| User: | Jiri Slaby |
| Error type: | Leaving function in locked state |
| Error type description: | Some lock is not unlocked on all paths of a function, so it is leaked |
| File location: | drivers/char/generic_serial.c |
| Line in file: | 593 |
| Project: | Linux Kernel |
| Project version: | 2.6.28 |
| Tools: |
Undetermined 1
Stanse (1.2) |
| Entered: | 2012-03-04 17:07:06 UTC |
1/* 2 * generic_serial.c 3 * 4 * Copyright (C) 1998/1999 R.E.Wolff@BitWizard.nl 5 * 6 * written for the SX serial driver. 7 * Contains the code that should be shared over all the serial drivers. 8 * 9 * Credit for the idea to do it this way might go to Alan Cox. 10 * 11 * 12 * Version 0.1 -- December, 1998. Initial version. 13 * Version 0.2 -- March, 1999. Some more routines. Bugfixes. Etc. 14 * Version 0.5 -- August, 1999. Some more fixes. Reformat for Linus. 15 * 16 * BitWizard is actively maintaining this file. We sometimes find 17 * that someone submitted changes to this file. We really appreciate 18 * your help, but please submit changes through us. We're doing our 19 * best to be responsive. -- REW 20 * */ 21 22#include <linux/module.h> 23#include <linux/kernel.h> 24#include <linux/tty.h> 25#include <linux/serial.h> 26#include <linux/mm.h> 27#include <linux/generic_serial.h> 28#include <linux/interrupt.h> 29#include <linux/tty_flip.h> 30#include <linux/delay.h> 31#include <asm/uaccess.h> 32 33#define DEBUG 34 35static int gs_debug; 36 37#ifdef DEBUG 38#define gs_dprintk(f, str...) if (gs_debug & f) printk (str) 39#else 40#define gs_dprintk(f, str...) /* nothing */ 41#endif 42 43#define func_enter() gs_dprintk (GS_DEBUG_FLOW, "gs: enter %s\n", __func__) 44#define func_exit() gs_dprintk (GS_DEBUG_FLOW, "gs: exit %s\n", __func__) 45 46#define RS_EVENT_WRITE_WAKEUP 1 47 48module_param(gs_debug, int, 0644); 49 50 51int gs_put_char(struct tty_struct * tty, unsigned char ch) 52{ 53 struct gs_port *port; 54 55 func_enter (); 56 57 port = tty->driver_data; 58 59 if (!port) return 0; 60 61 if (! (port->port.flags & ASYNC_INITIALIZED)) return 0; 62 63 /* Take a lock on the serial tranmit buffer! */ 64 mutex_lock(& port->port_write_mutex); 65 66 if (port->xmit_cnt >= SERIAL_XMIT_SIZE - 1) { 67 /* Sorry, buffer is full, drop character. Update statistics???? -- REW */ 68 mutex_unlock(&port->port_write_mutex); 69 return 0; 70 } 71 72 port->xmit_buf[port->xmit_head++] = ch; 73 port->xmit_head &= SERIAL_XMIT_SIZE - 1; 74 port->xmit_cnt++; /* Characters in buffer */ 75 76 mutex_unlock(&port->port_write_mutex); 77 func_exit (); 78 return 1; 79} 80 81 82/* 83> Problems to take into account are: 84> -1- Interrupts that empty part of the buffer. 85> -2- page faults on the access to userspace. 86> -3- Other processes that are also trying to do a "write". 