forked from Minki/linux
ec7147a99e
Under some conditions, CIFS can repeatedly call the cifs_dbg() logging wrapper. If done rapidly enough, the console framebuffer can softlockup or "rcu_sched self-detected stall". Apply the built-in log ratelimiters to prevent such hangs. Signed-off-by: Jamie Bainbridge <jamie.bainbridge@gmail.com> Signed-off-by: Steve French <smfrench@gmail.com> CC: Stable <stable@vger.kernel.org>
77 lines
2.0 KiB
C
77 lines
2.0 KiB
C
/*
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*
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* Copyright (c) International Business Machines Corp., 2000,2002
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* Modified by Steve French (sfrench@us.ibm.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#ifndef _H_CIFS_DEBUG
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#define _H_CIFS_DEBUG
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void cifs_dump_mem(char *label, void *data, int length);
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void cifs_dump_detail(void *);
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void cifs_dump_mids(struct TCP_Server_Info *);
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extern int traceSMB; /* flag which enables the function below */
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void dump_smb(void *, int);
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#define CIFS_INFO 0x01
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#define CIFS_RC 0x02
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#define CIFS_TIMER 0x04
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#define VFS 1
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#define FYI 2
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extern int cifsFYI;
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#ifdef CONFIG_CIFS_DEBUG2
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#define NOISY 4
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#else
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#define NOISY 0
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#endif
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/*
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* debug ON
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* --------
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*/
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#ifdef CONFIG_CIFS_DEBUG
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__printf(1, 2) void cifs_vfs_err(const char *fmt, ...);
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/* information message: e.g., configuration, major event */
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#define cifs_dbg(type, fmt, ...) \
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do { \
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if (type == FYI && cifsFYI & CIFS_INFO) { \
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pr_debug_ratelimited("%s: " \
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fmt, __FILE__, ##__VA_ARGS__); \
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} else if (type == VFS) { \
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cifs_vfs_err(fmt, ##__VA_ARGS__); \
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} else if (type == NOISY && type != 0) { \
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pr_debug_ratelimited(fmt, ##__VA_ARGS__); \
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} \
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} while (0)
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/*
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* debug OFF
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* ---------
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*/
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#else /* _CIFS_DEBUG */
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#define cifs_dbg(type, fmt, ...) \
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do { \
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if (0) \
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pr_debug(fmt, ##__VA_ARGS__); \
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} while (0)
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#endif
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#endif /* _H_CIFS_DEBUG */
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