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s390/3215: partially revert tty close handling fix 

Partially revert ae289dc1f "s390/3215: fix tty close handling", since this
leads sometimes to hanging agetty processes and therefore systems that get
stuck while starting.

This was magically fixed (bisected) by a common code patch from Alan Cox:
36b3c070 "tty: Move the handling of the tty release logic", however it was
unrelated.

Since the removed code worked for a decade, nobody knows anymore why it was
in there in the first place and debugging the observed hang is non-trivial
(at least for me :) ), let's just re-add the removed code before we see
other side effects.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
This commit is contained in:
Heiko Carstens 2013-01-03 14:31:53 +01:00 committed by Martin Schwidefsky
parent 93f3b2ee0a
commit 6673cd0bdb
1 changed files with 5 additions and 1 deletions
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6
drivers/s390/char/con3215.c
View File

@ -44,6 +44,7 @@
#define RAW3215_NR_CCWS 3 #define RAW3215_NR_CCWS 3
#define RAW3215_TIMEOUT HZ/10 /* time for delayed output */ #define RAW3215_TIMEOUT HZ/10 /* time for delayed output */
#define RAW3215_FIXED 1 /* 3215 console device is not be freed */
#define RAW3215_WORKING 4 /* set if a request is being worked on */ #define RAW3215_WORKING 4 /* set if a request is being worked on */
#define RAW3215_THROTTLED 8 /* set if reading is disabled */ #define RAW3215_THROTTLED 8 /* set if reading is disabled */
#define RAW3215_STOPPED 16 /* set if writing is disabled */ #define RAW3215_STOPPED 16 /* set if writing is disabled */
@ -630,7 +631,8 @@ static void raw3215_shutdown(struct raw3215_info *raw)
DECLARE_WAITQUEUE(wait, current); DECLARE_WAITQUEUE(wait, current);
unsigned long flags; unsigned long flags;
if (!(raw->port.flags & ASYNC_INITIALIZED)) if (!(raw->port.flags & ASYNC_INITIALIZED) ||
(raw->flags & RAW3215_FIXED))
return; return;
/* Wait for outstanding requests, then free irq */ /* Wait for outstanding requests, then free irq */
spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags); spin_lock_irqsave(get_ccwdev_lock(raw->cdev), flags);
@ -927,6 +929,8 @@ static int __init con3215_init(void)
dev_set_drvdata(&cdev->dev, raw); dev_set_drvdata(&cdev->dev, raw);
cdev->handler = raw3215_irq; cdev->handler = raw3215_irq;
raw->flags |= RAW3215_FIXED;
/* Request the console irq */ /* Request the console irq */
if (raw3215_startup(raw) != 0) { if (raw3215_startup(raw) != 0) {
raw3215_free_info(raw); raw3215_free_info(raw);