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053c095a82
Contrary to common expectations for an "int" return, these functions
return only a positive value -- if used correctly they cannot even
return 0 because the message header will necessarily be in the skb.
This makes the very common pattern of
if (genlmsg_end(...) < 0) { ... }
be a whole bunch of dead code. Many places also simply do
return nlmsg_end(...);
and the caller is expected to deal with it.
This also commonly (at least for me) causes errors, because it is very
common to write
if (my_function(...))
/* error condition */
and if my_function() does "return nlmsg_end()" this is of course wrong.
Additionally, there's not a single place in the kernel that actually
needs the message length returned, and if anyone needs it later then
it'll be very easy to just use skb->len there.
Remove this, and make the functions void. This removes a bunch of dead
code as described above. The patch adds lines because I did
- return nlmsg_end(...);
+ nlmsg_end(...);
+ return 0;
I could have preserved all the function's return values by returning
skb->len, but instead I've audited all the places calling the affected
functions and found that none cared. A few places actually compared
the return value with <= 0 in dump functionality, but that could just
be changed to < 0 with no change in behaviour, so I opted for the more
efficient version.
One instance of the error I've made numerous times now is also present
in net/phonet/pn_netlink.c in the route_dumpit() function - it didn't
check for <0 or <=0 and thus broke out of the loop every single time.
I've preserved this since it will (I think) have caused the messages to
userspace to be formatted differently with just a single message for
every SKB returned to userspace. It's possible that this isn't needed
for the tools that actually use this, but I don't even know what they
are so couldn't test that changing this behaviour would be acceptable.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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| .. | ||
| int340x_thermal | ||
| samsung | ||
| st | ||
| ti-soc-thermal | ||
| armada_thermal.c | ||
| clock_cooling.c | ||
| cpu_cooling.c | ||
| db8500_cpufreq_cooling.c | ||
| db8500_thermal.c | ||
| dove_thermal.c | ||
| fair_share.c | ||
| gov_bang_bang.c | ||
| imx_thermal.c | ||
| intel_powerclamp.c | ||
| intel_soc_dts_thermal.c | ||
| Kconfig | ||
| kirkwood_thermal.c | ||
| Makefile | ||
| of-thermal.c | ||
| rcar_thermal.c | ||
| rockchip_thermal.c | ||
| spear_thermal.c | ||
| step_wise.c | ||
| tegra_soctherm.c | ||
| thermal_core.c | ||
| thermal_core.h | ||
| thermal_hwmon.c | ||
| thermal_hwmon.h | ||
| user_space.c | ||
| x86_pkg_temp_thermal.c | ||