Does anything actually break without this patch?
My reading of unregister_console says we will acquire
the console semaphore, walk the list, fail to find the
console, relase the semaphore, and return.
Hmm... unless there is a problem with the console preference
code? I don't see anything that should deref a bad pointer,
maybe it breaks the preference?
From get web:
if (console_drivers == NULL)
preferred_console = selected_console;
else if (console->flags & CON_CONSDEV)
console_drivers->flags |= CON_CONSDEV;
On Sep 7, 2005, at 4:52 AM, Stephen Rothwell wrote:
The earlier commit 8d9273918635f0301368c01b56c03a6f339e8d51
(Consolidate early console and PPCDBG code) broke iSeries because
it caused unregister_console(&udbg_console) to be called
unconditionally. iSeries never registers the udbg_console.
This just reverts part of the change.
Signed-off-by: Stephen Rothwell <[email protected]>
---
arch/ppc64/kernel/udbg.c | 6 ++++++
1 files changed, 6 insertions(+), 0 deletions(-)
--
Cheers,
Stephen Rothwell [email protected]
http://www.canb.auug.org.au/~sfr/
234f5032f6ccb4d72e4b74d33af55716b67d8a27
diff --git a/arch/ppc64/kernel/udbg.c b/arch/ppc64/kernel/udbg.c
--- a/arch/ppc64/kernel/udbg.c
+++ b/arch/ppc64/kernel/udbg.c
@@ -158,14 +158,20 @@ static struct console udbg_console = {
.index = -1,
};
+static int early_console_initialized;
+
void __init disable_early_printk(void)
{
+ if (!early_console_initialized)
+ return;
unregister_console(&udbg_console);
+ early_console_initialized = 0;
}
/* called by setup_system */
void register_early_udbg_console(void)
{
+ early_console_initialized = 1;
register_console(&udbg_console);
}
-
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