1 files changed, 13 insertions, 7 deletions

diff --git a/drivers/char/pcmcia/synclink_cs.c b/drivers/char/pcmcia/synclink_cs.c
index 0a484b4a1b02..a6b8ddea2227 100644
--- a/drivers/char/pcmcia/synclink_cs.c
+++ b/drivers/char/pcmcia/synclink_cs.c
@@ -891,6 +891,14 @@ static void rx_ready_async(MGSLPC_INFO *info, int tcd, struct tty_struct *tty)
         int work = 0;
         struct mgsl_icount *icount = &info->icount;
 
+        if (!tty) {
+                /* tty is not available anymore */
+                issue_command(info, CHA, CMD_RXRESET);
+                if (debug_level >= DEBUG_LEVEL_ISR)
+                        printk("%s(%d):rx_ready_async(tty=NULL)\n",__FILE__,__LINE__);
+                return;
+        }
+
         if (tcd) {
                 /* early termination, get FIFO count from RBCL register */
                 fifo_count = (unsigned char)(read_reg(info, CHA+RBCL) & 0x1f);
@@ -980,7 +988,7 @@ static void tx_done(MGSLPC_INFO *info, struct tty_struct *tty)
         else
 #endif
         {
-                if (tty->stopped || tty->hw_stopped) {
+                if (tty && (tty->stopped || tty->hw_stopped)) {
                         tx_stop(info);
                         return;
                 }
@@ -1000,7 +1008,7 @@ static void tx_ready(MGSLPC_INFO *info, struct tty_struct *tty)
                 if (!info->tx_active)
                         return;
         } else {
-                if (tty->stopped || tty->hw_stopped) {
+                if (tty && (tty->stopped || tty->hw_stopped)) {
                         tx_stop(info);
                         return;
                 }
@@ -1050,13 +1058,12 @@ static void cts_change(MGSLPC_INFO *info, struct tty_struct *tty)
         wake_up_interruptible(&info->status_event_wait_q);
         wake_up_interruptible(&info->event_wait_q);
 
-        if (info->port.flags & ASYNC_CTS_FLOW) {
+        if (tty && (info->port.flags & ASYNC_CTS_FLOW)) {
                 if (tty->hw_stopped) {
                         if (info->serial_signals & SerialSignal_CTS) {
                                 if (debug_level >= DEBUG_LEVEL_ISR)
                                         printk("CTS tx start...");
-                                if (tty)
-                                        tty->hw_stopped = 0;
+                                tty->hw_stopped = 0;
                                 tx_start(info, tty);
                                 info->pending_bh |= BH_TRANSMIT;
                                 return;
@@ -1065,8 +1072,7 @@ static void cts_change(MGSLPC_INFO *info, struct tty_struct *tty)
                         if (!(info->serial_signals & SerialSignal_CTS)) {
                                 if (debug_level >= DEBUG_LEVEL_ISR)
                                         printk("CTS tx stop...");
-                                if (tty)
-                                        tty->hw_stopped = 1;
+                                tty->hw_stopped = 1;
                                 tx_stop(info);
                         }
                 }