[IRDA]: stir4200 fixes.

From: Olaf Hartmann <olaf.hartmann@s1998.tu-chemnitz.de>

The attached patch observes the stir4200 fifo size and will clear the
fifo, if the size is increasing, while it should be transmitting bytes

Signed-off-by: Samuel Ortiz <samuel@sortiz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 4 deletions

diff --git a/drivers/net/irda/stir4200.c b/drivers/net/irda/stir4200.c
index 042bc2f0417d..e59c485bc497 100644
--- a/drivers/net/irda/stir4200.c
+++ b/drivers/net/irda/stir4200.c
@@ -142,9 +142,6 @@ enum StirCtrl2Mask {
 };
 
 enum StirFifoCtlMask {
-        FIFOCTL_EOF = 0x80,
-        FIFOCTL_UNDER = 0x40,
-        FIFOCTL_OVER = 0x20,
         FIFOCTL_DIR = 0x10,
         FIFOCTL_CLR = 0x08,
         FIFOCTL_EMPTY = 0x04,
@@ -594,9 +591,10 @@ static int fifo_txwait(struct stir_cb *stir, int space)
 {
         int err;
         unsigned long count, status;
+        unsigned long prev_count = 0x1fff;
 
         /* Read FIFO status and count */
-        for(;;) {
+        for (;; prev_count = count) {
                 err = read_reg(stir, REG_FIFOCTL, stir->fifo_status, 
                                    FIFO_REGS_SIZE);
                 if (unlikely(err != FIFO_REGS_SIZE)) {
@@ -629,6 +627,10 @@ static int fifo_txwait(struct stir_cb *stir, int space)
                 if (space >= 0 && STIR_FIFO_SIZE - 4 > space + count)
                         return 0;
 
+                /* queue confused */
+                if (prev_count < count)
+                        break;
+
                 /* estimate transfer time for remaining chars */
                 msleep((count * 8000) / stir->speed);
         }