/* Don't probe at all. */
 		return -ENXIO;
 
@@ -214,28 +239,6 @@ static int __init do_ne_probe(struct net
 	return -ENODEV;
 }
 
-#ifndef MODULE
-struct net_device * __init ne_probe(int unit)
-{
-	struct net_device *dev = alloc_eip_netdev();
-	int err;
-
-	if (!dev)
-		return ERR_PTR(-ENOMEM);
-
-	sprintf(dev->name, "eth%d", unit);
-	netdev_boot_setup_check(dev);
-
-	err = do_ne_probe(dev);
-	if (err)
-		goto out;
-	return dev;
-out:
-	free_netdev(dev);
-	return ERR_PTR(err);
-}
-#endif
-
 static int __init ne_probe_isapnp(struct net_device *dev)
 {
 	int i;
@@ -329,7 +332,7 @@ static int __init ne_probe1(struct net_d
 	   with an otherwise unused dev->mem_end value of "0xBAD" will
 	   cause the driver to skip these parts of the probe. */
 
-	bad_card = ((dev->base_addr != 0) && (dev->mem_end == 0xbad));
+	bad_card = ((dev->base_addr != 0) && (dev->mem_end == BAD));
 
 	/* Reset card. Who knows what dain-bramaged state it was left in. */
 
@@ -472,7 +475,7 @@ static int __init ne_probe1(struct net_d
 		outb_p(0x00, ioaddr + EN0_RCNTLO);
 		outb_p(0x00, ioaddr + EN0_RCNTHI);
 		outb_p(E8390_RREAD+E8390_START, ioaddr); /* Trigger it... */
-		mdelay(10);		/* wait 10ms for interrupt to propagate */
+		mdelay(10);	/* wait 10ms for interrupt to propagate */
 		outb_p(0x00, ioaddr + EN0_IMR); 		/* Mask it again. */
 		dev->irq = probe_irq_off(cookie);
 		if (ei_debug > 2)
@@ -807,18 +810,20 @@ static int __init ne_drv_probe(struct pl
 {
 	struct net_device *dev;
 	struct resource *res;
-	int err, irq;
+	int err, r_irq;
 
 	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
-	irq = platform_get_irq(pdev, 0);
-	if (!res || irq < 0)
+	r_irq = platform_get_irq(pdev, 0);
+	if (!res || r_irq < 0)
 		return -ENODEV;
 
 	dev = alloc_eip_netdev();
 	if (!dev)
 		return -ENOMEM;
-	dev->irq = irq;
+	dev->irq = r_irq;
 	dev->base_addr = res->start;
+	if (!strcmp(res->name, BAD_STR))
+		dev->mem_end = BAD;
 	err = do_ne_probe(dev);
 	if (err) {
 		free_netdev(dev);
@@ -828,24 +833,56 @@ static int __init ne_drv_probe(struct pl
 	return 0;
 }
 
-static int __exit ne_drv_remove(struct platform_device *pdev)
+static int ne_drv_remove(struct platform_device *pdev)
 {
 	struct net_device *dev = platform_get_drvdata(pdev);
 
-	unregister_netdev(dev);
-	free_irq(dev->irq, dev);
-	release_region(dev->base_addr, NE_IO_EXTENT);
-	free_netdev(dev);
+	if (dev) {
+		struct pnp_dev *idev = (struct pnp_dev *)ei_status.priv;
+		netif_device_detach(dev);
+		unregister_netdev(dev);
+		if (idev)
+			pnp_device_detach(idev);
+		/* Careful ne_drv_remove can be called twice, once from
+		 * the platform_driver.remove and again when the
+		 * platform_device is being removed.
+		 */
+		ei_status.priv = 0;
+		free_irq(dev->irq, dev);
+		release_region(dev->base_addr, NE_IO_EXTENT);
+		free_netdev(dev);
+		platform_set_drvdata(pdev, NULL);
+	}
 	return 0;
 }
 