87*/ 88 89int gs_write(struct tty_struct * tty, 90 const unsigned char *buf, int count) 91{ 92 struct gs_port *port; 93 int c, total = 0; 94 int t; 95 96 func_enter (); 97 98 port = tty->driver_data; 99 100 if (!port) return 0; 101 102 if (! (port->port.flags & ASYNC_INITIALIZED)) 103 return 0; 104 105 /* get exclusive "write" access to this port (problem 3) */ 106 /* This is not a spinlock because we can have a disk access (page 107 fault) in copy_from_user */ 108 mutex_lock(& port->port_write_mutex); 109 110 while (1) { 111 112 c = count; 113 114 /* This is safe because we "OWN" the "head". Noone else can 115 change the "head": we own the port_write_mutex. */ 116 /* Don't overrun the end of the buffer */ 117 t = SERIAL_XMIT_SIZE - port->xmit_head; 118 if (t < c) c = t; 119 120 /* This is safe because the xmit_cnt can only decrease. This 121 would increase "t", so we might copy too little chars. */ 122 /* Don't copy past the "head" of the buffer */ 123 t = SERIAL_XMIT_SIZE - 1 - port->xmit_cnt; 124 if (t < c) c = t; 125 126 /* Can't copy more? break out! */ 127 if (c <= 0) break; 128 129 memcpy (port->xmit_buf + port->xmit_head, buf, c); 130 131 port -> xmit_cnt += c; 132 port -> xmit_head = (port->xmit_head + c) & (SERIAL_XMIT_SIZE -1); 133 buf += c; 134 count -= c; 135 total += c; 136 } 137 mutex_unlock(& port->port_write_mutex); 138 139 gs_dprintk (GS_DEBUG_WRITE, "write: interrupts are %s\n", 140 (port->port.flags & GS_TX_INTEN)?"enabled": "disabled"); 141 142 if (port->xmit_cnt && 143 !tty->stopped && 144 !tty->hw_stopped && 145 !(port->port.flags & GS_TX_INTEN)) { 146 port->port.flags |= GS_TX_INTEN; 147 port->rd->enable_tx_interrupts (port); 148 } 149 func_exit (); 150 return total; 151} 152 153 154 155int gs_write_room(struct tty_struct * tty) 156{ 157 struct gs_port *port = tty->driver_data; 158 int ret; 159 160 func_enter (); 161 ret = SERIAL_XMIT_SIZE - port->xmit_cnt - 1; 162 if (ret < 0) 163 ret = 0; 164 func_exit (); 165 return ret; 166} 167 168 169int gs_chars_in_buffer(struct tty_struct *tty) 170{ 171 struct gs_port *port = tty->driver_data; 172 func_enter (); 173 174 func_exit (); 175 return port->xmit_cnt; 176} 177 178 179static int gs_real_chars_in_buffer(struct tty_struct *tty) 180{ 181 struct gs_port *port; 182 func_enter (); 183 184 port = tty->driver_data; 185 186 if (!port->rd) return 0; 187 if (!port->rd->chars_in_buffer) return 0; 188 189 func_exit (); 190 return port->xmit_cnt + port->rd->chars_in_buffer (port); 191} 192 193 194static int gs_wait_tx_flushed (void * ptr, unsigned long timeout) 195{ 196 struct gs_port *port = ptr; 197 unsigned long end_jiffies; 198 int jiffies_to_transmit, charsleft = 0, rv = 0; 199 int rcib; 200 201 func_enter(); 202 203 gs_dprintk (GS_DEBUG_FLUSH, "port=%p.\n", port); 204 if (port) { 205 gs_dprintk (GS_DEBUG_FLUSH, "xmit_cnt=%x, xmit_buf=%p, tty=%p.\n", 206 port->xmit_cnt, port->xmit_buf, port->port.tty); 207 } 208 209 if (!port || port->xmit_cnt < 0 || !port->xmit_buf) { 210 gs_dprintk (GS_DEBUG_FLUSH, "ERROR: !port, !port->xmit_buf or prot->xmit_cnt < 0.\n"); 211 func_exit(); 212 return -EINVAL; /* This is an error which we don't know how to handle. */ 213 } 214 215 rcib = gs_real_chars_in_buffer(port->port.tty); 216 217 if(rcib <= 0) { 218 gs_dprintk (GS_DEBUG_FLUSH, "nothing to wait for.\n"); 219 func_exit(); 220 return rv; 221 } 222 /* stop trying: now + twice the time it would normally take + seconds */ 223 if (timeout == 0) timeout = MAX_SCHEDULE_TIMEOUT; 224 end_jiffies = jiffies; 225 if (timeout != MAX_SCHEDULE_TIMEOUT) 226 end_jiffies += port->baud?(2 * rcib * 10 * HZ / port->baud):0; 227 end_jiffies += timeout; 228 229 gs_dprintk (GS_DEBUG_FLUSH, "now=%lx, end=%lx (%ld).