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Hold thread reference while we frob cdevsw.

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This commit is contained in:
phk 2004-09-24 08:12:41 +00:00
parent a67be8b6be
commit 5dd2cd84fe
1 changed files with 9 additions and 3 deletions
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12
sys/dev/snp/snp.c
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@ -184,11 +184,17 @@ snpdevtotty(dev)
struct cdev *dev;
{
struct cdevsw *cdp;
struct tty *tp;
cdp = devsw(dev);
if (cdp == NULL || (cdp->d_flags & D_TTY) == 0)
cdp = dev_refthread(dev);
if (cdp == NULL)
return (NULL);
return (dev->si_tty);
if (!(cdp->d_flags & D_TTY))
tp = NULL;
else
tp = dev->si_tty;
dev_relthread(dev);
return (tp);
}
#define SNP_INPUT_BUF 5 /* This is even too much, the maximal