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regmap: Fix for v6.4 

A fix for a long standing issue where when we create a new node in an
 rbtree register cache we were failing to convert the register address
 of the new register into a bitmask correctly and marking the wrong
 register as being present in the newly created node.  This would only
 have affected devices with a register stride other than 1 but would
 corrupt data on those devices.
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Merge tag 'regmap-fix-v6.6-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap

Pull regmap fix from Mark Brown:
 "A fix for a long standing issue where when we create a new node in an
  rbtree register cache we were failing to convert the register address
  of the new register into a bitmask correctly and marking the wrong
  register as being present in the newly created node.

  This would only have affected devices with a register stride other
  than 1 but would corrupt data on those devices"

* tag 'regmap-fix-v6.6-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap:
  regmap: rbtree: Fix wrong register marked as in-cache when creating new node
This commit is contained in:
Linus Torvalds 2023-10-03 11:57:37 -07:00
parent 5e62ed3b1c 7a795ac8d4
commit cdcb5d194f
1 changed files with 2 additions and 1 deletions
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3
drivers/base/regmap/regcache-rbtree.c
View File

@ -453,7 +453,8 @@ static int regcache_rbtree_write(struct regmap *map, unsigned int reg,
if (!rbnode)
return -ENOMEM;
regcache_rbtree_set_register(map, rbnode,
reg - rbnode->base_reg, value);
(reg - rbnode->base_reg) / map->reg_stride,
value);
regcache_rbtree_insert(map, &rbtree_ctx->root, rbnode);
rbtree_ctx->cached_rbnode = rbnode;
}