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regmap: Quit the read-loop based on position of file-offset

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Some implementation's of the 'cat' command pass the
absolute position of the file-offset. In the current
implementation of 'regmap_data_read_file' this leads
to dumping all the registers from offset 0.

Avoid this by quitting the read loop if the file-offset
requested is lower than actual read-offset.

Change-Id: I7c6c31958e92f16387bf4cb5de7fbf4572fcce21
Signed-off-by: Anirudh Ghayal <aghayal@codeaurora.org>
This commit is contained in:
Anirudh Ghayal 2019-11-13 08:50:04 +05:30 • committed by Gerrit - the friendly Code Review server
commit 40e7dc2fd6
1 changed files with 3 additions and 0 deletions
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3
drivers/base/regmap/regmap-debugfs.c
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@ -355,6 +355,9 @@ static ssize_t regmap_data_read_file(struct file *file, char __user *user_buf,
else if (*ppos >= map->dump_address * map->debugfs_tot_len
+ map->dump_count * map->debugfs_tot_len)
return 0;
else if (*ppos < map->dump_address * map->debugfs_tot_len)
return 0;
return regmap_read_debugfs(map, 0, map->max_register, user_buf,
new_count, ppos);
}