Re: [PATCH v3] serial: samsung: use dma_ops of DMA if attached

From: Dan Carpenter
Date: Mon Jun 28 2021 - 04:40:42 EST

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Hi Tamseel,

url: https://github.com/0day-ci/linux/commits/Tamseel-Shams/serial-samsung-use-dma_ops-of-DMA-if-attached/20210622-195936
base: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git tty-testing
config: parisc-randconfig-m031-20210625 (attached as .config)
compiler: hppa-linux-gcc (GCC) 9.3.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

New smatch warnings:
drivers/tty/serial/samsung_tty.c:347 s3c24xx_serial_tx_dma_complete() error: we previously assumed 'dma' could be null (see line 344)
drivers/tty/serial/samsung_tty.c:347 s3c24xx_serial_tx_dma_complete() error: we previously assumed 'dma->tx_chan' could be null (see line 344)
drivers/tty/serial/samsung_tty.c:458 s3c24xx_serial_start_tx_dma() error: we previously assumed 'dma' could be null (see line 452)
drivers/tty/serial/samsung_tty.c:538 s3c24xx_uart_copy_rx_to_tty() error: we previously assumed 'dma' could be null (see line 532)
drivers/tty/serial/samsung_tty.c:664 s3c64xx_start_rx_dma() error: we previously assumed 'dma' could be null (see line 661)
drivers/tty/serial/samsung_tty.c:1132 s3c24xx_serial_request_dma() warn: variable dereferenced before check 'dma' (see line 1077)

Old smatch warnings:
drivers/tty/serial/samsung_tty.c:2129 s3c24xx_serial_init_port() warn: missing error code 'ret'

vim +/dma +347 drivers/tty/serial/samsung_tty.c

29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 332 static void s3c24xx_serial_tx_dma_complete(void *args)
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 333 {
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 334 struct s3c24xx_uart_port *ourport = args;
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 335 struct uart_port *port = &ourport->port;
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 336 struct circ_buf *xmit = &port->state->xmit;
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 337 struct s3c24xx_uart_dma *dma = ourport->dma;
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 338 struct dma_tx_state state;
36f392dcc64c96 drivers/tty/serial/samsung_tty.c Tamseel Shams 2021-06-22 339 struct device *dma_map_ops_dev = ourport->port.dev;
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 340 unsigned long flags;
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 341 int count;
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 342
36f392dcc64c96 drivers/tty/serial/samsung_tty.c Tamseel Shams 2021-06-22 343 /* Null pointer check for "dma" and "dma->tx_chan" */
36f392dcc64c96 drivers/tty/serial/samsung_tty.c Tamseel Shams 2021-06-22 @344 if (dma && dma->tx_chan)
^^^
Check for NULL

36f392dcc64c96 drivers/tty/serial/samsung_tty.c Tamseel Shams 2021-06-22 345 dma_map_ops_dev = dma->tx_chan->device->dev;
36f392dcc64c96 drivers/tty/serial/samsung_tty.c Tamseel Shams 2021-06-22 346
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 @347 dmaengine_tx_status(dma->tx_chan, dma->tx_cookie, &state);
^^^^^^^^^^^^
Unchecked dereference