\n", 230 jiffies, end_jiffies, end_jiffies-jiffies); 231 232 /* the expression is actually jiffies < end_jiffies, but that won't 233 work around the wraparound. Tricky eh? */ 234 while ((charsleft = gs_real_chars_in_buffer (port->port.tty)) && 235 time_after (end_jiffies, jiffies)) { 236 /* Units check: 237 chars * (bits/char) * (jiffies /sec) / (bits/sec) = jiffies! 238 check! */ 239 240 charsleft += 16; /* Allow 16 chars more to be transmitted ... */ 241 jiffies_to_transmit = port->baud?(1 + charsleft * 10 * HZ / port->baud):0; 242 /* ^^^ Round up.... */ 243 if (jiffies_to_transmit <= 0) jiffies_to_transmit = 1; 244 245 gs_dprintk (GS_DEBUG_FLUSH, "Expect to finish in %d jiffies " 246 "(%d chars).\n", jiffies_to_transmit, charsleft); 247 248 msleep_interruptible(jiffies_to_msecs(jiffies_to_transmit)); 249 if (signal_pending (current)) { 250 gs_dprintk (GS_DEBUG_FLUSH, "Signal pending. Bombing out: "); 251 rv = -EINTR; 252 break; 253 } 254 } 255 256 gs_dprintk (GS_DEBUG_FLUSH, "charsleft = %d.\n", charsleft); 257 set_current_state (TASK_RUNNING); 258 259 func_exit(); 260 return rv; 261} 262 263 264 265void gs_flush_buffer(struct tty_struct *tty) 266{ 267 struct gs_port *port; 268 unsigned long flags; 269 270 func_enter (); 271 272 port = tty->driver_data; 273 274 if (!port) return; 275 276 /* XXX Would the write semaphore do? */ 277 spin_lock_irqsave (&port->driver_lock, flags); 278 port->xmit_cnt = port->xmit_head = port->xmit_tail = 0; 279 spin_unlock_irqrestore (&port->driver_lock, flags); 280 281 tty_wakeup(tty); 282 func_exit (); 283} 284 285 286void gs_flush_chars(struct tty_struct * tty) 287{ 288 struct gs_port *port; 289 290 func_enter (); 291 292 port = tty->driver_data; 293 294 if (!port) return; 295 296 if (port->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped || 297 !port->xmit_buf) { 298 func_exit (); 299 return; 300 } 301 302 /* Beats me -- REW */ 303 port->port.flags |= GS_TX_INTEN; 304 port->rd->enable_tx_interrupts (port); 305 func_exit (); 306} 307 308 309void gs_stop(struct tty_struct * tty) 310{ 311 struct gs_port *port; 312 313 func_enter (); 314 315 port = tty->driver_data; 316 317 if (!port) return; 318 319 if (port->xmit_cnt && 320 port->xmit_buf && 321 (port->port.flags & GS_TX_INTEN) ) { 322 port->port.flags &= ~GS_TX_INTEN; 323 port->rd->disable_tx_interrupts (port); 324 } 325 func_exit (); 326} 327 328 329void gs_start(struct tty_struct * tty) 330{ 331 struct gs_port *port; 332 333 port = tty->driver_data; 334 335 if (!port) return; 336 337 if (port->xmit_cnt && 338 port->xmit_buf && 339 !(port->port.flags & GS_TX_INTEN) ) { 340 port->port.flags |= GS_TX_INTEN; 341 port->rd->enable_tx_interrupts (port); 342 } 343 func_exit (); 344} 345 346 347static void gs_shutdown_port (struct gs_port *port) 348{ 349 unsigned long flags; 350 351 func_enter(); 352 353 if (!port) return; 354 355 if (!