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[MIPS] Avoid double signal restarting.

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In entry.S resume_userspace ... jal do_notify_resume form a loop through
which the kernel will iterate as long as work is pending.  If we
iterate through this loop more than once with no signal pending for at
least one but the last iteration we will take do the syscall restarting
multiple times resulting in a syscall return prior to the the syscall
instruction in userspace.  This may happen when debugging a multithreaded
program.

Debugging and original fix by Maciej; extended to other ABIs by me.

Signed-off-by: Maciej W. Rozycki <macro@mips.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Ralf Baechle 2006-08-08 03:47:01 +01:00
parent 847b9dfcca
commit 13fdd31abe
3 changed files with 3 additions and 1 deletions
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1
arch/mips/kernel/irixsig.c
View file

@ -224,6 +224,7 @@ void do_irix_signal(struct pt_regs *regs)
regs->regs[7] = regs->regs[26];
regs->cp0_epc -= 4;
}
regs->regs[0] = 0; /* Don't deal with this again. */
}
/*

2
arch/mips/kernel/signal.c
View file

@ -429,7 +429,6 @@ void do_signal(struct pt_regs *regs)
else
oldset = &current->blocked;
signr = get_signal_to_deliver(&info, &ka, regs, NULL);
if (signr > 0) {
/* Whee! Actually deliver the signal. */
@ -464,6 +463,7 @@ void do_signal(struct pt_regs *regs)
regs->regs[7] = regs->regs[26];
regs->cp0_epc -= 4;
}
regs->regs[0] = 0; /* Don't deal with this again. */
}
/*

1
arch/mips/kernel/signal32.c
View file

@ -854,6 +854,7 @@ void do_signal32(struct pt_regs *regs)
regs->regs[7] = regs->regs[26];
regs->cp0_epc -= 4;
}
regs->regs[0] = 0; /* Don't deal with this again. */
}
/*