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regmap: Fix for v6.10

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The I2C bus was not taking account of the register and any padding bytes
 when handling maximum write sizes supported by an I2C adaptor, this
 patch from Jim Wylder fixes that.
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Merge tag 'regmap-fix-v6.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap

Pull regmap fix from Mark Brown:
 "The I2C bus was not taking account of the register and any padding
  bytes when handling maximum write sizes supported by an I2C adaptor,
  this patch from Jim Wylder fixes that"

* tag 'regmap-fix-v6.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap:
  regmap-i2c: Subtract reg size from max_write
This commit is contained in:
Linus Torvalds 2024-05-31 16:09:27 -07:00
commit b7c05622da
1 changed files with 2 additions and 1 deletions
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3
drivers/base/regmap/regmap-i2c.c
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@ -350,7 +350,8 @@ static const struct regmap_bus *regmap_get_i2c_bus(struct i2c_client *i2c,
if (quirks->max_write_len &&
(bus->max_raw_write == 0 || bus->max_raw_write > quirks->max_write_len))
max_write = quirks->max_write_len;
max_write = quirks->max_write_len -
(config->reg_bits + config->pad_bits) / BITS_PER_BYTE;
if (max_read || max_write) {
ret_bus = kmemdup(bus, sizeof(*bus), GFP_KERNEL);