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Revert "ethtool: Fix mod state of verbose no_mask bitset" 

This reverts commit 108a36d07c.

It was reported that this fix breaks the possibility to remove existing WoL
flags. For example:
~$ ethtool lan2
...
        Supports Wake-on: pg
        Wake-on: d
...
~$ ethtool -s lan2 wol gp
~$ ethtool lan2
...
        Wake-on: pg
...
~$ ethtool -s lan2 wol d
~$ ethtool lan2
...
        Wake-on: pg
...

This worked correctly before this commit because we were always updating
a zero bitmap (since commit 6699170376 ("ethtool: fix application of
verbose no_mask bitset"), that is) so that the rest was left zero
naturally. But now the 1->0 change (old_val is true, bit not present in
netlink nest) no longer works.

Reported-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reported-by: Michal Kubecek <mkubecek@suse.cz>
Closes: https://lore.kernel.org/netdev/20231019095140.l6fffnszraeb6iiw@lion.mk-sys.cz/
Cc: stable@vger.kernel.org
Fixes: 108a36d07c ("ethtool: Fix mod state of verbose no_mask bitset")
Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
Reviewed-by: Michal Kubecek <mkubecek@suse.cz>
Link: https://lore.kernel.org/r/20231019-feature_ptp_bitset_fix-v1-1-70f3c429a221@bootlin.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Kory Maincent 2023-10-19 15:16:41 +02:00 committed by Jakub Kicinski
parent 1c1f14f92b
commit 524515020f
1 changed files with 6 additions and 26 deletions
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32
net/ethtool/bitset.c
View File

@ -431,10 +431,8 @@ ethnl_update_bitset32_verbose(u32 *bitmap, unsigned int nbits,
ethnl_string_array_t names,
struct netlink_ext_ack *extack, bool *mod)
{
u32 *orig_bitmap, *saved_bitmap = NULL;
struct nlattr *bit_attr;
bool no_mask;
bool dummy;
int rem;
int ret;
@ -450,22 +448,8 @@ ethnl_update_bitset32_verbose(u32 *bitmap, unsigned int nbits,
}
no_mask = tb[ETHTOOL_A_BITSET_NOMASK];
if (no_mask) {
unsigned int nwords = DIV_ROUND_UP(nbits, 32);
unsigned int nbytes = nwords * sizeof(u32);
/* The bitmap size is only the size of the map part without
* its mask part.
*/
saved_bitmap = kcalloc(nwords, sizeof(u32), GFP_KERNEL);
if (!saved_bitmap)
return -ENOMEM;
memcpy(saved_bitmap, bitmap, nbytes);
ethnl_bitmap32_clear(bitmap, 0, nbits, &dummy);
orig_bitmap = saved_bitmap;
} else {
orig_bitmap = bitmap;
}
if (no_mask)
ethnl_bitmap32_clear(bitmap, 0, nbits, mod);
nla_for_each_nested(bit_attr, tb[ETHTOOL_A_BITSET_BITS], rem) {
bool old_val, new_val;
@ -474,14 +458,13 @@ ethnl_update_bitset32_verbose(u32 *bitmap, unsigned int nbits,
if (nla_type(bit_attr) != ETHTOOL_A_BITSET_BITS_BIT) {
NL_SET_ERR_MSG_ATTR(extack, bit_attr,
"only ETHTOOL_A_BITSET_BITS_BIT allowed in ETHTOOL_A_BITSET_BITS");
ret = -EINVAL;
goto out;
return -EINVAL;
}
ret = ethnl_parse_bit(&idx, &new_val, nbits, bit_attr, no_mask,
names, extack);
if (ret < 0)
goto out;
old_val = orig_bitmap[idx / 32] & ((u32)1 << (idx % 32));
return ret;
old_val = bitmap[idx / 32] & ((u32)1 << (idx % 32));
if (new_val != old_val) {
if (new_val)
bitmap[idx / 32] |= ((u32)1 << (idx % 32));
@ -491,10 +474,7 @@ ethnl_update_bitset32_verbose(u32 *bitmap, unsigned int nbits,
}
}
ret = 0;
out:
kfree(saved_bitmap);
return ret;
return 0;
}
static int ethnl_compact_sanity_checks(unsigned int nbits,