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906cbe1364
We used it really only serial and ami_serial. The rest of the callsites were BUG/WARN_ONs to check if BTM is held. Now that we pruned tty_locked from both of the real users, we can get rid of tty_lock along with __big_tty_mutex_owner. Signed-off-by: Jiri Slaby <jslaby@suse.cz> Acked-by: Arnd Bergmann <arnd@arndb.de> Cc: Alan Cox <alan@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
33 lines
659 B
C
33 lines
659 B
C
#include <linux/tty.h>
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#include <linux/module.h>
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#include <linux/kallsyms.h>
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#include <linux/semaphore.h>
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#include <linux/sched.h>
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/*
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* The 'big tty mutex'
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*
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* This mutex is taken and released by tty_lock() and tty_unlock(),
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* replacing the older big kernel lock.
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* It can no longer be taken recursively, and does not get
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* released implicitly while sleeping.
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*
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* Don't use in new code.
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*/
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static DEFINE_MUTEX(big_tty_mutex);
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/*
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* Getting the big tty mutex.
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*/
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void __lockfunc tty_lock(void)
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{
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mutex_lock(&big_tty_mutex);
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}
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EXPORT_SYMBOL(tty_lock);
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void __lockfunc tty_unlock(void)
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{
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mutex_unlock(&big_tty_mutex);
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}
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EXPORT_SYMBOL(tty_unlock);
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