[PATCH] PM: Fix SMP races in the freezer

Currently, to tell a task that it should go to the refrigerator, we set the
PF_FREEZE flag for it and send a fake signal to it.  Unfortunately there
are two SMP-related problems with this approach.  First, a task running on
another CPU may be updating its flags while the freezer attempts to set
PF_FREEZE for it and this may leave the task's flags in an inconsistent
state.  Second, there is a potential race between freeze_process() and
refrigerator() in which freeze_process() running on one CPU is reading a
task's PF_FREEZE flag while refrigerator() running on another CPU has just
set PF_FROZEN for the same task and attempts to reset PF_FREEZE for it.  If
the refrigerator wins the race, freeze_process() will state that PF_FREEZE
hasn't been set for the task and will set it unnecessarily, so the task
will go to the refrigerator once again after it's been thawed.

To solve first of these problems we need to stop using PF_FREEZE to tell
tasks that they should go to the refrigerator.  Instead, we can introduce a
special TIF_*** flag and use it for this purpose, since it is allowed to
change the other tasks' TIF_*** flags and there are special calls for it.

To avoid the freeze_process()-refrigerator() race we can make
freeze_process() to always check the task's PF_FROZEN flag after it's read
its "freeze" flag.  We should also make sure that refrigerator() will
always reset the task's "freeze" flag after it's set PF_FROZEN for it.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: David Howells <dhowells@redhat.com>
Cc: Andi Kleen <ak@muc.de>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/include/asm-arm/thread_info.h b/include/asm-arm/thread_info.h
index d9b8bdd..5014794 100644 (file)
--- a/include/asm-arm/thread_info.h
+++ b/include/asm-arm/thread_info.h
@@ -147,6 +147,7 @@ extern void iwmmxt_task_switch(struct thread_info *);
 #define TIF_POLLING_NRFLAG     16
 #define TIF_USING_IWMMXT       17
 #define TIF_MEMDIE             18
+#define TIF_FREEZE             19
 
 #define _TIF_NOTIFY_RESUME     (1 << TIF_NOTIFY_RESUME)
 #define _TIF_SIGPENDING                (1 << TIF_SIGPENDING)
@@ -154,6 +155,7 @@ extern void iwmmxt_task_switch(struct thread_info *);
 #define _TIF_SYSCALL_TRACE     (1 << TIF_SYSCALL_TRACE)
 #define _TIF_POLLING_NRFLAG    (1 << TIF_POLLING_NRFLAG)
 #define _TIF_USING_IWMMXT      (1 << TIF_USING_IWMMXT)
+#define _TIF_FREEZE            (1 << TIF_FREEZE)
 
 /*
  * Change these and you break ASM code in entry-common.S

diff --git a/include/asm-frv/thread_info.h b/include/asm-frv/thread_info.h
index d66c48e..d881f51 100644 (file)
--- a/include/asm-frv/thread_info.h
+++ b/include/asm-frv/thread_info.h
@@ -116,6 +116,7 @@ register struct thread_info *__current_thread_info asm("gr15");
 #define TIF_RESTORE_SIGMASK    6       /* restore signal mask in do_signal() */
 #define TIF_POLLING_NRFLAG     16      /* true if poll_idle() is polling TIF_NEED_RESCHED */
 #define TIF_MEMDIE             17      /* OOM killer killed process */
+#define TIF_FREEZE             18      /* freezing for suspend */
 
 #define _TIF_SYSCALL_TRACE     (1 << TIF_SYSCALL_TRACE)
 #define _TIF_NOTIFY_RESUME     (1 << TIF_NOTIFY_RESUME)
@@ -125,6 +126,7 @@ register struct thread_info *__current_thread_info asm("gr15");
 #define _TIF_IRET              (1 << TIF_IRET)
 #define _TIF_RESTORE_SIGMASK   (1 << TIF_RESTORE_SIGMASK)
 #define _TIF_POLLING_NRFLAG    (1 << TIF_POLLING_NRFLAG)
+#define _TIF_FREEZE            (1 << TIF_FREEZE)
 
 #define _TIF_WORK_MASK         0x0000FFFE      /* work to do on interrupt/exception return */
 #define _TIF_ALLWORK_MASK      0x0000FFFF      /* work to do on any return to u-space */

diff --git a/include/asm-i386/thread_info.h b/include/asm-i386/thread_info.h
index 46d32ad..4b187bb 100644 (file)
--- a/include/asm-i386/thread_info.h
+++ b/include/asm-i386/thread_info.h
@@ -134,6 +134,7 @@ static inline struct thread_info *current_thread_info(void)
 #define TIF_MEMDIE             16
 #define TIF_DEBUG              17      /* uses debug registers */
 #define TIF_IO_BITMAP          18      /* uses I/O bitmap */
+#define TIF_FREEZE             19      /* is freezing for suspend */
 
