Currently, if the cursor position is not at the end of the command buffer and the user uses the Tab-complete functions, then the console does not leave the cursor in the correct position.
For example consider the following buffer with the cursor positioned at the ^:
md kdb_pro 10 ^
Pressing tab should result in:
md kdb_prompt_str 10 ^
However this does not happen. Instead the cursor is placed at the end (after then 10) and further cursor movement redraws incorrectly. The same problem exists when we double-Tab but in a different part of the code.
Fix this by sending a carriage return and then redisplaying the text to the left of the cursor.
Cc: stable@vger.kernel.org Signed-off-by: Daniel Thompson daniel.thompson@linaro.org --- kernel/debug/kdb/kdb_io.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/kernel/debug/kdb/kdb_io.c b/kernel/debug/kdb/kdb_io.c index a42607e4d1aba..69549fe42e87b 100644 --- a/kernel/debug/kdb/kdb_io.c +++ b/kernel/debug/kdb/kdb_io.c @@ -364,6 +364,8 @@ static char *kdb_read(char *buffer, size_t bufsize) kdb_printf("\n"); kdb_printf(kdb_prompt_str); kdb_printf("%s", buffer); + if (cp != lastchar) + kdb_position_cursor(kdb_prompt_str, buffer, cp); } else if (tab != 2 && count > 0) { /* How many new characters do we want from tmpbuffer? */ len_tmp = strlen(p_tmp) - len; @@ -377,6 +379,9 @@ static char *kdb_read(char *buffer, size_t bufsize) kdb_printf("%s", cp); cp += len_tmp; lastchar += len_tmp; + if (cp != lastchar) + kdb_position_cursor(kdb_prompt_str, + buffer, cp); } } kdb_nextline = 1; /* reset output line number */