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| author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2013-01-03 14:31:53 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2013-01-08 10:57:08 +0100 |
| commit | 6673cd0bdbc802f2b05453a51fbcf2cf7d8be315 (patch) | |
| tree | 4942c0e100c5c186a4af4f06dc5be26587294134 /drivers/s390/char/con3215.c | |
| parent | s390/irq: count cpu restart events (diff) | |
| download | linux-6673cd0bdbc802f2b05453a51fbcf2cf7d8be315.tar.xz linux-6673cd0bdbc802f2b05453a51fbcf2cf7d8be315.zip | |
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>
Diffstat (limited to 'drivers/s390/char/con3215.c')
| -rw-r--r-- | drivers/s390/char/con3215.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/s390/char/con3215.c b/drivers/s390/char/con3215.c index 1c1dae0deea3..33b7141a182f 100644 --- a/drivers/s390/char/con3215.c +++ b/drivers/s390/char/con3215.c @@ -44,6 +44,7 @@ #define RAW3215_NR_CCWS 3 #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_THROTTLED 8 /* set if reading 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); unsigned long flags; - if (!(raw->port.flags & ASYNC_INITIALIZED)) + if (!(raw->port.flags & ASYNC_INITIALIZED) || + (raw->flags & RAW3215_FIXED)) return; /* Wait for outstanding requests, then free irq */ 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); cdev->handler = raw3215_irq; + raw->flags |= RAW3215_FIXED; + /* Request the console irq */ if (raw3215_startup(raw) != 0) { raw3215_free_info(raw); |