 #define _TIF_SYSCALL_TRACE     (1<<TIF_SYSCALL_TRACE)
 #define _TIF_NOTIFY_RESUME     (1<<TIF_NOTIFY_RESUME)
@@ -147,6 +148,7 @@ static inline struct thread_info *current_thread_info(void)
 #define _TIF_RESTORE_SIGMASK   (1<<TIF_RESTORE_SIGMASK)
 #define _TIF_DEBUG             (1<<TIF_DEBUG)
 #define _TIF_IO_BITMAP         (1<<TIF_IO_BITMAP)
+#define _TIF_FREEZE            (1<<TIF_FREEZE)
 
 /* work to do on interrupt/exception return */
 #define _TIF_WORK_MASK \

diff --git a/include/asm-ia64/thread_info.h b/include/asm-ia64/thread_info.h
index 8adcde0..9b505b2 100644 (file)
--- a/include/asm-ia64/thread_info.h
+++ b/include/asm-ia64/thread_info.h
@@ -88,6 +88,7 @@ struct thread_info {
 #define TIF_MEMDIE             17
 #define TIF_MCA_INIT           18      /* this task is processing MCA or INIT */
 #define TIF_DB_DISABLED                19      /* debug trap disabled for fsyscall */
+#define TIF_FREEZE             20      /* is freezing for suspend */
 
 #define _TIF_SYSCALL_TRACE     (1 << TIF_SYSCALL_TRACE)
 #define _TIF_SYSCALL_AUDIT     (1 << TIF_SYSCALL_AUDIT)
@@ -98,6 +99,7 @@ struct thread_info {
 #define _TIF_POLLING_NRFLAG    (1 << TIF_POLLING_NRFLAG)
 #define _TIF_MCA_INIT          (1 << TIF_MCA_INIT)
 #define _TIF_DB_DISABLED       (1 << TIF_DB_DISABLED)
+#define _TIF_FREEZE            (1 << TIF_FREEZE)
 
 /* "work to do on user-return" bits */
 #define TIF_ALLWORK_MASK       (_TIF_NOTIFY_RESUME|_TIF_SIGPENDING|_TIF_NEED_RESCHED|_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT)

diff --git a/include/asm-powerpc/thread_info.h b/include/asm-powerpc/thread_info.h
index d339e2e..3f32ca8 100644 (file)
--- a/include/asm-powerpc/thread_info.h
+++ b/include/asm-powerpc/thread_info.h
@@ -122,6 +122,7 @@ static inline struct thread_info *current_thread_info(void)
 #define TIF_RESTOREALL         12      /* Restore all regs (implies NOERROR) */
 #define TIF_NOERROR            14      /* Force successful syscall return */
 #define TIF_RESTORE_SIGMASK    15      /* Restore signal mask in do_signal */
+#define TIF_FREEZE             16      /* Freezing for suspend */
 
 /* as above, but as bit values */
 #define _TIF_SYSCALL_TRACE     (1<<TIF_SYSCALL_TRACE)
@@ -138,6 +139,7 @@ static inline struct thread_info *current_thread_info(void)
 #define _TIF_RESTOREALL                (1<<TIF_RESTOREALL)
 #define _TIF_NOERROR           (1<<TIF_NOERROR)
 #define _TIF_RESTORE_SIGMASK   (1<<TIF_RESTORE_SIGMASK)
+#define _TIF_FREEZE            (1<<TIF_FREEZE)
 #define _TIF_SYSCALL_T_OR_A    (_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP)
 
 #define _TIF_USER_WORK_MASK    (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING | \

diff --git a/include/asm-sh/thread_info.h b/include/asm-sh/thread_info.h
index 0c01dc5..879f741 100644 (file)
--- a/include/asm-sh/thread_info.h
+++ b/include/asm-sh/thread_info.h
@@ -106,6 +106,7 @@ static inline struct thread_info *current_thread_info(void)
 #define TIF_USEDFPU            16      /* FPU was used by this task this quantum (SMP) */
 #define TIF_POLLING_NRFLAG     17      /* true if poll_idle() is polling TIF_NEED_RESCHED */
 #define TIF_MEMDIE             18
+#define TIF_FREEZE             19
 
 #define _TIF_SYSCALL_TRACE     (1<<TIF_SYSCALL_TRACE)
 #define _TIF_NOTIFY_RESUME     (1<<TIF_NOTIFY_RESUME)
@@ -114,6 +115,7 @@ static inline struct thread_info *current_thread_info(void)
 #define _TIF_RESTORE_SIGMASK   (1<<TIF_RESTORE_SIGMASK)
 #define _TIF_USEDFPU           (1<<TIF_USEDFPU)
 #define _TIF_POLLING_NRFLAG    (1<<TIF_POLLING_NRFLAG)
+#define _TIF_FREEZE            (1<<TIF_FREEZE)
 