(port->port.flags & ASYNC_INITIALIZED)) 356 return; 357 358 spin_lock_irqsave(&port->driver_lock, flags); 359 360 if (port->xmit_buf) { 361 free_page((unsigned long) port->xmit_buf); 362 port->xmit_buf = NULL; 363 } 364 365 if (port->port.tty) 366 set_bit(TTY_IO_ERROR, &port->port.tty->flags); 367 368 port->rd->shutdown_port (port); 369 370 port->port.flags &= ~ASYNC_INITIALIZED; 371 spin_unlock_irqrestore(&port->driver_lock, flags); 372 373 func_exit(); 374} 375 376 377void gs_hangup(struct tty_struct *tty) 378{ 379 struct gs_port *port; 380 381 func_enter (); 382 383 port = tty->driver_data; 384 tty = port->port.tty; 385 if (!tty) 386 return; 387 388 gs_shutdown_port (port); 389 port->port.flags &= ~(ASYNC_NORMAL_ACTIVE|GS_ACTIVE); 390 port->port.tty = NULL; 391 port->port.count = 0; 392 393 wake_up_interruptible(&port->port.open_wait); 394 func_exit (); 395} 396 397 398int gs_block_til_ready(void *port_, struct file * filp) 399{ 400 struct gs_port *port = port_; 401 DECLARE_WAITQUEUE(wait, current); 402 int retval; 403 int do_clocal = 0; 404 int CD; 405 struct tty_struct *tty; 406 unsigned long flags; 407 408 func_enter (); 409 410 if (!port) return 0; 411 412 tty = port->port.tty; 413 414 gs_dprintk (GS_DEBUG_BTR, "Entering gs_block_till_ready.\n"); 415 /* 416 * If the device is in the middle of being closed, then block 417 * until it's done, and then try again. 418 */ 419 if (tty_hung_up_p(filp) || port->port.flags & ASYNC_CLOSING) { 420 interruptible_sleep_on(&port->port.close_wait); 421 if (port->port.flags & ASYNC_HUP_NOTIFY) 422 return -EAGAIN; 423 else 424 return -ERESTARTSYS; 425 } 426 427 gs_dprintk (GS_DEBUG_BTR, "after hung up\n"); 428 429 /* 430 * If non-blocking mode is set, or the port is not enabled, 431 * then make the check up front and then exit. 432 */ 433 if ((filp->f_flags & O_NONBLOCK) || 434 (tty->flags & (1 << TTY_IO_ERROR))) { 435 port->port.flags |= ASYNC_NORMAL_ACTIVE; 436 return 0; 437 } 438 439 gs_dprintk (GS_DEBUG_BTR, "after nonblock\n"); 440 441 if (C_CLOCAL(tty)) 442 do_clocal = 1; 443 444 /* 445 * Block waiting for the carrier detect and the line to become 446 * free (i.e., not in use by the callout). While we are in 447 * this loop, port->port.count is dropped by one, so that 448 * rs_close() knows when to free things. We restore it upon 449 * exit, either normal or abnormal. 450 */ 451 retval = 0; 452 453 add_wait_queue(&port->port.open_wait, &wait); 454 455 gs_dprintk (GS_DEBUG_BTR, "after add waitq.\n"); 456 spin_lock_irqsave(&port->driver_lock, flags); 457 if (!tty_hung_up_p(filp)) { 458 port->port.count--; 459 } 460 spin_unlock_irqrestore(&port->driver_lock, flags); 461 port->port.blocked_open++; 462 while (1) { 463 CD = port->rd->get_CD (port); 464 gs_dprintk (GS_DEBUG_BTR, "CD is now %d.\n", CD); 465 set_current_state (TASK_INTERRUPTIBLE); 466 if (tty_hung_up_p(filp) || 467 !(port->port.flags & ASYNC_INITIALIZED)) { 468 if (port->port.flags & ASYNC_HUP_NOTIFY) 469 retval = -EAGAIN; 470 else 471 retval = -ERESTARTSYS; 472 break; 473 } 474 if (!(port->port.flags & ASYNC_CLOSING) && 475 (do_clocal || CD)) 476 break; 477 gs_dprintk (GS_DEBUG_BTR, "signal_pending is now: %d (%lx)\n", 478 (int)signal_pending (current), *(long*)(¤t->blocked)); 479 if (signal_pending(current)) { 480 retval = -ERESTARTSYS; 481 break; 482 } 483 schedule(); 484 } 485 gs_dprintk (GS_DEBUG_BTR, "Got out of the loop. (%d)\n", 486 port->port.blocked_open); 487 set_current_state (TASK_RUNNING); 488 remove_wait_queue(&port->port.open_wait, &wait); 489 if (!tty_hung_up_p(filp)) { 490 port->port.count++; 491 } 492 port->port.blocked_open--; 493 if (retval) 