USB: tty: Add a function to insert a string of characters with the same flag

The USB drivers often want to insert a series of bytes all with the same
flag set - provide a helper for this case.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

2 files changed, 12 insertions, 6 deletions

diff --git a/drivers/char/tty_buffer.c b/drivers/char/tty_buffer.c
index 66fa4e10d76b..4c133459ab7e 100644
--- a/drivers/char/tty_buffer.c
+++ b/drivers/char/tty_buffer.c
@@ -231,9 +231,10 @@ int tty_buffer_request_room(struct tty_struct *tty, size_t size)
 EXPORT_SYMBOL_GPL(tty_buffer_request_room);
 
 /**
- *      tty_insert_flip_string  -       Add characters to the tty buffer
+ *      tty_insert_flip_string_fixed_flag - Add characters to the tty buffer
  *      @tty: tty structure
  *      @chars: characters
+ *      @flag: flag value for each character
  *      @size: size
  *
  *      Queue a series of bytes to the tty buffering. All the characters
@@ -242,8 +243,8 @@ EXPORT_SYMBOL_GPL(tty_buffer_request_room);
  *      Locking: Called functions may take tty->buf.lock
  */
 
-int tty_insert_flip_string(struct tty_struct *tty, const unsigned char *chars,
-                                size_t size)
+int tty_insert_flip_string_fixed_flag(struct tty_struct *tty,
+                const unsigned char *chars, char flag, size_t size)
 {
         int copied = 0;
         do {
@@ -253,7 +254,7 @@ int tty_insert_flip_string(struct tty_struct *tty, const unsigned char *chars,
                 if (unlikely(space == 0))
                         break;
                 memcpy(tb->char_buf_ptr + tb->used, chars, space);
-                memset(tb->flag_buf_ptr + tb->used, TTY_NORMAL, space);
+                memset(tb->flag_buf_ptr + tb->used, flag, space);
                 tb->used += space;
                 copied += space;
                 chars += space;
@@ -262,7 +263,7 @@ int tty_insert_flip_string(struct tty_struct *tty, const unsigned char *chars,
         } while (unlikely(size > copied));
         return copied;
 }
-EXPORT_SYMBOL(tty_insert_flip_string);
+EXPORT_SYMBOL(tty_insert_flip_string_fixed_flag);
 
 /**
  *      tty_insert_flip_string_flags    -       Add characters to the tty buffer
diff --git a/include/linux/tty_flip.h b/include/linux/tty_flip.h
index eb677cf56106..9239d033a0a3 100644
--- a/include/linux/tty_flip.h
+++ b/include/linux/tty_flip.h
@@ -2,8 +2,8 @@
 #define _LINUX_TTY_FLIP_H
 
 extern int tty_buffer_request_room(struct tty_struct *tty, size_t size);
-extern int tty_insert_flip_string(struct tty_struct *tty, const unsigned char *chars, size_t size);
 extern int tty_insert_flip_string_flags(struct tty_struct *tty, const unsigned char *chars, const char *flags, size_t size);
+extern int tty_insert_flip_string_fixed_flag(struct tty_struct *tty, const unsigned char *chars, char flag, size_t size);
 extern int tty_prepare_flip_string(struct tty_struct *tty, unsigned char **chars, size_t size);
 extern int tty_prepare_flip_string_flags(struct tty_struct *tty, unsigned char **chars, char **flags, size_t size);
 void tty_schedule_flip(struct tty_struct *tty);
@@ -20,4 +20,9 @@ static inline int tty_insert_flip_char(struct tty_struct *tty,
         return tty_insert_flip_string_flags(tty, &ch, &flag, 1);
 }
 
+static inline int tty_insert_flip_string(struct tty_struct *tty, const unsigned char *chars, size_t size)
+{
+        return tty_insert_flip_string_fixed_flag(tty, chars, TTY_NORMAL, size);
+}
+
 #endif /* _LINUX_TTY_FLIP_H */