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The LITMUS^RT kernel.

Bjoern Brandenburg

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author	Josef Bacik <jbacik@fusionio.com>	2013-03-29 10:09:34 -0400
committer	Chris Mason <chris.mason@fusionio.com>	2013-03-29 10:18:59 -0400
commit	d8fe29e9dea8d7d61fd140d8779326856478fc62 (patch)
tree	fb5867b3c130d23305a2fec87eed49708d5e7cdc /fs/btrfs/inode.c
parent	82d130ff390be67d980d8b6f39e921c0b1d8d8e0 (diff)

Btrfs: don't drop path when printing out tree errors in scrub

A user reported a panic where we were panicing somewhere in tree_backref_for_extent from scrub_print_warning. He only captured the trace but looking at scrub_print_warning we drop the path right before we mess with the extent buffer to print out a bunch of stuff, which isn't right. So fix this by dropping the path after we use the eb if we need to. Thanks, Cc: stable@vger.kernel.org Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>

Diffstat (limited to 'fs/btrfs/inode.c')

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/*      cops.c: LocalTalk driver for Linux.
 *
 *	Authors:
 *      - Jay Schulist <jschlst@samba.org>
 *
 *	With more than a little help from;
 *	- Alan Cox <Alan.Cox@linux.org> 
 *
 *      Derived from:
 *      - skeleton.c: A network driver outline for linux.
 *        Written 1993-94 by Donald Becker.
 *	- ltpc.c: A driver for the LocalTalk PC card.
 *	  Written by Bradford W. Johnson.
 *
 *      Copyright 1993 United States Government as represented by the
 *      Director, National Security Agency.
 *
 *      This software may be used and distributed according to the terms
 *      of the GNU General Public License, incorporated herein by reference.
 *
 *	Changes:
 *	19970608	Alan Cox	Allowed dual card type support
 *					Can set board type in insmod
 *					Hooks for cops_setup routine
 *					(not yet implemented).
 *	19971101	Jay Schulist	Fixes for multiple lt* devices.
 *	19980607	Steven Hirsch	Fixed the badly broken support
 *					for Tangent type cards. Only
 *                                      tested on Daystar LT200. Some
 *                                      cleanup of formatting and program
 *                                      logic.  Added emacs 'local-vars'
 *                                      setup for Jay's brace style.
 *	20000211	Alan Cox	Cleaned up for softnet
 */

static const char *version =
"cops.c:v0.04 6/7/98 Jay Schulist <jschlst@samba.org>\n";
/*
 *  Sources:
 *      COPS Localtalk SDK. This provides almost all of the information
 *      needed.
 */

/*
 * insmod/modprobe configurable stuff.
 *	- IO Port, choose one your card supports or 0 if you dare.
 *	- IRQ, also choose one your card supports or nothing and let
 *	  the driver figure it out.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/interrupt.h>
#include <linux/ptrace.h>
#include <linux/ioport.h>
#include <linux/in.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/if_arp.h>
#include <linux/if_ltalk.h>
#include <linux/delay.h>	/* For udelay() */
#include <linux/atalk.h>
#include <linux/spinlock.h>
#include <linux/bitops.h>

#include <asm/system.h>
#include <asm/io.h>
#include <asm/dma.h>

#include "cops.h"		/* Our Stuff */
#include "cops_ltdrv.h"		/* Firmware code for Tangent type cards. */
#include "cops_ffdrv.h"		/* Firmware code for Dayna type cards. */

/*
 *      The name of the card. Is used for messages and in the requests for
 *      io regions, irqs and dma channels
 */

static const char *cardname = "cops";

#ifdef CONFIG_COPS_DAYNA
static int board_type = DAYNA;	/* Module exported */
#else
static int board_type = TANGENT;
#endif

static int io = 0x240;		/* Default IO for Dayna */
static int irq = 5;		/* Default IRQ */

/*
 *	COPS Autoprobe information.
 *	Right now if port address is right but IRQ is not 5 this will
 *      return a 5 no matter what since we will still get a status response.
 *      Need one more additional check to narrow down after we have gotten
 *      the ioaddr. But since only other possible IRQs is 3 and 4 so no real
 *	hurry on this. I *STRONGLY* recommend using IRQ 5 for your card with
 *	this driver.
 * 
 *	This driver has 2 modes and they are: Dayna mode and Tangent mode.
 *	Each mode corresponds with the type of card. It has been found
 *	that there are 2 main types of cards and all other cards are
 *	the same and just have different names or only have minor differences
 *	such as more IO ports. As this driver is tested it will
 *	become more clear on exactly what cards are supported. The driver
 *	defaults to using Dayna mode. To change the drivers mode, simply
 *	select Dayna or Tangent mode when configuring the kernel.
 *
 *      This driver should support:
 *      TANGENT driver mode:
 *              Tangent ATB-II, Novell NL-1000, Daystar Digital LT-200,
 *		COPS LT-1
 *      DAYNA driver mode:
 *              Dayna DL2000/DaynaTalk PC (Half Length), COPS LT-95, 
 *		Farallon PhoneNET PC III, Farallon PhoneNET PC II
 *	Other cards possibly supported mode unkown though:
 *		Dayna DL2000 (Full length), COPS LT/M (Micro-Channel)
 *
 *	Cards NOT supported by this driver but supported by the ltpc.c
 *	driver written by Bradford W. Johnson <johns393@maroon.tc.umn.edu>
 *		Farallon PhoneNET PC
 *		Original Apple LocalTalk PC card
 * 
 *      N.B.
 *
 *      The Daystar Digital LT200 boards do not support interrupt-driven
 *      IO.  You must specify 'irq=0xff' as a module parameter to invoke
 *      polled mode.  I also believe that the port probing logic is quite
 *      dangerous at best and certainly hopeless for a polled card.  Best to 
 *      specify both. - Steve H.
 *
 */

