ftrace: Synchronize the initialization of ftrace_opsgrafted

There's some internal state that ftrace_ops needs to have set, but since
it can be declared outside of the ftrace.c code, it calls
ftrace_ops_init() on the ops in every global function. The issue is that
if two tasks call it on the same ops at the same time it is possible to
have the initialization of one corrupt the initialization of the other
call.

Create a ops_mutex to use to synchronize every initialization of the
ftrace_ops. The mutex is taken within checking the ftrace_ops flag that
states it was initializied but the flag is checked again after the mutex
has been taken. Checking first outside the mutex allows it to shortcut
having to take the mutex. But then the check needs to be done again after
the mute is taken in case of races.

Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20260902095501.6b59af20@gandalf.local.home
Fixes: f04f24fb7e48d ("ftrace, kprobes: Fix a deadlock on ftrace_regex_lock")
Reported-by: sashiko-bot@kernel.org
Close: https://lore.kernel.org/all/20260829025528.49A831F000E9@smtp.kernel.org/
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 293 insertions, 0 deletions

diff --git a/drivers/message/fusion/mptdebug.h b/drivers/message/fusion/mptdebug.h
new file mode 100644
index 000000000..c281b1359
--- /dev/null
+++ b/drivers/message/fusion/mptdebug.h
@@ -0,0 +1,293 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ *  linux/drivers/message/fusion/mptdebug.h
+ *      For use with LSI PCI chip/adapter(s)
+ *      running LSI Fusion MPT (Message Passing Technology) firmware.
+ *
+ *  Copyright (c) 1999-2008 LSI Corporation
+ *  (mailto:DL-MPTFusionLinux@lsi.com)
+ *
+ */
+/*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/
+
+#ifndef MPTDEBUG_H_INCLUDED
+#define MPTDEBUG_H_INCLUDED
+
+/*
+ * debug level can be programmed on the fly via SysFS (hex values)
+ *
+ * Example:  (programming for MPT_DEBUG_EVENTS on host 5)
+ *
+ * echo 8 > /sys/class/scsi_host/host5/debug_level
+ *
+ * --------------------------------------------------------
+ * mpt_debug_level - command line parameter
+ * this allow enabling debug at driver load time (for all iocs)
+ *
+ * Example  (programming for MPT_DEBUG_EVENTS)
+ *
+ * insmod mptbase.ko mpt_debug_level=8
+ *
+ * --------------------------------------------------------
+ * CONFIG_FUSION_LOGGING - enables compiling debug into driver
+ * this can be enabled in the driver Makefile
+ *
+ *
+ * --------------------------------------------------------
+ * Please note most debug prints are set to logging priority = debug
+ * This is the lowest level, and most verbose.  Please refer to manual
+ * pages for syslogd or syslogd-ng on how to configure this.
+ */
+
+#define MPT_DEBUG			0x00000001
+#define MPT_DEBUG_MSG_FRAME		0x00000002
+#define MPT_DEBUG_SG			0x00000004
+#define MPT_DEBUG_EVENTS		0x00000008
+#define MPT_DEBUG_VERBOSE_EVENTS	0x00000010
+#define MPT_DEBUG_INIT			0x00000020