494 return retval; 495 496 port->port.flags |= ASYNC_NORMAL_ACTIVE; 497 func_exit (); 498 return 0; 499} 500 501 502void gs_close(struct tty_struct * tty, struct file * filp) 503{ 504 unsigned long flags; 505 struct gs_port *port; 506 507 func_enter (); 508 509 port = (struct gs_port *) tty->driver_data; 510 511 if (!port) return; 512 513 if (!port->port.tty) { 514 /* This seems to happen when this is called from vhangup. */ 515 gs_dprintk (GS_DEBUG_CLOSE, "gs: Odd: port->port.tty is NULL\n"); 516 port->port.tty = tty; 517 } 518 519 spin_lock_irqsave(&port->driver_lock, flags); 520 521 if (tty_hung_up_p(filp)) { 522 spin_unlock_irqrestore(&port->driver_lock, flags); 523 if (port->rd->hungup) 524 port->rd->hungup (port); 525 func_exit (); 526 return; 527 } 528 529 if ((tty->count == 1) && (port->port.count != 1)) { 530 printk(KERN_ERR "gs: gs_close port %p: bad port count;" 531 " tty->count is 1, port count is %d\n", port, port->port.count); 532 port->port.count = 1; 533 } 534 if (--port->port.count < 0) { 535 printk(KERN_ERR "gs: gs_close port %p: bad port count: %d\n", port, port->port.count); 536 port->port.count = 0; 537 } 538 539 if (port->port.count) { 540 gs_dprintk(GS_DEBUG_CLOSE, "gs_close port %p: count: %d\n", port, port->port.count); 541 spin_unlock_irqrestore(&port->driver_lock, flags); 542 func_exit (); 543 return; 544 } 545 port->port.flags |= ASYNC_CLOSING; 546 547 /* 548 * Now we wait for the transmit buffer to clear; and we notify 549 * the line discipline to only process XON/XOFF characters. 550 */ 551 tty->closing = 1; 552 /* if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE) 553 tty_wait_until_sent(tty, port->closing_wait); */ 554 555 /* 556 * At this point we stop accepting input. To do this, we 557 * disable the receive line status interrupts, and tell the 558 * interrupt driver to stop checking the data ready bit in the 559 * line status register. 560 */ 561 562 port->rd->disable_rx_interrupts (port); 563 spin_unlock_irqrestore(&port->driver_lock, flags); 564 565 /* close has no way of returning "EINTR", so discard return value */ 566 if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE) 567 gs_wait_tx_flushed (port, port->closing_wait); 568 569 port->port.flags &= ~GS_ACTIVE; 570 571 gs_flush_buffer(tty); 572 573 tty_ldisc_flush(tty); 574 tty->closing = 0; 575 576 port->event = 0; 577 port->rd->close (port); 578 port->rd->shutdown_port (port); 579 port->port.tty = NULL; 580 581 if (port->port.blocked_open) { 582 if (port->close_delay) { 583 spin_unlock_irqrestore(&port->driver_lock, flags); 584 msleep_interruptible(jiffies_to_msecs(port->close_delay)); 585 spin_lock_irqsave(&port->driver_lock, flags); 586 } 587 wake_up_interruptible(&port->port.open_wait); 588 } 589 port->port.flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING | ASYNC_INITIALIZED); 590 wake_up_interruptible(&port->port.close_wait); 591 592 func_exit (); 593} 594 595 596void gs_set_termios (struct tty_struct * tty, 597 struct ktermios * old_termios) 598{ 599 struct gs_port *port; 600 int baudrate, tmp, rv; 601 struct ktermios *tiosp; 602 603 func_enter(); 604 605 port = tty->driver_data; 606 607 if (!port) return; 608 if (!port->port.tty) { 609 /* This seems to happen when this