29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 348 count = dma->tx_bytes_requested - state.residue;
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 349 async_tx_ack(dma->tx_desc);
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 350
36f392dcc64c96 drivers/tty/serial/samsung_tty.c Tamseel Shams 2021-06-22 351 dma_sync_single_for_cpu(dma_map_ops_dev, dma->tx_transfer_addr,
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 352 dma->tx_size, DMA_TO_DEVICE);
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 353
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 354 spin_lock_irqsave(&port->lock, flags);
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 355
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 356 xmit->tail = (xmit->tail + count) & (UART_XMIT_SIZE - 1);
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 357 port->icount.tx += count;
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 358 ourport->tx_in_progress = 0;
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 359
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 360 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 361 uart_write_wakeup(port);
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 362
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 363 s3c24xx_serial_start_next_tx(ourport);
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 364 spin_unlock_irqrestore(&port->lock, flags);
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 365 }
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 366
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 367 static void enable_tx_dma(struct s3c24xx_uart_port *ourport)
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 368 {
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 369 struct uart_port *port = &ourport->port;
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 370 u32 ucon;
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 371
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 372 /* Mask Tx interrupt */
aaf144059ba474 drivers/tty/serial/samsung_tty.c Hector Martin 2021-03-05 373 switch (ourport->info->type) {
aaf144059ba474 drivers/tty/serial/samsung_tty.c Hector Martin 2021-03-05 374 case TYPE_S3C6400:
bbb5ff91225dfb drivers/tty/serial/samsung.c Matthew Leach 2016-06-22 375 s3c24xx_set_bit(port, S3C64XX_UINTM_TXD, S3C64XX_UINTM);
aaf144059ba474 drivers/tty/serial/samsung_tty.c Hector Martin 2021-03-05 376 break;
fcbba344907afe drivers/tty/serial/samsung_tty.c Hector Martin 2021-03-05 377 case TYPE_APPLE_S5L:
fcbba344907afe drivers/tty/serial/samsung_tty.c Hector Martin 2021-03-05 378 WARN_ON(1); // No DMA
fcbba344907afe drivers/tty/serial/samsung_tty.c Hector Martin 2021-03-05 379 break;
aaf144059ba474 drivers/tty/serial/samsung_tty.c Hector Martin 2021-03-05 380 default:
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 381 disable_irq_nosync(ourport->tx_irq);
aaf144059ba474 drivers/tty/serial/samsung_tty.c Hector Martin 2021-03-05 382 break;
aaf144059ba474 drivers/tty/serial/samsung_tty.c Hector Martin 2021-03-05 383 }
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 384
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 385 /* Enable tx dma mode */
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 386 ucon = rd_regl(port, S3C2410_UCON);
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 387 ucon &= ~(S3C64XX_UCON_TXBURST_MASK | S3C64XX_UCON_TXMODE_MASK);
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 388 ucon |= (dma_get_cache_alignment() >= 16) ?
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 389 S3C64XX_UCON_TXBURST_16 : S3C64XX_UCON_TXBURST_1;
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 390 ucon |= S3C64XX_UCON_TXMODE_DMA;
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 391 wr_regl(port, S3C2410_UCON, ucon);
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 392
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 393 ourport->tx_mode = S3C24XX_TX_DMA;
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 394 }
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 395
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 396 static void enable_tx_pio(struct s3c24xx_uart_port *ourport)
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 397 {
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 398 struct uart_port *port = &ourport->port;
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 399 u32 ucon, ufcon;
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 400
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 401 /* Set ufcon txtrig */
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 402 ourport->tx_in_progress = S3C24XX_TX_PIO;
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 403 ufcon = rd_regl(port, S3C2410_UFCON);
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 404 wr_regl(port, S3C2410_UFCON, ufcon);
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 405
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 406 /* Enable tx pio mode */
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 407 ucon = rd_regl(port, S3C2410_UCON);
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 408 ucon &= ~(S3C64XX_UCON_TXMODE_MASK);
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 409 ucon |= S3C64XX_UCON_TXMODE_CPU;
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 410 wr_regl(port, S3C2410_UCON, ucon);
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 411
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 412 /* Unmask Tx interrupt */
aaf144059ba474 drivers/tty/serial/samsung_tty.c Hector Martin 2021-03-05 413 switch (ourport->info->type) {
aaf144059ba474 drivers/tty/serial/samsung_tty.c Hector Martin 2021-03-05 414 case TYPE_S3C6400:
bbb5ff91225dfb drivers/tty/serial/samsung.c Matthew Leach 2016-06-22 415 s3c24xx_clear_bit(port, S3C64XX_UINTM_TXD,
bbb5ff91225dfb drivers/tty/serial/samsung.c Matthew Leach 2016-06-22 416 S3C64XX_UINTM);
aaf144059ba474 drivers/tty/serial/samsung_tty.c Hector Martin 2021-03-05 417 break;
fcbba344907afe drivers/tty/serial/samsung_tty.c Hector Martin 2021-03-05 418 case TYPE_APPLE_S5L:
