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linux: Drain the console fd of data when using evdev for keyboards

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Works around a silly bug in the kernel that causes wakeup storms after
too many keypresses.  Should fix the kernel bug too, but this at least
keeps the idle wakeup count below 1000/sec.
This commit is contained in:
Adam Jackson 2008-11-05 11:51:06 -05:00
parent 6d21fbf006
commit 446d9443ce
1 changed files with 17 additions and 0 deletions
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17
hw/xfree86/os-support/linux/lnx_init.c
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@ -85,6 +85,14 @@ restoreVtPerms(void)
chown(vtname, vtPermSave[2], vtPermSave[3]);
}
static void *console_handler;
static void
drain_console(int fd, void *closure)
{
tcflush(fd, TCIOFLUSH);
}
void
xf86OpenConsole(void)
{
@ -300,6 +308,10 @@ xf86OpenConsole(void)
cfsetispeed(&nTty, 9600);
cfsetospeed(&nTty, 9600);
tcsetattr(xf86Info.consoleFd, TCSANOW, &nTty);
/* need to keep the buffer clean, else the kernel gets angry */
console_handler = xf86AddGeneralHandler(xf86Info.consoleFd,
drain_console, NULL);
}
/* we really should have a InitOSInputDevices() function instead
@ -346,6 +358,11 @@ xf86CloseConsole()
if (ShareVTs) return;
if (console_handler) {
xf86RemoveGeneralHandler(console_handler);
console_handler = NULL;
};
#if defined(DO_OS_FONTRESTORE)
if (ioctl(xf86Info.consoleFd, VT_GETSTATE, &vts) < 0)
xf86Msg(X_WARNING, "xf86CloseConsole: VT_GETSTATE failed: %s\n",