Konstantin Belousov 316d90a37b Move the check for the snp device being already attached after the ... fget() call, that is sleeping point, and possibly dropping Giant. The snp_target == NULL implies the snp_tty == NULL. Remove the code that is put under snp_target == NULL and snp_tty != NULL clause. In snpclose(), do the snp_detach() before scheduling the snp device destruction. Otherwise, after the return from snpclose(), the snp device is already removed from the snp_list, but tty is still in snooped state. Any attempt to do i/o on such tty cause panic because ttytosnp() returns NULL. Tested by: Peter Holm MFC after: 1 week		2007-12-24 13:47:16 +00:00
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snp.c	Move the check for the snp device being already attached after the	2007-12-24 13:47:16 +00:00