+/* Remove unused devices or all if true. */
+static void ne_loop_rm_unreg(int all)
+{
+	int this_dev;
+	struct platform_device *pdev;
+	for (this_dev = 0; this_dev < MAX_NE_CARDS; this_dev++) {
+		pdev = pdev_ne[this_dev];
+		/* No network device == unused */
+		if (pdev && (!platform_get_drvdata(pdev) || all)) {
+			ne_drv_remove(pdev);
+			platform_device_unregister(pdev);
+			pdev_ne[this_dev] = NULL;
+		}
+	}
+}
+
 #ifdef CONFIG_PM
 static int ne_drv_suspend(struct platform_device *pdev, pm_message_t state)
 {
 	struct net_device *dev = platform_get_drvdata(pdev);
 
-	if (netif_running(dev))
+	if (netif_running(dev)) {
+		struct pnp_dev *idev = (struct pnp_dev *)ei_status.priv;
 		netif_device_detach(dev);
+		if (idev)
+			pnp_stop_dev(idev);
+	}
 	return 0;
 }
 
@@ -854,6 +891,9 @@ static int ne_drv_resume(struct platform
 	struct net_device *dev = platform_get_drvdata(pdev);
 
 	if (netif_running(dev)) {
+		struct pnp_dev *idev = (struct pnp_dev *)ei_status.priv;
+		if (idev)
+			pnp_start_dev(idev);
 		ne_reset_8390(dev);
 		NS8390p_init(dev, 1);
 		netif_device_attach(dev);
@@ -866,7 +906,7 @@ static int ne_drv_resume(struct platform
 #endif
 
 static struct platform_driver ne_driver = {
-	.remove		= __exit_p(ne_drv_remove),
+	.remove		= ne_drv_remove,
 	.suspend	= ne_drv_suspend,
 	.resume		= ne_drv_resume,
 	.driver		= {
@@ -875,91 +915,118 @@ static struct platform_driver ne_driver 
 	},
 };
 
-static int __init ne_init(void)
-{
-	return platform_driver_probe(&ne_driver, ne_drv_probe);
-}
-
-static void __exit ne_exit(void)
-{
-	platform_driver_unregister(&ne_driver);
-}
-
-#ifdef MODULE
-#define MAX_NE_CARDS	4	/* Max number of NE cards per module */
-static struct net_device *dev_ne[MAX_NE_CARDS];
-static int io[MAX_NE_CARDS];
-static int irq[MAX_NE_CARDS];
-static int bad[MAX_NE_CARDS];	/* 0xbad = bad sig or no reset ack */
-
-module_param_array(io, int, NULL, 0);
-module_param_array(irq, int, NULL, 0);
-module_param_array(bad, int, NULL, 0);
-MODULE_PARM_DESC(io, "I/O base address(es),required");
-MODULE_PARM_DESC(irq, "IRQ number(s)");
-MODULE_PARM_DESC(bad, "Accept card(s) with bad signatures");
-MODULE_DESCRIPTION("NE1000/NE2000 ISA/PnP Ethernet driver");
-MODULE_LICENSE("GPL");
-
 /* This is set up so that no ISA autoprobe takes place. We can't guarantee
 that the ne2k probe is the last 8390 based probe to take place (as it
 is at boot) and so the probe will get confused by any other 8390 cards.
 ISA device autoprobes on a running machine are not recommended anyway. */
 
-int __init init_module(void)
+/* Register platform devices for each non-zero io[] (and one 0 io for probe
+ * or pnp probing), then probe to see if we found any.
+ */
+static void __init ne_add_devices(void)
 {
-	int this_dev, found = 0;
-	int plat_found = !ne_init();
+	int this_dev;
+	int probed_zero = 0;
+	struct platform_device *pdev;
 
