[PATCH] hvc_console: Separate the NUL character filtering from get_hvc_chars

Separate the NUL character filtering from get_hvc_chars.

Signed-off-by: Milton Miller <miltonm@bga.com>
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 23 insertions, 1 deletions

diff --git a/drivers/char/hvc_vio.c b/drivers/char/hvc_vio.c
index 430a2c284ad2..60bb9152b832 100644
--- a/drivers/char/hvc_vio.c
+++ b/drivers/char/hvc_vio.c
@@ -43,8 +43,30 @@ static struct vio_device_id hvc_driver_table[] __devinitdata = {
 };
 MODULE_DEVICE_TABLE(vio, hvc_driver_table);
 
+static int filtered_get_chars(uint32_t vtermno, char *buf, int count)
+{
+        unsigned long got;
+        int i;
+
+        got = hvc_get_chars(vtermno, buf, count);
+
+        /*
+         * Work around a HV bug where it gives us a null
+         * after every \r.  -- paulus
+         */
+        for (i = 1; i < got; ++i) {
+                if (buf[i] == 0 && buf[i-1] == '\r') {
+                        --got;
+                        if (i < got)
+                                memmove(&buf[i], &buf[i+1],
+                                        got - i);
+                }
+        }
+        return got;
+}
+
 static struct hv_ops hvc_get_put_ops = {
-        .get_chars = hvc_get_chars,
+        .get_chars = filtered_get_chars,
         .put_chars = hvc_put_chars,
 };