diff options
| author | David S. Miller <davem@davemloft.net> | 2008-05-01 03:30:22 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-05-02 05:22:52 -0700 |
| commit | 2678fefedbbc03a3ae6f5c254791bf147d6c52fd (patch) | |
| tree | 23052dffe4591f06192b8ee9cd17a1160fe4520f /arch/sparc64/kernel/signal.c | |
| parent | 32039f4954938e4d761032d7046254d08d0db54c (diff) | |
sparc64: Fix syscall restart, for real...
The change I put into copy_thread() just papered over the real
problem.
When we are looking to see if we should do a syscall restart, when
deliverying a signal, we should only interpret the syscall return
value as an error if the carry condition code(s) are set.
Otherwise it's a success return.
Also, sigreturn paths should do a pt_regs_clear_trap_type().
It turns out that doing a syscall restart when returning from a fork()
does and should happen, from time to time. Even if copy_thread()
returns success, copy_process() can still unwind and signal
-ERESTARTNOINTR in the parent.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc64/kernel/signal.c')
| -rw-r--r-- | arch/sparc64/kernel/signal.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/sparc64/kernel/signal.c b/arch/sparc64/kernel/signal.c index f2d88d8f7a42..45d6bf632daa 100644 --- a/arch/sparc64/kernel/signal.c +++ b/arch/sparc64/kernel/signal.c @@ -332,6 +332,9 @@ void do_rt_sigreturn(struct pt_regs *regs) regs->tpc = tpc; regs->tnpc = tnpc; + /* Prevent syscall restart. */ + pt_regs_clear_trap_type(regs); + sigdelsetmask(&set, ~_BLOCKABLE); spin_lock_irq(¤t->sighand->siglock); current->blocked = set; @@ -515,7 +518,8 @@ static void do_signal(struct pt_regs *regs, unsigned long orig_i0) siginfo_t info; int signr; - if (pt_regs_is_syscall(regs)) { + if (pt_regs_is_syscall(regs) && + (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) { pt_regs_clear_trap_type(regs); cookie.restart_syscall = 1; } else |