From: Jiri Slaby Date: Mon, 2 Apr 2012 11:54:18 +0000 (+0200) Subject: TTY: tty3270, add tty_port X-Git-Tag: firefly_0821_release~3680^2~2824^2~30^2~55 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=ba186e7d17ea874f2a56385806e0ef213f58a1dd;p=firefly-linux-kernel-4.4.55.git TTY: tty3270, add tty_port And use tty from that. This means, we convert most of the users to accept tty_port instead. This is not racy and ensures the tty to be properly refcounted. Signed-off-by: Jiri Slaby Cc: Martin Schwidefsky Cc: Heiko Carstens Cc: linux390@de.ibm.com Cc: linux-s390@vger.kernel.org Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/s390/char/keyboard.c b/drivers/s390/char/keyboard.c index 806588192483..7ef9cfdc17d8 100644 --- a/drivers/s390/char/keyboard.c +++ b/drivers/s390/char/keyboard.c @@ -199,7 +199,7 @@ handle_diacr(struct kbd_data *kbd, unsigned int ch) if (ch == ' ' || ch == d) return d; - kbd_put_queue(kbd->tty, d); + kbd_put_queue(kbd->port, d); return ch; } @@ -221,7 +221,7 @@ k_self(struct kbd_data *kbd, unsigned char value) { if (kbd->diacr) value = handle_diacr(kbd, value); - kbd_put_queue(kbd->tty, value); + kbd_put_queue(kbd->port, value); } /* @@ -239,7 +239,7 @@ static void k_fn(struct kbd_data *kbd, unsigned char value) { if (kbd->func_table[value]) - kbd_puts_queue(kbd->tty, kbd->func_table[value]); + kbd_puts_queue(kbd->port, kbd->func_table[value]); } static void @@ -257,20 +257,20 @@ k_spec(struct kbd_data *kbd, unsigned char value) * but we need only 16 bits here */ static void -to_utf8(struct tty_struct *tty, ushort c) +to_utf8(struct tty_port *port, ushort c) { if (c < 0x80) /* 0******* */ - kbd_put_queue(tty, c); + kbd_put_queue(port, c); else if (c < 0x800) { /* 110***** 10****** */ - kbd_put_queue(tty, 0xc0 | (c >> 6)); - kbd_put_queue(tty, 0x80 | (c & 0x3f)); + kbd_put_queue(port, 0xc0 | (c >> 6)); + kbd_put_queue(port, 0x80 | (c & 0x3f)); } else { /* 1110**** 10****** 10****** */ - kbd_put_queue(tty, 0xe0 | (c >> 12)); - kbd_put_queue(tty, 0x80 | ((c >> 6) & 0x3f)); - kbd_put_queue(tty, 0x80 | (c & 0x3f)); + kbd_put_queue(port, 0xe0 | (c >> 12)); + kbd_put_queue(port, 0x80 | ((c >> 6) & 0x3f)); + kbd_put_queue(port, 0x80 | (c & 0x3f)); } } @@ -283,7 +283,7 @@ kbd_keycode(struct kbd_data *kbd, unsigned int keycode) unsigned short keysym; unsigned char type, value; - if (!kbd || !kbd->tty) + if (!kbd) return; if (keycode >= 384) @@ -323,7 +323,7 @@ kbd_keycode(struct kbd_data *kbd, unsigned int keycode) #endif (*k_handler[type])(kbd, value); } else - to_utf8(kbd->tty, keysym); + to_utf8(kbd->port, keysym); } /* @@ -457,6 +457,7 @@ do_kdgkb_ioctl(struct kbd_data *kbd, struct kbsentry __user *u_kbs, int kbd_ioctl(struct kbd_data *kbd, unsigned int cmd, unsigned long arg) { + struct tty_struct *tty; void __user *argp; unsigned int ct; int perm; @@ -467,7 +468,10 @@ int kbd_ioctl(struct kbd_data *kbd, unsigned int cmd, unsigned long arg) * To have permissions to do most of the vt ioctls, we either have * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG. */ - perm = current->signal->tty == kbd->tty || capable(CAP_SYS_TTY_CONFIG); + tty = tty_port_tty_get(kbd->port); + /* FIXME this test is pretty racy */ + perm = current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG); + tty_kref_put(tty); switch (cmd) { case KDGKBTYPE: return put_user(KB_101, (char __user *)argp); diff --git a/drivers/s390/char/keyboard.h b/drivers/s390/char/keyboard.h index 7e736aaeae6e..f682f4e49680 100644 --- a/drivers/s390/char/keyboard.h +++ b/drivers/s390/char/keyboard.h @@ -21,7 +21,7 @@ typedef void (fn_handler_fn)(struct kbd_data *); */ struct kbd_data { - struct tty_struct *tty; + struct tty_port *port; unsigned short **key_maps; char **func_table; fn_handler_fn **fn_handler; @@ -42,16 +42,24 @@ int kbd_ioctl(struct kbd_data *, unsigned int, unsigned long); * Helper Functions. */ static inline void -kbd_put_queue(struct tty_struct *tty, int ch) +kbd_put_queue(struct tty_port *port, int ch) { + struct tty_struct *tty = tty_port_tty_get(port); + if (!tty) + return; tty_insert_flip_char(tty, ch, 0); tty_schedule_flip(tty); + tty_kref_put(tty); } static inline void -kbd_puts_queue(struct tty_struct *tty, char *cp) +kbd_puts_queue(struct tty_port *port, char *cp) { + struct tty_struct *tty = tty_port_tty_get(port); + if (!tty) + return; while (*cp) tty_insert_flip_char(tty, *cp++, 0); tty_schedule_flip(tty); + tty_kref_put(tty); } diff --git a/drivers/s390/char/tty3270.c b/drivers/s390/char/tty3270.c index 1f4aff78eaca..10ec690197cb 100644 --- a/drivers/s390/char/tty3270.c +++ b/drivers/s390/char/tty3270.c @@ -61,7 +61,7 @@ struct tty3270_line { */ struct tty3270 { struct raw3270_view view; - struct tty_struct *tty; /* Pointer to tty structure */ + struct tty_port port; void **freemem_pages; /* Array of pages used for freemem. */ struct list_head freemem; /* List of free memory for strings. */ @@ -449,10 +449,9 @@ tty3270_rcl_add(struct tty3270 *tp, char *input, int len) static void tty3270_rcl_backward(struct kbd_data *kbd) { - struct tty3270 *tp; + struct tty3270 *tp = container_of(kbd->port, struct tty3270, port); struct string *s; - tp = kbd->tty->driver_data; spin_lock_bh(&tp->view.lock); if (tp->inattr == TF_INPUT) { if (tp->rcl_walk && tp->rcl_walk->prev != &tp->rcl_lines) @@ -477,9 +476,8 @@ tty3270_rcl_backward(struct kbd_data *kbd) static void tty3270_exit_tty(struct kbd_data *kbd) { - struct tty3270 *tp; + struct tty3270 *tp = container_of(kbd->port, struct tty3270, port); - tp = kbd->tty->driver_data; raw3270_deactivate_view(&tp->view); } @@ -489,10 +487,9 @@ tty3270_exit_tty(struct kbd_data *kbd) static void tty3270_scroll_forward(struct kbd_data *kbd) { - struct tty3270 *tp; + struct tty3270 *tp = container_of(kbd->port, struct tty3270, port); int nr_up; - tp = kbd->tty->driver_data; spin_lock_bh(&tp->view.lock); nr_up = tp->nr_up - tp->view.rows + 2; if (nr_up < 0) @@ -512,10 +509,9 @@ tty3270_scroll_forward(struct kbd_data *kbd) static void tty3270_scroll_backward(struct kbd_data *kbd) { - struct tty3270 *tp; + struct tty3270 *tp = container_of(kbd->port, struct tty3270, port); int nr_up; - tp = kbd->tty->driver_data; spin_lock_bh(&tp->view.lock); nr_up = tp->nr_up + tp->view.rows - 2; if (nr_up + tp->view.rows - 2 > tp->nr_lines) @@ -575,13 +571,10 @@ tty3270_read_tasklet(struct raw3270_request *rrq) raw3270_request_add_data(tp->kreset, &kreset_data, 1); raw3270_start(&tp->view, tp->kreset); - /* Emit input string. */ - if (tp->tty) { - while (len-- > 0) - kbd_keycode(tp->kbd, *input++); - /* Emit keycode for AID byte. */ - kbd_keycode(tp->kbd, 256 + tp->input->string[0]); - } + while (len-- > 0) + kbd_keycode(tp->kbd, *input++); + /* Emit keycode for AID byte. */ + kbd_keycode(tp->kbd, 256 + tp->input->string[0]); raw3270_request_reset(rrq); xchg(&tp->read, rrq); @@ -691,6 +684,7 @@ tty3270_alloc_view(void) INIT_LIST_HEAD(&tp->update); INIT_LIST_HEAD(&tp->rcl_lines); tp->rcl_max = 20; + tty_port_init(&tp->port); setup_timer(&tp->timer, (void (*)(unsigned long)) tty3270_update, (unsigned long) tp); tasklet_init(&tp->readlet, @@ -802,14 +796,14 @@ static void tty3270_release(struct raw3270_view *view) { struct tty3270 *tp = container_of(view, struct tty3270, view); - struct tty_struct *tty; + struct tty_struct *tty = tty_port_tty_get(&tp->port); - tty = tp->tty; if (tty) { tty->driver_data = NULL; - tp->tty = tp->kbd->tty = NULL; + tty_port_tty_set(&tp->port, NULL); tty_hangup(tty); raw3270_put_view(&tp->view); + tty_kref_put(tty); } } @@ -869,8 +863,8 @@ tty3270_open(struct tty_struct *tty, struct file * filp) tty->winsize.ws_row = tp->view.rows - 2; tty->winsize.ws_col = tp->view.cols; tty->low_latency = 0; - tp->tty = tty; - tp->kbd->tty = tty; + /* why to reassign? */ + tty_port_tty_set(&tp->port, tty); tp->inattr = TF_INPUT; return 0; } @@ -900,7 +894,7 @@ tty3270_open(struct tty_struct *tty, struct file * filp) return rc; } - tp->tty = tty; + tty_port_tty_set(&tp->port, tty); tty->low_latency = 0; tty->driver_data = tp; tty->winsize.ws_row = tp->view.rows - 2; @@ -914,7 +908,7 @@ tty3270_open(struct tty_struct *tty, struct file * filp) for (i = 0; i < tp->view.rows - 2; i++) tty3270_blank_line(tp); - tp->kbd->tty = tty; + tp->kbd->port = &tp->port; tp->kbd->fn_handler[KVAL(K_INCRCONSOLE)] = tty3270_exit_tty; tp->kbd->fn_handler[KVAL(K_SCROLLBACK)] = tty3270_scroll_backward; tp->kbd->fn_handler[KVAL(K_SCROLLFORW)] = tty3270_scroll_forward; @@ -938,7 +932,7 @@ tty3270_close(struct tty_struct *tty, struct file * filp) return; if (tp) { tty->driver_data = NULL; - tp->tty = tp->kbd->tty = NULL; + tty_port_tty_set(&tp->port, NULL); raw3270_put_view(&tp->view); } } @@ -1387,7 +1381,7 @@ tty3270_escape_sequence(struct tty3270 *tp, char ch) tty3270_lf(tp); break; case 'Z': /* Respond ID. */ - kbd_puts_queue(tp->tty, "\033[?6c"); + kbd_puts_queue(&tp->port, "\033[?6c"); break; case '7': /* Save cursor position. */ tp->saved_cx = tp->cx; @@ -1433,11 +1427,11 @@ tty3270_escape_sequence(struct tty3270 *tp, char ch) tp->esc_state = ESnormal; if (ch == 'n' && !tp->esc_ques) { if (tp->esc_par[0] == 5) /* Status report. */ - kbd_puts_queue(tp->tty, "\033[0n"); + kbd_puts_queue(&tp->port, "\033[0n"); else if (tp->esc_par[0] == 6) { /* Cursor report. */ char buf[40]; sprintf(buf, "\033[%d;%dR", tp->cy + 1, tp->cx + 1); - kbd_puts_queue(tp->tty, buf); + kbd_puts_queue(&tp->port, buf); } return; }