 	for (this_dev = 0; this_dev < MAX_NE_CARDS; this_dev++) {
-		struct net_device *dev = alloc_eip_netdev();
-		if (!dev)
-			break;
-		dev->irq = irq[this_dev];
-		dev->mem_end = bad[this_dev];
-		dev->base_addr = io[this_dev];
-		if (do_ne_probe(dev) == 0) {
-			dev_ne[found++] = dev;
-			continue;
+		struct resource r[2] = {
+			{
+				.start = io[this_dev],
+				.end = io[this_dev]+NE_IO_EXTENT-1,
+				.flags = IORESOURCE_IO},
+			{
+				.start = irq[this_dev],
+				.flags = IORESOURCE_IRQ} };
+		/* probe zero once */
+		if (io[this_dev] == 0) {
+			if (probed_zero)
+				continue;
+			probed_zero = 1;
 		}
-		free_netdev(dev);
-		if (found || plat_found)
-			break;
-		if (io[this_dev] != 0)
-			printk(KERN_WARNING "ne.c: No NE*000 card found at i/o = %#x\n", io[this_dev]);
-		else
-			printk(KERN_NOTICE "ne.c: You must supply \"io=0xNNN\" value(s) for ISA cards.\n");
-		return -ENXIO;
+		if (pdev_ne[this_dev])
+			continue;
+		if (bad[this_dev] == BAD)
+			r[0].name = BAD_STR;
+		pdev = platform_device_register_simple(
+			DRV_NAME, this_dev, r, ARRAY_SIZE(r));
+		if (IS_ERR(pdev))
+			continue;
+		pdev_ne[this_dev] = pdev;
 	}
-	if (found || plat_found)
-		return 0;
-	return -ENODEV;
 }
 
-static void cleanup_card(struct net_device *dev)
+#ifdef MODULE
+int __init init_module()
 {
-	struct pnp_dev *idev = (struct pnp_dev *)ei_status.priv;
-	if (idev)
-		pnp_device_detach(idev);
-	free_irq(dev->irq, dev);
-	release_region(dev->base_addr, NE_IO_EXTENT);
+	int retval;
+	ne_add_devices();
+	retval = platform_driver_probe(&ne_driver, ne_drv_probe);
+	if (retval) {
+		if (io[0] == 0)
+			printk(KERN_NOTICE "ne.c: You must supply \"io=0xNNN\""
+				" value(s) for ISA cards.\n");
+		ne_loop_rm_unreg(1);
+		return retval;
+	}
+
+	/* Unregister unused platform_devices. */
+	ne_loop_rm_unreg(0);
+	return retval;
 }
+#else /* MODULE */
+static int __init ne_init(void)
+{
+	int retval = platform_driver_probe(&ne_driver, ne_drv_probe);
 
-void __exit cleanup_module(void)
+	/* Unregister unused platform_devices. */
+	ne_loop_rm_unreg(0);
+	return retval;
+}
+module_init(ne_init);
+
+struct net_device * __init ne_probe(int unit)
 {
 	int this_dev;
+	struct net_device *dev;
+	struct platform_device *pdev;
 
-	ne_exit();
-	for (this_dev = 0; this_dev < MAX_NE_CARDS; this_dev++) {
-		struct net_device *dev = dev_ne[this_dev];
-		if (dev) {
-			unregister_netdev(dev);
-			cleanup_card(dev);
-			free_netdev(dev);
-		}
+	/* Find an empty slot. */
+	this_dev = 0;
+	while (pdev_ne[this_dev] || io[this_dev]) {
+		if (++this_dev == MAX_NE_CARDS)
+			return ERR_PTR(-ENOMEM);
 	}
+
+	/* Get irq, io from kernel command line */
+	dev = alloc_eip_netdev();
+	if (!dev)
+		return ERR_PTR(-ENOMEM);
+
+	sprintf(dev->name, "eth%d", unit);
+	netdev_boot_setup_check(dev);
+
+	io[this_dev] = dev->base_addr;
+	irq[this_dev] = dev->irq;
+	bad[this_dev] = dev->mem_end;
+
+	free_netdev(dev);
+
+	ne_add_devices();
+
+	/* return the first device found */
+	for (this_dev = 0; this_dev < MAX_NE_CARDS; this_dev++)
+		if ((pdev = pdev_ne[this_dev]) &&
+			(dev = platform_get_drvdata(pdev)))
+			return dev;
+
+	return ERR_PTR(-ENODEV);
 }
-#else /* MODULE */
-module_init(ne_init);
-module_exit(ne_exit);
 #endif /* MODULE */
+
+static void __exit ne_exit(void)
+{
+	platform_driver_unregister(&ne_driver);
+	ne_loop_rm_unreg(1);
+}
+module_exit(ne_exit);
_
--
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