fcbba344907afe drivers/tty/serial/samsung_tty.c Hector Martin 2021-03-05 419 ucon |= APPLE_S5L_UCON_TXTHRESH_ENA_MSK;
fcbba344907afe drivers/tty/serial/samsung_tty.c Hector Martin 2021-03-05 420 wr_regl(port, S3C2410_UCON, ucon);
fcbba344907afe drivers/tty/serial/samsung_tty.c Hector Martin 2021-03-05 421 break;
aaf144059ba474 drivers/tty/serial/samsung_tty.c Hector Martin 2021-03-05 422 default:
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 423 enable_irq(ourport->tx_irq);
aaf144059ba474 drivers/tty/serial/samsung_tty.c Hector Martin 2021-03-05 424 break;
aaf144059ba474 drivers/tty/serial/samsung_tty.c Hector Martin 2021-03-05 425 }
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 426
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 427 ourport->tx_mode = S3C24XX_TX_PIO;
fcbba344907afe drivers/tty/serial/samsung_tty.c Hector Martin 2021-03-05 428
fcbba344907afe drivers/tty/serial/samsung_tty.c Hector Martin 2021-03-05 429 /*
fcbba344907afe drivers/tty/serial/samsung_tty.c Hector Martin 2021-03-05 430 * The Apple version only has edge triggered TX IRQs, so we need
fcbba344907afe drivers/tty/serial/samsung_tty.c Hector Martin 2021-03-05 431 * to kick off the process by sending some characters here.
fcbba344907afe drivers/tty/serial/samsung_tty.c Hector Martin 2021-03-05 432 */
fcbba344907afe drivers/tty/serial/samsung_tty.c Hector Martin 2021-03-05 433 if (ourport->info->type == TYPE_APPLE_S5L)
fcbba344907afe drivers/tty/serial/samsung_tty.c Hector Martin 2021-03-05 434 s3c24xx_serial_tx_chars(ourport);
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 435 }
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 436
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 437 static void s3c24xx_serial_start_tx_pio(struct s3c24xx_uart_port *ourport)
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 438 {
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 439 if (ourport->tx_mode != S3C24XX_TX_PIO)
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 440 enable_tx_pio(ourport);
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 441 }
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 442
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 443 static int s3c24xx_serial_start_tx_dma(struct s3c24xx_uart_port *ourport,
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 444 unsigned int count)
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 445 {
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 446 struct uart_port *port = &ourport->port;
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 447 struct circ_buf *xmit = &port->state->xmit;
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 448 struct s3c24xx_uart_dma *dma = ourport->dma;
36f392dcc64c96 drivers/tty/serial/samsung_tty.c Tamseel Shams 2021-06-22 449 struct device *dma_map_ops_dev = ourport->port.dev;
36f392dcc64c96 drivers/tty/serial/samsung_tty.c Tamseel Shams 2021-06-22 450
36f392dcc64c96 drivers/tty/serial/samsung_tty.c Tamseel Shams 2021-06-22 451 /* Null pointer check for "dma" and "dma->tx_chan" */
36f392dcc64c96 drivers/tty/serial/samsung_tty.c Tamseel Shams 2021-06-22 @452 if (dma && dma->tx_chan)
36f392dcc64c96 drivers/tty/serial/samsung_tty.c Tamseel Shams 2021-06-22 453 dma_map_ops_dev = dma->tx_chan->device->dev;
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 454
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 455 if (ourport->tx_mode != S3C24XX_TX_DMA)
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 456 enable_tx_dma(ourport);
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 457
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 @458 dma->tx_size = count & ~(dma_get_cache_alignment() - 1);
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 459 dma->tx_transfer_addr = dma->tx_addr + xmit->tail;
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 460
36f392dcc64c96 drivers/tty/serial/samsung_tty.c Tamseel Shams 2021-06-22 461 dma_sync_single_for_device(dma_map_ops_dev, dma->tx_transfer_addr,
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 462 dma->tx_size, DMA_TO_DEVICE);
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 463
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 464 dma->tx_desc = dmaengine_prep_slave_single(dma->tx_chan,
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 465 dma->tx_transfer_addr, dma->tx_size,
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 466 DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT);
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 467 if (!dma->tx_desc) {
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 468 dev_err(ourport->port.dev, "Unable to get desc for Tx\n");
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 469 return -EIO;
b497549a035c2a drivers/serial/samsung.c Ben Dooks 2008-07-03 470 }
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 471
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 472 dma->tx_desc->callback = s3c24xx_serial_tx_dma_complete;
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 473 dma->tx_desc->callback_param = ourport;
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 474 dma->tx_bytes_requested = dma->tx_size;
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 475
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 476 ourport->tx_in_progress = S3C24XX_TX_DMA;
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 477 dma->tx_cookie = dmaengine_submit(dma->tx_desc);
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 478 dma_async_issue_pending(dma->tx_chan);
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 479 return 0;
b497549a035c2a drivers/serial/samsung.c Ben Dooks 2008-07-03 480 }
b497549a035c2a drivers/serial/samsung.c Ben Dooks 2008-07-03 481
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 482 static void s3c24xx_serial_start_next_tx(struct s3c24xx_uart_port *ourport)
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 483 {
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 484 struct uart_port *port = &ourport->port;
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 485 struct circ_buf *xmit = &port->state->xmit;
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 486 unsigned long count;