/*
 * Zero terminated list of IO ports to probe.
 */

static unsigned int ports[] = { 
	0x240, 0x340, 0x200, 0x210, 0x220, 0x230, 0x260, 
	0x2A0, 0x300, 0x310, 0x320, 0x330, 0x350, 0x360,
	0
};

/*
 * Zero terminated list of IRQ ports to probe.
 */

static int cops_irqlist[] = {
	5, 4, 3, 0 
};

static struct timer_list cops_timer;

/* use 0 for production, 1 for verification, 2 for debug, 3 for verbose debug */
#ifndef COPS_DEBUG
#define COPS_DEBUG 1 
#endif
static unsigned int cops_debug = COPS_DEBUG;

/* The number of low I/O ports used by the card. */
#define COPS_IO_EXTENT       8

/* Information that needs to be kept for each board. */

struct cops_local
{
        struct net_device_stats stats;
        int board;			/* Holds what board type is. */
	int nodeid;			/* Set to 1 once have nodeid. */
        unsigned char node_acquire;	/* Node ID when acquired. */
        struct atalk_addr node_addr;	/* Full node address */
	spinlock_t lock;		/* RX/TX lock */
};

/* Index to functions, as function prototypes. */
static int  cops_probe1 (struct net_device *dev, int ioaddr);
static int  cops_irq (int ioaddr, int board);

static int  cops_open (struct net_device *dev);
static int  cops_jumpstart (struct net_device *dev);
static void cops_reset (struct net_device *dev, int sleep);
static void cops_load (struct net_device *dev);
static int  cops_nodeid (struct net_device *dev, int nodeid);

static irqreturn_t cops_interrupt (int irq, void *dev_id);
static void cops_poll (unsigned long ltdev);
static void cops_timeout(struct net_device *dev);
static void cops_rx (struct net_device *dev);
static int  cops_send_packet (struct sk_buff *skb, struct net_device *dev);
static void set_multicast_list (struct net_device *dev);
static int  cops_hard_header (struct sk_buff *skb, struct net_device *dev,
			      unsigned short type, void *daddr, void *saddr, 
			      unsigned len);

static int  cops_ioctl (struct net_device *dev, struct ifreq *rq, int cmd);
static int  cops_close (struct net_device *dev);
static struct net_device_stats *cops_get_stats (struct net_device *dev);

static void cleanup_card(struct net_device *dev)
{
	if (dev->irq)
		free_irq(dev->irq, dev);
	release_region(dev->base_addr, COPS_IO_EXTENT);
}

/*
 *      Check for a network adaptor of this type, and return '0' iff one exists.
 *      If dev->base_addr == 0, probe all likely locations.
 *      If dev->base_addr in [1..0x1ff], always return failure.
 *        otherwise go with what we pass in.
 */
struct net_device * __init cops_probe(int unit)
{
	struct net_device *dev;
	unsigned *port;
	int base_addr;
	int err = 0;

	dev = alloc_ltalkdev(sizeof(struct cops_local));
	if (!dev)
		return ERR_PTR(-ENOMEM);

	if (unit >= 0) {
		sprintf(dev->name, "lt%d", unit);
		netdev_boot_setup_check(dev);
		irq = dev->irq;
		base_addr = dev->base_addr;
	} else {
		base_addr = dev->base_addr = io;
	}

	SET_MODULE_OWNER(dev);

	if (base_addr > 0x1ff) {    /* Check a single specified location. */
		err = cops_probe1(dev, base_addr);
	} else if (base_addr != 0) { /* Don't probe at all. */
		err = -ENXIO;
	} else {
		/* FIXME  Does this really work for cards which generate irq?
		 * It's definitely N.G. for polled Tangent. sh
		 * Dayna cards don't autoprobe well at all, but if your card is
		 * at IRQ 5 & IO 0x240 we find it every time. ;) JS
		 */
		for (port = ports; *port && cops_probe1(dev, *port) < 0; port++)
			;
		if (!*port)
			err = -ENODEV;
	}
	if (err)
		goto out;
	err = register_netdev(dev);
	if (err)
		goto out1;
	return dev;
out1:
	cleanup_card(dev);
out:
	free_netdev(dev);
	return ERR_PTR(err);
}

/*
 *      This is the real probe routine. Linux has a history of friendly device


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