Hello Nick Dyer,
The patch e57a66aa8534: "Input: atmel_mxt_ts - read and report
bootloader version" from May 18, 2014, leads to the following static
checker warning:
drivers/input/touchscreen/atmel_mxt_ts.c:437 mxt_get_bootloader_version()
warn: signedness bug returning '(-5)'
drivers/input/touchscreen/atmel_mxt_ts.c
429 static u8 mxt_get_bootloader_version(struct mxt_data *data, u8 val)
430 {
431 struct device *dev = &data->client->dev;
432 u8 buf[3];
433
434 if (val & MXT_BOOT_EXTENDED_ID) {
435 if (mxt_bootloader_read(data, &buf[0], 3) != 0) {
436 dev_err(dev, "%s: i2c failure\n", __func__);
437 return -EIO;
^^^^
This gets truncated into a number from 0-255 and anyway the caller
doesn't check for errors.
438 }
439
440 dev_dbg(dev, "Bootloader ID:%d Version:%d\n", buf[1], buf[2]);
441
442 return buf[0];
443 } else {
444 dev_dbg(dev, "Bootloader ID:%d\n", val & MXT_BOOT_ID_MASK);
445
446 return val;
447 }
448 }
regards,
dan carpenter
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