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On Fri, Sep 24, 2004 at 10:25:11PM -0500, Paul Fulghum wrote: > My suggestion was flawed in that it could > violate POSIX requirements (as Russell pointed out). > > Removing the lock from tty_termios_baud_rate(), tty_io.c > corrects the problem for the path from change_termios() > to tty_termios_baud_rate(), which is causing the deadlock. > > This may not be, and probably is not, > correct for all paths to tty_termios_baud_rate(). I wonder if we should consider adding: WARN_ON(!spin_is_locked(&tty_termios_lock)); in there. However, the one annoying thing about "spin_is_locked" is that, on UP, it defaults to "unlocked" which makes these kinds of checks too noisy. Maybe we need a spin_is_locked() with a bias towards being locked for UP? -- Russell King Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/ maintainer of: 2.6 PCMCIA - http://pcmcia.arm.linux.org.uk/ 2.6 Serial core - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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