[PATCH] Fix some ucLinux breakage from the tty updates

Breakage reported by Adrian Bunk

Untested (no hardware)

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 10 insertions, 15 deletions

diff --git a/arch/v850/kernel/simcons.c b/arch/v850/kernel/simcons.c
index 7f0efaa025c9..3975aa02cef8 100644
--- a/arch/v850/kernel/simcons.c
+++ b/arch/v850/kernel/simcons.c
@@ -117,6 +117,7 @@ late_initcall(simcons_tty_init);
    tty driver.  */
 void simcons_poll_tty (struct tty_struct *tty)
 {
+        char buf[32];   /* Not the nicest way to do it but I need it correct first */
         int flip = 0, send_break = 0;
         struct pollfd pfd;
         pfd.fd = 0;
@@ -124,21 +125,15 @@ void simcons_poll_tty (struct tty_struct *tty)
 
         if (V850_SIM_SYSCALL (poll, &pfd, 1, 0) > 0) {
                 if (pfd.revents & POLLIN) {
-                        int left = TTY_FLIPBUF_SIZE - tty->flip.count;
-
-                        if (left > 0) {
-                                unsigned char *buf = tty->flip.char_buf_ptr;
-                                int rd = V850_SIM_SYSCALL (read, 0, buf, left);
-
-                                if (rd > 0) {
-                                        tty->flip.count += rd;
-                                        tty->flip.char_buf_ptr += rd;
-                                        memset (tty->flip.flag_buf_ptr, 0, rd);
-                                        tty->flip.flag_buf_ptr += rd;
-                                        flip = 1;
-                                } else
-                                        send_break = 1;
-                        }
+                        /* Real block hardware knows the transfer size before
+                           transfer so the new tty buffering doesn't try to handle
+                           this rather weird simulator specific case well */
+                        int rd = V850_SIM_SYSCALL (read, 0, buf, 32);
+                        if (rd > 0) {
+                                tty_insert_flip_string(tty, buf, rd);
+                                flip = 1;
+                        } else
+                                send_break = 1;
                 } else if (pfd.revents & POLLERR)
                         send_break = 1;
         }