is called after gs_close. */ 610 gs_dprintk (GS_DEBUG_TERMIOS, "gs: Odd: port->port.tty is NULL\n"); 611 port->port.tty = tty; 612 } 613 614 615 tiosp = tty->termios; 616 617 if (gs_debug & GS_DEBUG_TERMIOS) { 618 gs_dprintk (GS_DEBUG_TERMIOS, "termios structure (%p):\n", tiosp); 619 } 620 621 if(old_termios && (gs_debug & GS_DEBUG_TERMIOS)) { 622 if(tiosp->c_iflag != old_termios->c_iflag) printk("c_iflag changed\n"); 623 if(tiosp->c_oflag != old_termios->c_oflag) printk("c_oflag changed\n"); 624 if(tiosp->c_cflag != old_termios->c_cflag) printk("c_cflag changed\n"); 625 if(tiosp->c_lflag != old_termios->c_lflag) printk("c_lflag changed\n"); 626 if(tiosp->c_line != old_termios->c_line) printk("c_line changed\n"); 627 if(!memcmp(tiosp->c_cc, old_termios->c_cc, NCC)) printk("c_cc changed\n"); 628 } 629 630 baudrate = tty_get_baud_rate(tty); 631 632 if ((tiosp->c_cflag & CBAUD) == B38400) { 633 if ( (port->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI) 634 baudrate = 57600; 635 else if ((port->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI) 636 baudrate = 115200; 637 else if ((port->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI) 638 baudrate = 230400; 639 else if ((port->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP) 640 baudrate = 460800; 641 else if ((port->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) 642 baudrate = (port->baud_base / port->custom_divisor); 643 } 644 645 /* I recommend using THIS instead of the mess in termios (and 646 duplicating the above code). Next we should create a clean 647 interface towards this variable. If your card supports arbitrary 648 baud rates, (e.g. CD1400 or 16550 based cards) then everything 649 will be very easy..... */ 650 port->baud = baudrate; 651 652 /* Two timer ticks seems enough to wakeup something like SLIP driver */ 653 /* Baudrate/10 is cps. Divide by HZ to get chars per tick. */ 654 tmp = (baudrate / 10 / HZ) * 2; 655 656 if (tmp < 0) tmp = 0; 657 if (tmp >= SERIAL_XMIT_SIZE) tmp = SERIAL_XMIT_SIZE-1; 658 659 port->wakeup_chars = tmp; 660 661 /* We should really wait for the characters to be all sent before 662 changing the settings. -- CAL */ 663 rv = gs_wait_tx_flushed (port, MAX_SCHEDULE_TIMEOUT); 664 if (rv < 0) return /* rv */; 665 666 rv = port->rd->set_real_termios(port); 667 if (rv < 0) return /* rv */; 668 669 if ((!old_termios || 670 (old_termios->c_cflag & CRTSCTS)) && 671 !( tiosp->c_cflag & CRTSCTS)) { 672 tty->stopped = 0; 673 gs_start(tty); 674 } 675 676#ifdef tytso_patch_94Nov25_1726 677 /* This "makes sense", Why is it commented out? */ 678 679 if (!(old_termios->c_cflag & CLOCAL) && 680 (tty->termios->c_cflag & CLOCAL)) 681 wake_up_interruptible(&port->gs.open_wait); 682#endif 683 684 func_exit(); 685 return /* 0 */; 686} 687 688 689 690/* Must be called with interrupts enabled */ 691int gs_init_port(struct gs_port *port) 692{ 693 unsigned long flags; 694 695 func_enter (); 696 697 if (port->port.flags & ASYNC_INITIALIZED) { 698 func_exit (); 699 return 0; 700 } 701 if (!port->xmit_buf) { 702 /* We may sleep in get_zeroed_page() */ 703 unsigned long tmp; 704 705 tmp = get_zeroed_page(GFP_KERNEL); 706 spin_lock_irqsave (&port->driver_lock, flags); 707 if (port->xmit_buf) 708 free_page (tmp); 709 else 710 port->xmit_buf = (unsigned char *) tmp; 711 spin_unlock_irqrestore(&port->driver_lock, flags); 712 if (!port->xmit_buf) { 713 func_exit (); 714 return -ENOMEM; 715 } 716 } 717 718 spin_lock_irqsave (&port->driver_lock, flags); 719 if (port->port.tty) 720 clear_bit(TTY_IO_ERROR, &port->port.tty->flags); 721 mutex_init(&port->port_write_mutex); 722 port->xmit_cnt = port->xmit_head = port->xmit_tail = 0; 723 spin_unlock_irqrestore(&port->driver_lock, flags); 724 gs_set_termios(port->port.tty, NULL); 725 spin_lock_irqsave (&port->driver_lock, flags); 726 port->port.flags |= ASYNC_INITIALIZED; 727 port->port.flags &= ~GS_TX_INTEN; 728 729 spin_unlock_irqrestore(&port->driver_lock, flags); 730 func_exit (); 731 return 0; 732} 733 734 735int gs_setserial(struct gs_port *port, struct serial_struct __user *sp) 736{ 737 struct serial_struct sio; 738 739 if (copy_from_user(&sio, sp, sizeof(struct serial_struct))) 740 return(-EFAULT); 741 742 if (!capable(CAP_SYS_ADMIN)) { 743 if ((sio.baud_base != port->baud_base) || 744 (sio.close_delay != port->close_delay) || 745 ((sio.flags & ~ASYNC_USR_MASK) != 746 (port->port.flags & ~ASYNC_USR_MASK))) 747 return(-EPERM); 748 } 749 750 port->port.flags = (port->port.flags & ~ASYNC_USR_MASK) | 751 (sio.flags & ASYNC_USR_MASK); 752 753 port->baud_base = sio.baud_base; 754 port->close_delay = sio.close_delay; 755 port->closing_wait = sio.closing_wait; 756 port->custom_divisor = sio.custom_divisor; 757 758 gs_set_termios (port->port.tty, NULL); 759 760 return 0; 761} 762 763 764/*****************************************************************************/ 765 766/* 767 * Generate the serial struct info. 768 */ 769 770int gs_getserial(struct gs_port *port, struct serial_struct __user *sp) 771{ 772 struct serial_struct sio; 773 774 memset(&sio, 0, sizeof(struct serial_struct)); 775 sio.flags = port->port.flags; 776 sio.baud_base = port->baud_base; 777 sio.close_delay = port->close_delay; 778 sio.closing_wait = port->closing_wait; 779 sio.custom_divisor = port->custom_divisor; 780 sio.hub6 = 0; 781 782 /* If you want you can override these. */ 783 sio.type = PORT_UNKNOWN; 784 sio.xmit_fifo_size = -1; 785 sio.line = -1; 786 sio.port = -1; 787 sio.irq = -1; 788 789 if (port->rd->getserial) 790 port->rd->getserial (port, &sio); 791 792 if (copy_to_user(sp, &sio, sizeof(struct serial_struct))) 793 return -EFAULT; 794 return 0; 795 796} 797 798 799void gs_got_break(struct gs_port *port) 800{ 801 func_enter (); 802 803 tty_insert_flip_char(port->port.tty, 0, TTY_BREAK); 804 tty_schedule_flip(port->port.tty); 805 if (port->port.flags & ASYNC_SAK) { 806 do_SAK (port->port.tty); 807 } 808 809 func_exit (); 810} 811 812 813EXPORT_SYMBOL(gs_put_char); 814EXPORT_SYMBOL(gs_write); 815EXPORT_SYMBOL(gs_write_room); 816EXPORT_SYMBOL(gs_chars_in_buffer); 817EXPORT_SYMBOL(gs_flush_buffer); 818EXPORT_SYMBOL(gs_flush_chars); 819EXPORT_SYMBOL(gs_stop); 820EXPORT_SYMBOL(gs_start); 821EXPORT_SYMBOL(gs_hangup); 822EXPORT_SYMBOL(gs_block_til_ready); 823EXPORT_SYMBOL(gs_close); 824EXPORT_SYMBOL(gs_set_termios); 825EXPORT_SYMBOL(gs_init_port); 826EXPORT_SYMBOL(gs_setserial); 827EXPORT_SYMBOL(gs_getserial); 828EXPORT_SYMBOL(gs_got_break); 829 830MODULE_LICENSE("GPL");