litmus-rt.git - The LITMUS^RT kernel.

The LITMUS^RT kernel.

Bjoern Brandenburg

about summary refs log tree commit diff stats

diff options

author	Tejun Heo <tj@kernel.org>	2009-09-28 20:17:58 -0400
committer	Tejun Heo <tj@kernel.org>	2009-09-28 20:17:58 -0400
commit	f2badb0c950ed308be9b321203b9c8d341690cd4 (patch)
tree	5da0e7493192f97be604e257fd10847ae3a27504 /fs/xfs/xfs_utils.h
parent	635b75fc18858d3522e481c043de764766db923c (diff)

percpu: make allocation failures more verbose

Warn and dump stack when percpu allocation fails. percpu allocator is still young and unchecked NULL percpu pointer usage can result in random memory corruption when combined with the pointer shifting in access macros. Allocation failures should be rare and the warning message will be disabled after certain times. Signed-off-by: Tejun Heo <tj@kernel.org>

Diffstat (limited to 'fs/xfs/xfs_utils.h')

0 files changed, 0 insertions, 0 deletions

ic License version 2 (the "GPL"), in * which case the provisions of the GPL are applicable instead of the * above. If you wish to allow the use of your version of this file * only under the terms of the GPL and not to allow others to use your * version of this file under the MPL, indicate your decision by * deleting the provisions above and replace them with the notice and * other provisions required by the GPL. If you do not delete the * provisions above, a recipient may use your version of this file * under either the MPL or the GPL. * * The actual driving is done by orinoco.c, this is just resource * allocation stuff. * * This driver is modeled after the orinoco_plx driver. The main * difference is that the TMD chip has only IO port ranges and doesn't * provide access to the PCMCIA attribute space. * * Pheecom sells cards with the TMD chip as "ASIC version" */ #define DRIVER_NAME "orinoco_tmd" #define PFX DRIVER_NAME ": " #include <linux/module.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/delay.h> #include <linux/pci.h> #include <pcmcia/cisreg.h> #include "orinoco.h" #include "orinoco_pci.h" #define COR_VALUE (COR_LEVEL_REQ | COR_FUNC_ENA) /* Enable PC card with interrupt in level trigger */ #define COR_RESET (0x80) /* reset bit in the COR register */ #define TMD_RESET_TIME (500) /* milliseconds */ /* * Do a soft reset of the card using the Configuration Option Register */ static int orinoco_tmd_cor_reset(struct orinoco_private *priv) { hermes_t *hw = &priv->hw; struct orinoco_pci_card *card = priv->card; unsigned long timeout; u16 reg; iowrite8(COR_VALUE | COR_RESET, card->bridge_io); mdelay(1); iowrite8(COR_VALUE, card->bridge_io); mdelay(1); /* Just in case, wait more until the card is no longer busy */ timeout = jiffies + (TMD_RESET_TIME * HZ / 1000); reg = hermes_read_regn(hw, CMD); while (time_before(jiffies, timeout) && (reg & HERMES_CMD_BUSY)) { mdelay(1); reg = hermes_read_regn(hw, CMD); } /* Still busy? */ if (reg & HERMES_CMD_BUSY) { printk(KERN_ERR PFX "Busy timeout\n"); return -ETIMEDOUT; } return 0; } static int orinoco_tmd_init_one(struct pci_dev *pdev, const struct pci_device_id *ent) { int err; struct orinoco_private *priv; struct orinoco_pci_card *card; struct net_device *dev; void __iomem *hermes_io, *bridge_io; err = pci_enable_device(pdev); if (err) { printk(KERN_ERR PFX "Cannot enable PCI device\n"); return err; } err = pci_request_regions(pdev, DRIVER_NAME); if (err) { printk(KERN_ERR PFX "Cannot obtain PCI resources\n"); goto fail_resources; } bridge_io = pci_iomap(pdev, 1, 0); if (!bridge_io) { printk(KERN_ERR PFX "Cannot map bridge registers\n"); err = -EIO; goto fail_map_bridge; } hermes_io = pci_iomap(pdev, 2, 0); if (!hermes_io) { printk(KERN_ERR PFX "Cannot map chipset registers\n"); err = -EIO; goto fail_map_hermes; } /* Allocate network device */ dev = alloc_orinocodev(sizeof(*card), orinoco_tmd_cor_reset); if (!dev) { printk(KERN_ERR PFX "Cannot allocate network device\n"); err = -ENOMEM; goto fail_alloc; } priv = netdev_priv(dev); card = priv->card; card->bridge_io = bridge_io; SET_NETDEV_DEV(dev, &pdev->dev); hermes_struct_init(&priv->hw, hermes_io, HERMES_16BIT_REGSPACING); err = request_irq(pdev->irq, orinoco_interrupt, IRQF_SHARED, dev->name, dev); if (err) { printk(KERN_ERR PFX "Cannot allocate IRQ %d\n", pdev->irq); err = -EBUSY; goto fail_irq; } err = orinoco_tmd_cor_reset(priv); if (err) { printk(KERN_ERR PFX "Initial reset failed\n"); goto fail; } err = register_netdev(dev); if (err) { printk(KERN_ERR PFX "Cannot register network device\n"); goto fail; } pci_set_drvdata(pdev, dev); printk(KERN_DEBUG "%s: " DRIVER_NAME " at %s\n", dev->name, pci_name(pdev)); return 0; fail: free_irq(pdev->irq, dev); fail_irq: pci_set_drvdata(pdev, NULL); free_orinocodev(dev); fail_alloc: pci_iounmap(pdev, hermes_io); fail_map_hermes: pci_iounmap(pdev, bridge_io); fail_map_bridge: pci_release_regions(pdev); fail_resources: pci_disable_device(pdev); return err; } static void __devexit orinoco_tmd_remove_one(struct pci_dev *pdev) { struct net_device *dev = pci_get_drvdata(pdev); struct orinoco_private *priv = netdev_priv(dev); struct orinoco_pci_card *card = priv->card; unregister_netdev(dev); free_irq(pdev->irq, dev); pci_set_drvdata(pdev, NULL); free_orinocodev(dev); pci_iounmap(pdev, priv->hw.iobase); pci_iounmap(pdev, card->bridge_io); pci_release_regions(pdev); pci_disable_device(pdev); } static struct pci_device_id orinoco_tmd_id_table[] = { {0x15e8, 0x0131, PCI_ANY_ID, PCI_ANY_ID,}, /* NDC and OEMs, e.g. pheecom */ {0,}, }; MODULE_DEVICE_TABLE(pci, orinoco_tmd_id_table); static struct pci_driver orinoco_tmd_driver = { .name = DRIVER_NAME, .id_table = orinoco_tmd_id_table, .probe = orinoco_tmd_init_one, .remove = __devexit_p(orinoco_tmd_remove_one), .suspend = orinoco_pci_suspend, .resume = orinoco_pci_resume, }; static char version[] __initdata = DRIVER_NAME " " DRIVER_VERSION " (Joerg Dorchain <joerg@dorchain.net>)"; MODULE_AUTHOR("Joerg Dorchain <joerg@dorchain.net>"); MODULE_DESCRIPTION("Driver for wireless LAN cards using the TMD7160 PCI bridge"); MODULE_LICENSE("Dual MPL/GPL"); static int __init orinoco_tmd_init(void) { printk(KERN_DEBUG "%s\n", version); return pci_register_driver(&orinoco_tmd_driver); } static void __exit orinoco_tmd_exit(void) { pci_unregister_driver(&orinoco_tmd_driver); } module_init(orinoco_tmd_init); module_exit(orinoco_tmd_exit); /* * Local variables: * c-indent-level: 8 * c-basic-offset: 8 * tab-width: 8 * End: */


context:
space:
mode: