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do not create /dev/rtc symlink, let systemd search for it if needed

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The export of the RTCs hctosys flag is uneccesary, the kernel takes care
of the persistemt clock management itself, without any need for:
  CONFIG_RTC_HCTOSYS=y
  CONFIG_RTC_HCTOSYS_DEVICE="rtc0"

"Chaotic hardware platforms" without native kernel persistent clock
support will find the proper RTC with the logic rtc_open() without
the need for a custom symlink.
This commit is contained in:
Kay Sievers 2013-04-24 19:12:44 +02:00
parent 83cb95b530
commit 2b3c81b02f
2 changed files with 8 additions and 12 deletions
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3
rules/50-udev-default.rules
View File

@ -1,6 +1,5 @@
# do not edit this file, it will be overwritten on update
SUBSYSTEM=="rtc", ATTR{hctosys}=="1", SYMLINK+="rtc"
SUBSYSTEM=="virtio-ports", KERNEL=="vport*", ATTR{name}=="?*", SYMLINK+="virtio-ports/$attr{name}"
SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", IMPORT{builtin}="usb_id", IMPORT{builtin}="hwdb --subsystem=usb"
@ -15,8 +14,6 @@ SUBSYSTEM=="tty", KERNEL=="tty[0-9]*", GROUP="tty", MODE="0620"
SUBSYSTEM=="vc", KERNEL=="vcs*|vcsa*", GROUP="tty"
KERNEL=="tty[A-Z]*[0-9]|pppox[0-9]*|ircomm[0-9]*|noz[0-9]*|rfcomm[0-9]*", GROUP="dialout"
SUBSYSTEM=="rtc", ATTR{hctosys}=="1", MODE="0644"
SUBSYSTEM=="mem", KERNEL=="mem|kmem|port", GROUP="kmem", MODE="0640"
SUBSYSTEM=="input", KERNEL=="mouse*|mice|event*", MODE="0640"

17
src/shared/hwclock.c
View File

@ -47,15 +47,14 @@ static int rtc_open(int flags) {
int fd;
DIR *d;
/* First, we try to make use of the /dev/rtc symlink. If that
* doesn't exist, we open the first RTC which has hctosys=1
* set. If we don't find any we just take the first RTC that
* exists at all. */
fd = open("/dev/rtc", flags);
if (fd >= 0)
return fd;
/*
* Some "chaotic platforms" have multiple RTCs and we need to
* find the "system RTC", which is in some setups /dev/rtc1.
*
* First, we try to find the RTC which has hctosys=1 set. If we
* don't find any we just take the first RTC that exists at all,
* then try to open /dev/rtc0.
*/
d = opendir("/sys/class/rtc");
if (!d)
goto fallback;