Re: [PATCH v2] i2c: s3c2410: change return type of 'i2c_s3c_irq_nextbyte' from 'int' to 'void'

From: kernel test robot
Date: Fri May 06 2022 - 23:32:52 EST

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In reply to: Krzysztof Kozlowski: "Re: [PATCH v2] i2c: s3c2410: change return type of 'i2c_s3c_irq_nextbyte' from 'int' to 'void'"
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Hi Yihao,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on krzk/for-next]
[also build test ERROR on v5.18-rc5 next-20220506]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url: https://github.com/intel-lab-lkp/linux/commits/Yihao-Han/i2c-s3c2410-change-return-type-of-i2c_s3c_irq_nextbyte-from-int-to-void/20220506-202923
base: https://git.kernel.org/pub/scm/linux/kernel/git/krzk/linux.git for-next
config: arm-randconfig-c002-20220506 (https://download.01.org/0day-ci/archive/20220507/202205071109.36SjNuHG-lkp@xxxxxxxxx/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 5e004fb787698440a387750db7f8028e7cb14cfc)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install arm cross compiling tool for clang build
# apt-get install binutils-arm-linux-gnueabi
# https://github.com/intel-lab-lkp/linux/commit/fdefdf435e27cd445a10a77f475e6d316245ed2b
git remote add linux-review https://github.com/intel-lab-lkp/linux
git fetch --no-tags linux-review Yihao-Han/i2c-s3c2410-change-return-type-of-i2c_s3c_irq_nextbyte-from-int-to-void/20220506-202923
git checkout fdefdf435e27cd445a10a77f475e6d316245ed2b
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash drivers/i2c/busses/

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

All errors (new ones prefixed by >>):

>> drivers/i2c/busses/i2c-s3c2410.c:384:13: error: conflicting types for 'i2c_s3c_irq_nextbyte'
static void i2c_s3c_irq_nextbyte(struct s3c24xx_i2c *i2c, unsigned long iicstat)
^
drivers/i2c/busses/i2c-s3c2410.c:140:12: note: previous declaration is here
static int i2c_s3c_irq_nextbyte(struct s3c24xx_i2c *i2c, unsigned long iicstat);
^
1 error generated.

