drivers/bus/sunxi-rsb.c:286 _sunxi_rsb_run_xfer() warn: assigning (-110) to unsigned variable 'timeout'
From: Dan Carpenter
Date: Thu May 04 2023 - 06:05:42 EST
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 1a5304fecee523060f26e2778d9d8e33c0562df3
commit: 077686da0e2162c4ea5ae0df205849c2a7a84479 bus: sunxi-rsb: Support atomic transfers
config: arm64-randconfig-m041-20230428 (https://download.01.org/0day-ci/archive/20230504/202305041714.yy6fC4eJ-lkp@xxxxxxxxx/config)
compiler: aarch64-linux-gcc (GCC) 12.1.0
If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Reported-by: Dan Carpenter <error27@xxxxxxxxx>
| Link: https://lore.kernel.org/r/202305041714.yy6fC4eJ-lkp@xxxxxxxxx/
smatch warnings:
drivers/bus/sunxi-rsb.c:286 _sunxi_rsb_run_xfer() warn: assigning (-110) to unsigned variable 'timeout'
vim +/timeout +286 drivers/bus/sunxi-rsb.c
d787dcdb9c8f41 Chen-Yu Tsai 2015-10-23 268 static int _sunxi_rsb_run_xfer(struct sunxi_rsb *rsb)
d787dcdb9c8f41 Chen-Yu Tsai 2015-10-23 269 {
077686da0e2162 Samuel Holland 2022-11-13 270 u32 int_mask, status;
077686da0e2162 Samuel Holland 2022-11-13 271 bool timeout;
077686da0e2162 Samuel Holland 2022-11-13 272
d787dcdb9c8f41 Chen-Yu Tsai 2015-10-23 273 if (readl(rsb->regs + RSB_CTRL) & RSB_CTRL_START_TRANS) {
d787dcdb9c8f41 Chen-Yu Tsai 2015-10-23 274 dev_dbg(rsb->dev, "RSB transfer still in progress\n");
d787dcdb9c8f41 Chen-Yu Tsai 2015-10-23 275 return -EBUSY;
d787dcdb9c8f41 Chen-Yu Tsai 2015-10-23 276 }
d787dcdb9c8f41 Chen-Yu Tsai 2015-10-23 277
d787dcdb9c8f41 Chen-Yu Tsai 2015-10-23 278 reinit_completion(&rsb->complete);
d787dcdb9c8f41 Chen-Yu Tsai 2015-10-23 279
077686da0e2162 Samuel Holland 2022-11-13 280 int_mask = RSB_INTS_LOAD_BSY | RSB_INTS_TRANS_ERR | RSB_INTS_TRANS_OVER;
077686da0e2162 Samuel Holland 2022-11-13 281 writel(int_mask, rsb->regs + RSB_INTE);
d787dcdb9c8f41 Chen-Yu Tsai 2015-10-23 282 writel(RSB_CTRL_START_TRANS | RSB_CTRL_GLOBAL_INT_ENB,
d787dcdb9c8f41 Chen-Yu Tsai 2015-10-23 283 rsb->regs + RSB_CTRL);
d787dcdb9c8f41 Chen-Yu Tsai 2015-10-23 284
077686da0e2162 Samuel Holland 2022-11-13 285 if (irqs_disabled()) {
077686da0e2162 Samuel Holland 2022-11-13 @286 timeout = readl_poll_timeout_atomic(rsb->regs + RSB_INTS,
077686da0e2162 Samuel Holland 2022-11-13 287 status, (status & int_mask),
077686da0e2162 Samuel Holland 2022-11-13 288 10, 100000);
This works, but Smatch doesn't like it when people save negatives to
a bool.
077686da0e2162 Samuel Holland 2022-11-13 289 writel(status, rsb->regs + RSB_INTS);
077686da0e2162 Samuel Holland 2022-11-13 290 } else {
077686da0e2162 Samuel Holland 2022-11-13 291 timeout = !wait_for_completion_io_timeout(&rsb->complete,
077686da0e2162 Samuel Holland 2022-11-13 292 msecs_to_jiffies(100));
077686da0e2162 Samuel Holland 2022-11-13 293 status = rsb->status;
077686da0e2162 Samuel Holland 2022-11-13 294 }
077686da0e2162 Samuel Holland 2022-11-13 295
077686da0e2162 Samuel Holland 2022-11-13 296 if (timeout) {
d787dcdb9c8f41 Chen-Yu Tsai 2015-10-23 297 dev_dbg(rsb->dev, "RSB timeout\n");
d787dcdb9c8f41 Chen-Yu Tsai 2015-10-23 298
d787dcdb9c8f41 Chen-Yu Tsai 2015-10-23 299 /* abort the transfer */
d787dcdb9c8f41 Chen-Yu Tsai 2015-10-23 300 writel(RSB_CTRL_ABORT_TRANS, rsb->regs + RSB_CTRL);
d787dcdb9c8f41 Chen-Yu Tsai 2015-10-23 301
d787dcdb9c8f41 Chen-Yu Tsai 2015-10-23 302 /* clear any interrupt flags */
d787dcdb9c8f41 Chen-Yu Tsai 2015-10-23 303 writel(readl(rsb->regs + RSB_INTS), rsb->regs + RSB_INTS);
d787dcdb9c8f41 Chen-Yu Tsai 2015-10-23 304
d787dcdb9c8f41 Chen-Yu Tsai 2015-10-23 305 return -ETIMEDOUT;
d787dcdb9c8f41 Chen-Yu Tsai 2015-10-23 306 }
d787dcdb9c8f41 Chen-Yu Tsai 2015-10-23 307
077686da0e2162 Samuel Holland 2022-11-13 308 if (status & RSB_INTS_LOAD_BSY) {
d787dcdb9c8f41 Chen-Yu Tsai 2015-10-23 309 dev_dbg(rsb->dev, "RSB busy\n");
d787dcdb9c8f41 Chen-Yu Tsai 2015-10-23 310 return -EBUSY;
d787dcdb9c8f41 Chen-Yu Tsai 2015-10-23 311 }
d787dcdb9c8f41 Chen-Yu Tsai 2015-10-23 312
077686da0e2162 Samuel Holland 2022-11-13 313 if (status & RSB_INTS_TRANS_ERR) {
077686da0e2162 Samuel Holland 2022-11-13 314 if (status & RSB_INTS_TRANS_ERR_ACK) {
d787dcdb9c8f41 Chen-Yu Tsai 2015-10-23 315 dev_dbg(rsb->dev, "RSB slave nack\n");
d787dcdb9c8f41 Chen-Yu Tsai 2015-10-23 316 return -EINVAL;
d787dcdb9c8f41 Chen-Yu Tsai 2015-10-23 317 }
d787dcdb9c8f41 Chen-Yu Tsai 2015-10-23 318
077686da0e2162 Samuel Holland 2022-11-13 319 if (status & RSB_INTS_TRANS_ERR_DATA) {
d787dcdb9c8f41 Chen-Yu Tsai 2015-10-23 320 dev_dbg(rsb->dev, "RSB transfer data error\n");
d787dcdb9c8f41 Chen-Yu Tsai 2015-10-23 321 return -EIO;
d787dcdb9c8f41 Chen-Yu Tsai 2015-10-23 322 }
d787dcdb9c8f41 Chen-Yu Tsai 2015-10-23 323 }
d787dcdb9c8f41 Chen-Yu Tsai 2015-10-23 324
d787dcdb9c8f41 Chen-Yu Tsai 2015-10-23 325 return 0;
d787dcdb9c8f41 Chen-Yu Tsai 2015-10-23 326 }
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests