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path: root/drivers/tty/serial/pmac_zilog.c
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Diffstat (limited to 'drivers/tty/serial/pmac_zilog.c')
-rw-r--r--drivers/tty/serial/pmac_zilog.c30
1 files changed, 14 insertions, 16 deletions
diff --git a/drivers/tty/serial/pmac_zilog.c b/drivers/tty/serial/pmac_zilog.c
index 73a3f295e7c4..b1785f58b6e3 100644
--- a/drivers/tty/serial/pmac_zilog.c
+++ b/drivers/tty/serial/pmac_zilog.c
@@ -227,21 +227,19 @@ static void pmz_interrupt_control(struct uart_pmac_port *uap, int enable)
write_zsreg(uap, R1, uap->curregs[1]);
}
-static struct tty_struct *pmz_receive_chars(struct uart_pmac_port *uap)
+static bool pmz_receive_chars(struct uart_pmac_port *uap)
{
struct tty_port *port;
- struct tty_struct *tty = NULL;
unsigned char ch, r1, drop, error, flag;
int loops = 0;
/* Sanity check, make sure the old bug is no longer happening */
- if (uap->port.state == NULL || uap->port.state->port.tty == NULL) {
+ if (uap->port.state == NULL) {
WARN_ON(1);
(void)read_zsdata(uap);
- return NULL;
+ return false;
}
port = &uap->port.state->port;
- tty = port->tty; /* TOCTOU above */
while (1) {
error = 0;
@@ -330,11 +328,11 @@ static struct tty_struct *pmz_receive_chars(struct uart_pmac_port *uap)
break;
}
- return tty;
+ return true;
flood:
pmz_interrupt_control(uap, 0);
pmz_error("pmz: rx irq flood !\n");
- return tty;
+ return true;
}
static void pmz_status_handle(struct uart_pmac_port *uap)
@@ -455,7 +453,7 @@ static irqreturn_t pmz_interrupt(int irq, void *dev_id)
struct uart_pmac_port *uap_a;
struct uart_pmac_port *uap_b;
int rc = IRQ_NONE;
- struct tty_struct *tty;
+ bool push;
u8 r3;
uap_a = pmz_get_port_A(uap);
@@ -468,7 +466,7 @@ static irqreturn_t pmz_interrupt(int irq, void *dev_id)
pmz_debug("irq, r3: %x\n", r3);
#endif
/* Channel A */
- tty = NULL;
+ push = false;
if (r3 & (CHAEXT | CHATxIP | CHARxIP)) {
if (!ZS_IS_OPEN(uap_a)) {
pmz_debug("ChanA interrupt while not open !\n");
@@ -479,21 +477,21 @@ static irqreturn_t pmz_interrupt(int irq, void *dev_id)
if (r3 & CHAEXT)
pmz_status_handle(uap_a);
if (r3 & CHARxIP)
- tty = pmz_receive_chars(uap_a);
+ push = pmz_receive_chars(uap_a);
if (r3 & CHATxIP)
pmz_transmit_chars(uap_a);
rc = IRQ_HANDLED;
}
skip_a:
spin_unlock(&uap_a->port.lock);
- if (tty != NULL)
- tty_flip_buffer_push(tty);
+ if (push)
+ tty_flip_buffer_push(&uap->port.state->port);
if (!uap_b)
goto out;
spin_lock(&uap_b->port.lock);
- tty = NULL;
+ push = false;
if (r3 & (CHBEXT | CHBTxIP | CHBRxIP)) {
if (!ZS_IS_OPEN(uap_b)) {
pmz_debug("ChanB interrupt while not open !\n");
@@ -504,15 +502,15 @@ static irqreturn_t pmz_interrupt(int irq, void *dev_id)
if (r3 & CHBEXT)
pmz_status_handle(uap_b);
if (r3 & CHBRxIP)
- tty = pmz_receive_chars(uap_b);
+ push = pmz_receive_chars(uap_b);
if (r3 & CHBTxIP)
pmz_transmit_chars(uap_b);
rc = IRQ_HANDLED;
}
skip_b:
spin_unlock(&uap_b->port.lock);
- if (tty != NULL)
- tty_flip_buffer_push(tty);
+ if (push)
+ tty_flip_buffer_push(&uap->port.state->port);
out:
return rc;