vim +/i2c_s3c_irq_nextbyte +384 drivers/i2c/busses/i2c-s3c2410.c

380
381 /*
382 * process an interrupt and work out what to do
383 */
> 384 static void i2c_s3c_irq_nextbyte(struct s3c24xx_i2c *i2c, unsigned long iicstat)
385 {
386 unsigned long tmp;
387 unsigned char byte;
388
389 switch (i2c->state) {
390
391 case STATE_IDLE:
392 dev_err(i2c->dev, "%s: called in STATE_IDLE\n", __func__);
393 return;
394
395 case STATE_STOP:
396 dev_err(i2c->dev, "%s: called in STATE_STOP\n", __func__);
397 s3c24xx_i2c_disable_irq(i2c);
398 goto out_ack;
399
400 case STATE_START:
401 /*
402 * last thing we did was send a start condition on the
403 * bus, or started a new i2c message
404 */
405 if (iicstat & S3C2410_IICSTAT_LASTBIT &&
406 !(i2c->msg->flags & I2C_M_IGNORE_NAK)) {
407 /* ack was not received... */
408 dev_dbg(i2c->dev, "ack was not received\n");
409 s3c24xx_i2c_stop(i2c, -ENXIO);
410 goto out_ack;
411 }
412
413 if (i2c->msg->flags & I2C_M_RD)
414 i2c->state = STATE_READ;
415 else
416 i2c->state = STATE_WRITE;
417
418 /*
419 * Terminate the transfer if there is nothing to do
420 * as this is used by the i2c probe to find devices.
421 */
422 if (is_lastmsg(i2c) && i2c->msg->len == 0) {
423 s3c24xx_i2c_stop(i2c, 0);
424 goto out_ack;
425 }
426
427 if (i2c->state == STATE_READ)
428 goto prepare_read;
429
430 /*
431 * fall through to the write state, as we will need to
432 * send a byte as well
433 */
434 fallthrough;
435 case STATE_WRITE:
436 /*
437 * we are writing data to the device... check for the
438 * end of the message, and if so, work out what to do
439 */
440 if (!(i2c->msg->flags & I2C_M_IGNORE_NAK)) {
441 if (iicstat & S3C2410_IICSTAT_LASTBIT) {
442 dev_dbg(i2c->dev, "WRITE: No Ack\n");
443
444 s3c24xx_i2c_stop(i2c, -ECONNREFUSED);
445 goto out_ack;
446 }
447 }
448
449 retry_write:
450
451 if (!is_msgend(i2c)) {
452 byte = i2c->msg->buf[i2c->msg_ptr++];
453 writeb(byte, i2c->regs + S3C2410_IICDS);
454
455 /*
456 * delay after writing the byte to allow the
457 * data setup time on the bus, as writing the
458 * data to the register causes the first bit
459 * to appear on SDA, and SCL will change as
460 * soon as the interrupt is acknowledged
461 */
462 ndelay(i2c->tx_setup);
463
464 } else if (!is_lastmsg(i2c)) {
465 /* we need to go to the next i2c message */
466
467 dev_dbg(i2c->dev, "WRITE: Next Message\n");
468
469 i2c->msg_ptr = 0;
470 i2c->msg_idx++;
471 i2c->msg++;
472
473 /* check to see if we need to do another message */
474 if (i2c->msg->flags & I2C_M_NOSTART) {
475
476 if (i2c->msg->flags & I2C_M_RD) {
477 /*
478 * cannot do this, the controller
479 * forces us to send a new START
480 * when we change direction
481 */
482 dev_dbg(i2c->dev,
483 "missing START before write->read\n");
484 s3c24xx_i2c_stop(i2c, -EINVAL);
485 break;
486 }
487
488 goto retry_write;
489 } else {
490 /* send the new start */
491 s3c24xx_i2c_message_start(i2c, i2c->msg);
492 i2c->state = STATE_START;
493 }
494
495 } else {
496 /* send stop */
497 s3c24xx_i2c_stop(i2c, 0);
498 }
499 break;
500
501 case STATE_READ:
502 /*
503 * we have a byte of data in the data register, do
504 * something with it, and then work out whether we are
505 * going to do any more read/write
506 */
507 byte = readb(i2c->regs + S3C2410_IICDS);
508 i2c->msg->buf[i2c->msg_ptr++] = byte;
509
510 /* Add actual length to read for smbus block read */
511 if (i2c->msg->flags & I2C_M_RECV_LEN && i2c->msg->len == 1)
512 i2c->msg->len += byte;
513 prepare_read:
514 if (is_msglast(i2c)) {
515 /* last byte of buffer */
516
517 if (is_lastmsg(i2c))
518 s3c24xx_i2c_disable_ack(i2c);
519
520 } else if (is_msgend(i2c)) {
521 /*
522 * ok, we've read the entire buffer, see if there
523 * is anything else we need to do
524 */
525 if (is_lastmsg(i2c)) {
526 /* last message, send stop and complete */
527 dev_dbg(i2c->dev, "READ: Send Stop\n");
528
529 s3c24xx_i2c_stop(i2c, 0);
530 } else {
531 /* go to the next transfer */
532 dev_dbg(i2c->dev, "READ: Next Transfer\n");
533
534 i2c->msg_ptr = 0;
535 i2c->msg_idx++;
536 i2c->msg++;
537 }
538 }
539
540 break;
541 }
542
543 /* acknowlegde the IRQ and get back on with the work */
544
545 out_ack:
546 tmp = readl(i2c->regs + S3C2410_IICCON);
547 tmp &= ~S3C2410_IICCON_IRQPEND;
548 writel(tmp, i2c->regs + S3C2410_IICCON);
549 }
550

--
0-DAY CI Kernel Test Service
https://01.org/lkp

Next message: Chao Yu: "Re: [f2fs-dev] [PATCH 4/5] f2fs: do not stop GC when requiring a free section"
Previous message: Baoquan He: "Re: [PATCH v24 6/6] docs: kdump: Update the crashkernel description for arm64"
In reply to: Krzysztof Kozlowski: "Re: [PATCH v2] i2c: s3c2410: change return type of 'i2c_s3c_irq_nextbyte' from 'int' to 'void'"
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