 #define _TIF_WORK_MASK         0x000000FE      /* work to do on interrupt/exception return */
 #define _TIF_ALLWORK_MASK      0x000000FF      /* work to do on any return to u-space */

diff --git a/include/asm-x86_64/thread_info.h b/include/asm-x86_64/thread_info.h
index 787a081..74a6c74 100644 (file)
--- a/include/asm-x86_64/thread_info.h
+++ b/include/asm-x86_64/thread_info.h
@@ -122,6 +122,7 @@ static inline struct thread_info *stack_thread_info(void)
 #define TIF_MEMDIE             20
 #define TIF_DEBUG              21      /* uses debug registers */
 #define TIF_IO_BITMAP          22      /* uses I/O bitmap */
+#define TIF_FREEZE             23      /* is freezing for suspend */
 
 #define _TIF_SYSCALL_TRACE     (1<<TIF_SYSCALL_TRACE)
 #define _TIF_NOTIFY_RESUME     (1<<TIF_NOTIFY_RESUME)
@@ -137,6 +138,7 @@ static inline struct thread_info *stack_thread_info(void)
 #define _TIF_ABI_PENDING       (1<<TIF_ABI_PENDING)
 #define _TIF_DEBUG             (1<<TIF_DEBUG)
 #define _TIF_IO_BITMAP         (1<<TIF_IO_BITMAP)
+#define _TIF_FREEZE            (1<<TIF_FREEZE)
 
 /* work to do on interrupt/exception return */
 #define _TIF_WORK_MASK \

diff --git a/include/linux/freezer.h b/include/linux/freezer.h
index 3930630..5e75e26 100644 (file)
--- a/include/linux/freezer.h
+++ b/include/linux/freezer.h
@@ -16,16 +16,15 @@ static inline int frozen(struct task_struct *p)
  */
 static inline int freezing(struct task_struct *p)
 {
-       return p->flags & PF_FREEZE;
+       return test_tsk_thread_flag(p, TIF_FREEZE);
 }
 
 /*
  * Request that a process be frozen
- * FIXME: SMP problem. We may not modify other process' flags!
  */
 static inline void freeze(struct task_struct *p)
 {
-       p->flags |= PF_FREEZE;
+       set_tsk_thread_flag(p, TIF_FREEZE);
 }
 
 /*
@@ -33,7 +32,7 @@ static inline void freeze(struct task_struct *p)
  */
 static inline void do_not_freeze(struct task_struct *p)
 {
-       p->flags &= ~PF_FREEZE;
+       clear_tsk_thread_flag(p, TIF_FREEZE);
 }
 
 /*
@@ -54,7 +53,9 @@ static inline int thaw_process(struct task_struct *p)
  */
 static inline void frozen_process(struct task_struct *p)
 {
-       p->flags = (p->flags & ~PF_FREEZE) | PF_FROZEN;
+       p->flags |= PF_FROZEN;
+       wmb();
+       clear_tsk_thread_flag(p, TIF_FREEZE);
 }
 
 extern void refrigerator(void);

diff --git a/include/linux/sched.h b/include/linux/sched.h
index ea92e5c..4463735 100644 (file)
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1144,7 +1144,6 @@ static inline void put_task_struct(struct task_struct *t)
 #define PF_MEMALLOC    0x00000800      /* Allocating memory */
 #define PF_FLUSHER     0x00001000      /* responsible for disk writeback */
 #define PF_USED_MATH   0x00002000      /* if unset the fpu must be initialized before use */
-#define PF_FREEZE      0x00004000      /* this task is being frozen for suspend now */
 #define PF_NOFREEZE    0x00008000      /* this thread should not be frozen */
 #define PF_FROZEN      0x00010000      /* frozen for system suspend */
 #define PF_FSTRANS     0x00020000      /* inside a filesystem transaction */

diff --git a/kernel/power/process.c b/kernel/power/process.c
index b9a3286..6d566bf 100644 (file)
--- a/kernel/power/process.c
+++ b/kernel/power/process.c
@@ -60,13 +60,16 @@ static inline void freeze_process(struct task_struct *p)
        unsigned long flags;
 
        if (!freezing(p)) {
-               if (p->state == TASK_STOPPED)
-                       force_sig_specific(SIGSTOP, p);
-
-               freeze(p);
-               spin_lock_irqsave(&p->sighand->siglock, flags);
-               signal_wake_up(p, p->state == TASK_STOPPED);
-               spin_unlock_irqrestore(&p->sighand->siglock, flags);
+               rmb();
+               if (!frozen(p)) {
+                       if (p->state == TASK_STOPPED)
+                               force_sig_specific(SIGSTOP, p);
+
+                       freeze(p);
+                       spin_lock_irqsave(&p->sighand->siglock, flags);
+                       signal_wake_up(p, p->state == TASK_STOPPED);
+                       spin_unlock_irqrestore(&p->sighand->siglock, flags);
+               }
        }
 }