| Message ID | 20201110073757.1284594-1-thierry.reding@gmail.com (mailing list archive) |
|---|---|
| State | Accepted |
| Delegated to: | Netdev Maintainers |
| Headers | show |
| Series | [net/next] net: ipconfig: Avoid spurious blank lines in boot log | expand |
| Context | Check | Description |
|---|---|---|
| netdev/cover_letter | success | Link |
| netdev/fixes_present | fail | Series targets non-next tree, but doesn't contain any Fixes tags |
| netdev/patch_count | success | Link |
| netdev/tree_selection | success | Clearly marked for net |
| netdev/subject_prefix | success | Link |
| netdev/source_inline | success | Was 0 now: 0 |
| netdev/verify_signedoff | success | Link |
| netdev/module_param | success | Was 0 now: 0 |
| netdev/build_32bit | success | Errors and warnings before: 1 this patch: 1 |
| netdev/kdoc | success | Errors and warnings before: 0 this patch: 0 |
| netdev/verify_fixes | success | Link |
| netdev/checkpatch | success | total: 0 errors, 0 warnings, 0 checks, 43 lines checked |
| netdev/build_allmodconfig_warn | success | Errors and warnings before: 1 this patch: 1 |
| netdev/header_inline | success | Link |
| netdev/stable | success | Stable not CCed |
On Tue, 10 Nov 2020 08:37:57 +0100 Thierry Reding wrote: > From: Thierry Reding <treding@nvidia.com> > > When dumping the name and NTP servers advertised by DHCP, a blank line > is emitted if either of the lists is empty. This can lead to confusing > issues such as the blank line getting flagged as warning. This happens > because the blank line is the result of pr_cont("\n") and that may see > its level corrupted by some other driver concurrently writing to the > console. > > Fix this by making sure that the terminating newline is only emitted > if at least one entry in the lists was printed before. > > Reported-by: Jon Hunter <jonathanh@nvidia.com> > Signed-off-by: Thierry Reding <treding@nvidia.com> Applied, thanks!
diff --git a/net/ipv4/ipconfig.c b/net/ipv4/ipconfig.c index 561f15b5a944..3cd13e1bc6a7 100644 --- a/net/ipv4/ipconfig.c +++ b/net/ipv4/ipconfig.c @@ -1441,7 +1441,7 @@ static int __init ip_auto_config(void) int retries = CONF_OPEN_RETRIES; #endif int err; - unsigned int i; + unsigned int i, count; /* Initialise all name servers and NTP servers to NONE (but only if the * "ip=" or "nfsaddrs=" kernel command line parameters weren't decoded, @@ -1575,7 +1575,7 @@ static int __init ip_auto_config(void) if (ic_dev_mtu) pr_cont(", mtu=%d", ic_dev_mtu); /* Name servers (if any): */ - for (i = 0; i < CONF_NAMESERVERS_MAX; i++) { + for (i = 0, count = 0; i < CONF_NAMESERVERS_MAX; i++) { if (ic_nameservers[i] != NONE) { if (i == 0) pr_info(" nameserver%u=%pI4", @@ -1583,12 +1583,14 @@ static int __init ip_auto_config(void) else pr_cont(", nameserver%u=%pI4", i, &ic_nameservers[i]); + + count++; } - if (i + 1 == CONF_NAMESERVERS_MAX) + if ((i + 1 == CONF_NAMESERVERS_MAX) && count > 0) pr_cont("\n"); } /* NTP servers (if any): */ - for (i = 0; i < CONF_NTP_SERVERS_MAX; i++) { + for (i = 0, count = 0; i < CONF_NTP_SERVERS_MAX; i++) { if (ic_ntp_servers[i] != NONE) { if (i == 0) pr_info(" ntpserver%u=%pI4", @@ -1596,8 +1598,10 @@ static int __init ip_auto_config(void) else pr_cont(", ntpserver%u=%pI4", i, &ic_ntp_servers[i]); + + count++; } - if (i + 1 == CONF_NTP_SERVERS_MAX) + if ((i + 1 == CONF_NTP_SERVERS_MAX) && count > 0) pr_cont("\n"); } #endif /* !SILENT */