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 487
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 488 /* Get data size up to the end of buffer */
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 489 count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 490
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 491 if (!count) {
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 492 s3c24xx_serial_stop_tx(port);
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 493 return;
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 494 }
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 495
81ccb2a69f76b8 drivers/tty/serial/samsung.c Marek Szyprowski 2015-07-31 496 if (!ourport->dma || !ourport->dma->tx_chan ||
736cd79f483fd7 drivers/tty/serial/samsung.c Robert Baldyga 2015-07-31 497 count < ourport->min_dma_size ||
736cd79f483fd7 drivers/tty/serial/samsung.c Robert Baldyga 2015-07-31 498 xmit->tail & (dma_get_cache_alignment() - 1))
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 499 s3c24xx_serial_start_tx_pio(ourport);
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 500 else
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 501 s3c24xx_serial_start_tx_dma(ourport, count);
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 502 }
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 503
75781979f8d33e drivers/tty/serial/samsung.c Krzysztof Kozlowski 2015-05-02 504 static void s3c24xx_serial_start_tx(struct uart_port *port)
b497549a035c2a drivers/serial/samsung.c Ben Dooks 2008-07-03 505 {
b73c289cc90138 drivers/serial/samsung.c Ben Dooks 2008-10-21 506 struct s3c24xx_uart_port *ourport = to_ourport(port);
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 507 struct circ_buf *xmit = &port->state->xmit;
b73c289cc90138 drivers/serial/samsung.c Ben Dooks 2008-10-21 508
8336240ebb248b drivers/tty/serial/samsung_tty.c Greg Kroah-Hartman 2019-12-17 509 if (!ourport->tx_enabled) {
b497549a035c2a drivers/serial/samsung.c Ben Dooks 2008-07-03 510 if (port->flags & UPF_CONS_FLOW)
b497549a035c2a drivers/serial/samsung.c Ben Dooks 2008-07-03 511 s3c24xx_serial_rx_disable(port);
b497549a035c2a drivers/serial/samsung.c Ben Dooks 2008-07-03 512
8336240ebb248b drivers/tty/serial/samsung_tty.c Greg Kroah-Hartman 2019-12-17 513 ourport->tx_enabled = 1;
ba019a3e2ad53d drivers/tty/serial/samsung.c Robert Baldyga 2015-01-28 514 if (!ourport->dma || !ourport->dma->tx_chan)
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 515 s3c24xx_serial_start_tx_pio(ourport);
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 516 }
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 517
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 518 if (ourport->dma && ourport->dma->tx_chan) {
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 519 if (!uart_circ_empty(xmit) && !ourport->tx_in_progress)
29bef79908459d drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 520 s3c24xx_serial_start_next_tx(ourport);
b497549a035c2a drivers/serial/samsung.c Ben Dooks 2008-07-03 521 }
b497549a035c2a drivers/serial/samsung.c Ben Dooks 2008-07-03 522 }
b497549a035c2a drivers/serial/samsung.c Ben Dooks 2008-07-03 523
b543c301c2c5fb drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 524 static void s3c24xx_uart_copy_rx_to_tty(struct s3c24xx_uart_port *ourport,
b543c301c2c5fb drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 525 struct tty_port *tty, int count)
b543c301c2c5fb drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 526 {
b543c301c2c5fb drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 527 struct s3c24xx_uart_dma *dma = ourport->dma;
36f392dcc64c96 drivers/tty/serial/samsung_tty.c Tamseel Shams 2021-06-22 528 struct device *dma_map_ops_dev = ourport->port.dev;
b543c301c2c5fb drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 529 int copied;
b543c301c2c5fb drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 530
36f392dcc64c96 drivers/tty/serial/samsung_tty.c Tamseel Shams 2021-06-22 531 /* Null pointer check for "dma" and "dma->rx_chan" */
36f392dcc64c96 drivers/tty/serial/samsung_tty.c Tamseel Shams 2021-06-22 @532 if (dma && dma->rx_chan)
36f392dcc64c96 drivers/tty/serial/samsung_tty.c Tamseel Shams 2021-06-22 533 dma_map_ops_dev = dma->rx_chan->device->dev;
36f392dcc64c96 drivers/tty/serial/samsung_tty.c Tamseel Shams 2021-06-22 534
b543c301c2c5fb drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 535 if (!count)
b543c301c2c5fb drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 536 return;
b543c301c2c5fb drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 537
36f392dcc64c96 drivers/tty/serial/samsung_tty.c Tamseel Shams 2021-06-22 @538 dma_sync_single_for_cpu(dma_map_ops_dev, dma->rx_addr,
b543c301c2c5fb drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 539 dma->rx_size, DMA_FROM_DEVICE);
b543c301c2c5fb drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 540
b543c301c2c5fb drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 541 ourport->port.icount.rx += count;
b543c301c2c5fb drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 542 if (!tty) {
b543c301c2c5fb drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 543 dev_err(ourport->port.dev, "No tty port\n");
b543c301c2c5fb drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 544 return;
b543c301c2c5fb drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 545 }
b543c301c2c5fb drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 546 copied = tty_insert_flip_string(tty,
b543c301c2c5fb drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 547 ((unsigned char *)(ourport->dma->rx_buf)), count);
b543c301c2c5fb drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 548 if (copied != count) {
b543c301c2c5fb drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 549 WARN_ON(1);
b543c301c2c5fb drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 550 dev_err(ourport->port.dev, "RxData copy to tty layer failed\n");
b543c301c2c5fb drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 551 }
b543c301c2c5fb drivers/tty/serial/samsung.c Robert Baldyga 2014-12-10 552 }

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