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tty: moxa: split open lock 

moxa_openlock is used for several situations where we want to handle the
case of an ioctl that crosses many ports (not just the open tty), and also
cases where an open races a deinit (eg a pci unplug) and we hangup a port
before we can cope with that.

The non open race cases can use the moxa_lock spinlock. This simplifies sorting
out the remaining mess.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Cox 2009-11-30 13:18:24 +00:00 committed by Greg Kroah-Hartman
parent f710ebd7f7
commit e8c62103fd
1 changed files with 11 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
drivers/char/moxa.c
View File

@ -163,6 +163,7 @@ static struct mon_str moxaLog;
static unsigned int moxaFuncTout = HZ / 2;
static unsigned int moxaLowWaterChk;
static DEFINE_MUTEX(moxa_openlock);
static DEFINE_SPINLOCK(moxa_lock);
/* Variables for insmod */
#ifdef MODULE
static unsigned long baseaddr[MAX_BOARDS];
@ -313,22 +314,20 @@ static int moxa_ioctl(struct tty_struct *tty, struct file *file,
struct moxa_port *p;
unsigned int i, j;
mutex_lock(&moxa_openlock);
for (i = 0; i < MAX_BOARDS; i++) {
p = moxa_boards[i].ports;
for (j = 0; j < MAX_PORTS_PER_BOARD; j++, p++, argm++) {
memset(&tmp, 0, sizeof(tmp));
spin_lock_bh(&moxa_lock);
if (moxa_boards[i].ready) {
tmp.inq = MoxaPortRxQueue(p);
tmp.outq = MoxaPortTxQueue(p);
}
if (copy_to_user(argm, &tmp, sizeof(tmp))) {
mutex_unlock(&moxa_openlock);
spin_unlock_bh(&moxa_lock);
if (copy_to_user(argm, &tmp, sizeof(tmp)))
return -EFAULT;
}
}
}
mutex_unlock(&moxa_openlock);
break;
} case MOXA_GET_OQUEUE:
status = MoxaPortTxQueue(ch);
@ -344,16 +343,20 @@ static int moxa_ioctl(struct tty_struct *tty, struct file *file,
struct moxa_port *p;
unsigned int i, j;
mutex_lock(&moxa_openlock);
for (i = 0; i < MAX_BOARDS; i++) {
p = moxa_boards[i].ports;
for (j = 0; j < MAX_PORTS_PER_BOARD; j++, p++, argm++) {
struct tty_struct *ttyp;
memset(&tmp, 0, sizeof(tmp));
if (!moxa_boards[i].ready)
spin_lock_bh(&moxa_lock);
if (!moxa_boards[i].ready) {
spin_unlock_bh(&moxa_lock);
goto copy;
}
status = MoxaPortLineStatus(p);
spin_unlock_bh(&moxa_lock);
if (status & 1)
tmp.cts = 1;
if (status & 2)
@ -368,13 +371,10 @@ static int moxa_ioctl(struct tty_struct *tty, struct file *file,
tmp.cflag = ttyp->termios->c_cflag;
tty_kref_put(tty);
copy:
if (copy_to_user(argm, &tmp, sizeof(tmp))) {
mutex_unlock(&moxa_openlock);
if (copy_to_user(argm, &tmp, sizeof(tmp)))
return -EFAULT;
}
}
}
mutex_unlock(&moxa_openlock);
break;
}
case TIOCGSERIAL:
@ -427,7 +427,6 @@ static const struct tty_port_operations moxa_port_ops = {
static struct tty_driver *moxaDriver;
static DEFINE_TIMER(moxaTimer, moxa_poll, 0, 0);
static DEFINE_SPINLOCK(moxa_lock);
/*
* HW init