+#define MPT_DEBUG_EXIT			0x00000040
+#define MPT_DEBUG_FAIL			0x00000080
+#define MPT_DEBUG_TM			0x00000100
+#define MPT_DEBUG_DV			0x00000200
+#define MPT_DEBUG_REPLY			0x00000400
+#define MPT_DEBUG_HANDSHAKE		0x00000800
+#define MPT_DEBUG_CONFIG		0x00001000
+#define MPT_DEBUG_DL			0x00002000
+#define MPT_DEBUG_RESET			0x00008000
+#define MPT_DEBUG_SCSI			0x00010000
+#define MPT_DEBUG_IOCTL			0x00020000
+#define MPT_DEBUG_FC			0x00080000
+#define MPT_DEBUG_SAS			0x00100000
+#define MPT_DEBUG_SAS_WIDE		0x00200000
+#define MPT_DEBUG_36GB_MEM              0x00400000
+
+/*
+ * CONFIG_FUSION_LOGGING - enabled in Kconfig
+ */
+
+#ifdef CONFIG_FUSION_LOGGING
+#define MPT_CHECK_LOGGING(IOC, CMD, BITS)			\
+do {								\
+	if (IOC->debug_level & BITS)				\
+		CMD;						\
+} while (0)
+#else
+#define MPT_CHECK_LOGGING(IOC, CMD, BITS)			\
+do { } while (0)
+#endif
+
+
+/*
+ * debug macros
+ */
+
+#define dprintk(IOC, CMD)			\
+	MPT_CHECK_LOGGING(IOC, CMD, MPT_DEBUG)
+
+#define dsgprintk(IOC, CMD)			\
+	MPT_CHECK_LOGGING(IOC, CMD, MPT_DEBUG_SG)
+
+#define devtprintk(IOC, CMD)			\
+	MPT_CHECK_LOGGING(IOC, CMD, MPT_DEBUG_EVENTS)
+
+#define devtverboseprintk(IOC, CMD)		\
+	MPT_CHECK_LOGGING(IOC, CMD, MPT_DEBUG_VERBOSE_EVENTS)
+
+#define dinitprintk(IOC, CMD)			\
+	MPT_CHECK_LOGGING(IOC, CMD, MPT_DEBUG_INIT)
+
+#define dexitprintk(IOC, CMD)			\
+	MPT_CHECK_LOGGING(IOC, CMD, MPT_DEBUG_EXIT)
+
+#define dfailprintk(IOC, CMD)			\
+	MPT_CHECK_LOGGING(IOC, CMD, MPT_DEBUG_FAIL)
+
+#define dtmprintk(IOC, CMD)			\
+	MPT_CHECK_LOGGING(IOC, CMD, MPT_DEBUG_TM)
+
+#define ddvprintk(IOC, CMD)			\
+	MPT_CHECK_LOGGING(IOC, CMD, MPT_DEBUG_DV)
+
+#define dreplyprintk(IOC, CMD)			\
+	MPT_CHECK_LOGGING(IOC, CMD, MPT_DEBUG_REPLY)
+
+#define dhsprintk(IOC, CMD)			\
+	MPT_CHECK_LOGGING(IOC, CMD, MPT_DEBUG_HANDSHAKE)
+
+#define dcprintk(IOC, CMD)			\
+	MPT_CHECK_LOGGING(IOC, CMD, MPT_DEBUG_CONFIG)
+
+#define ddlprintk(IOC, CMD)			\
+	MPT_CHECK_LOGGING(IOC, CMD, MPT_DEBUG_DL)
+
+#define drsprintk(IOC, CMD)			\
+	MPT_CHECK_LOGGING(IOC, CMD, MPT_DEBUG_RESET)
+
+#define dsprintk(IOC, CMD)			\
+	MPT_CHECK_LOGGING(IOC, CMD, MPT_DEBUG_SCSI)
+
+#define dctlprintk(IOC, CMD)			\
+	MPT_CHECK_LOGGING(IOC, CMD, MPT_DEBUG_IOCTL)
+
+#define dfcprintk(IOC, CMD)			\
+	MPT_CHECK_LOGGING(IOC, CMD, MPT_DEBUG_FC)
+
+#define dsasprintk(IOC, CMD)			\
+	MPT_CHECK_LOGGING(IOC, CMD, MPT_DEBUG_SAS)
+
+#define dsaswideprintk(IOC, CMD)		\
+	MPT_CHECK_LOGGING(IOC, CMD, MPT_DEBUG_SAS_WIDE)
+
+#define d36memprintk(IOC, CMD)		\
+	MPT_CHECK_LOGGING(IOC, CMD, MPT_DEBUG_36GB_MEM)
+
+
+/*
+ * Verbose logging
+ */
+#if defined(MPT_DEBUG_VERBOSE) && defined(CONFIG_FUSION_LOGGING)
+static inline void
+DBG_DUMP_FW_DOWNLOAD(MPT_ADAPTER *ioc, u32  *mfp, int numfrags)
+{
+	int i;
+
+	if (!(ioc->debug_level & MPT_DEBUG))
+		return;
+	printk(KERN_DEBUG "F/W download request:\n");
+	for (i=0; i < 7+numfrags*2; i++)
+		printk(" %08x", le32_to_cpu(mfp[i]));
+	printk("\n");
+}
+
+static inline void
+DBG_DUMP_PUT_MSG_FRAME(MPT_ADAPTER *ioc, u32 *mfp)
+{
+	int	 ii, n;
+
+	if (!(ioc->debug_level & MPT_DEBUG_MSG_FRAME))
+		return;
+	printk(KERN_DEBUG "%s: About to Put msg frame @ %p:\n",
+		ioc->name, mfp);
+	n = ioc->req_sz/4 - 1;
+	while (mfp[n] == 0)
+		n--;
+	for (ii=0; ii<=n; ii++) {
+		if (ii && ((ii%8)==0))
+			printk("\n");
+		printk(" %08x", le32_to_cpu(mfp[ii]));
+	}
+	printk("\n");
+}
+
+static inline void
+DBG_DUMP_FW_REQUEST_FRAME(MPT_ADAPTER *ioc, u32 *mfp)
+{
+	int  i, n;
+
+	if (!(ioc->debug_level & MPT_DEBUG_MSG_FRAME))
+		return;
+	n = 10;
+	printk(KERN_INFO " ");
+	for (i = 0; i < n; i++)
+		printk(" %08x", le32_to_cpu(mfp[i]));
+	printk("\n");
+}
+
+static inline void
+DBG_DUMP_REQUEST_FRAME(MPT_ADAPTER *ioc, u32 *mfp)
+{
+	int  i, n;
+
+	if (!(ioc->debug_level & MPT_DEBUG_MSG_FRAME))
+		return;
+	n = 24;
+	for (i=0; i<n; i++) {
+		if (i && ((i%8)==0))
+			printk("\n");
+		printk("%08x ", le32_to_cpu(mfp[i]));
+	}
+	printk("\n");
+}
+
+static inline void
+DBG_DUMP_REPLY_FRAME(MPT_ADAPTER *ioc, u32 *mfp)
+{
+	int  i, n;
+
+	if (!(ioc->debug_level & MPT_DEBUG_MSG_FRAME))
+		return;
+	n = (le32_to_cpu(mfp[0]) & 0x00FF0000) >> 16;
+	printk(KERN_INFO " ");
+	for (i=0; i<n; i++)
+		printk(" %08x", le32_to_cpu(mfp[i]));
+	printk("\n");
+}
+
+static inline void
+DBG_DUMP_REQUEST_FRAME_HDR(MPT_ADAPTER *ioc, u32 *mfp)
+{
+	int  i, n;
+
+	if (!(ioc->debug_level & MPT_DEBUG_MSG_FRAME))
+		return;
+	n = 3;
+	printk(KERN_INFO " ");
+	for (i=0; i<n; i++)
+		printk(" %08x", le32_to_cpu(mfp[i]));
+	printk("\n");
+}
+
+static inline void
+DBG_DUMP_TM_REQUEST_FRAME(MPT_ADAPTER *ioc, u32 *mfp)
+{
+	int  i, n;
+
+	if (!(ioc->debug_level & MPT_DEBUG_TM))
+		return;
+	n = 13;
+	printk(KERN_DEBUG "TM_REQUEST:\n");
+	for (i=0; i<n; i++) {
+		if (i && ((i%8)==0))
+			printk("\n");
+		printk("%08x ", le32_to_cpu(mfp[i]));
+	}
+	printk("\n");
+}
+
+static inline void
+DBG_DUMP_TM_REPLY_FRAME(MPT_ADAPTER *ioc, u32 *mfp)
+{
+	int  i, n;
+
+	if (!(ioc->debug_level & MPT_DEBUG_TM))
+		return;
+	n = (le32_to_cpu(mfp[0]) & 0x00FF0000) >> 16;
+	printk(KERN_DEBUG "TM_REPLY MessageLength=%d:\n", n);
+	for (i=0; i<n; i++) {
+		if (i && ((i%8)==0))
+			printk("\n");
+		printk(" %08x", le32_to_cpu(mfp[i]));
+	}
+	printk("\n");
+}
+
+#define dmfprintk(IOC, CMD)			\
+	MPT_CHECK_LOGGING(IOC, CMD, MPT_DEBUG_MSG_FRAME)
+
+# else /* ifdef MPT_DEBUG_MF */
+
+#define DBG_DUMP_FW_DOWNLOAD(IOC, mfp, numfrags)
+#define DBG_DUMP_PUT_MSG_FRAME(IOC, mfp)
+#define DBG_DUMP_FW_REQUEST_FRAME(IOC, mfp)
+#define DBG_DUMP_REQUEST_FRAME(IOC, mfp)
+#define DBG_DUMP_REPLY_FRAME(IOC, mfp)
+#define DBG_DUMP_REQUEST_FRAME_HDR(IOC, mfp)
+#define DBG_DUMP_TM_REQUEST_FRAME(IOC, mfp)
+#define DBG_DUMP_TM_REPLY_FRAME(IOC, mfp)
+
+#define dmfprintk(IOC, CMD)			\
+	MPT_CHECK_LOGGING(IOC, CMD, MPT_DEBUG_MSG_FRAME)
+
+#endif /* defined(MPT_DEBUG_VERBOSE) && defined(CONFIG_FUSION_LOGGING) */
+
+#endif /* ifndef MPTDEBUG_H_INCLUDED */