diff options
| author |   Martin Schwidefsky <schwidefsky@de.ibm.com> | 2019-04-03 09:13:34 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2019-04-10 17:46:22 +0200 |
| commit | 5712f3301a12c0c3de9cc423484496b0464f2faf (patch) | |
| tree | 908924352bac4ef16da0c73609b365a4ff3dac1e /drivers/s390/char/con3270.c | |
| parent | s390/dasd: Fix capacity calculation for large volumes (diff) | |
| download | linux-dev-5712f3301a12c0c3de9cc423484496b0464f2faf.tar.xz linux-dev-5712f3301a12c0c3de9cc423484496b0464f2faf.zip | |
s390/3270: fix lockdep false positive on view->lock
The spinlock in the raw3270_view structure is used by con3270, tty3270
and fs3270 in different ways. For con3270 the lock can be acquired in
irq context, for tty3270 and fs3270 the highest context is bh.
Lockdep sees the view->lock as a single class and if the 3270 driver
is used for the console the following message is generated:
WARNING: inconsistent lock state
5.1.0-rc3-05157-g5c168033979d #12 Not tainted
--------------------------------
inconsistent {IN-HARDIRQ-W} -> {HARDIRQ-ON-W} usage.
swapper/0/1 [HC0[0]:SC1[1]:HE1:SE0] takes:
(____ptrval____) (&(&view->lock)->rlock){?.-.}, at: tty3270_update+0x7c/0x330
Introduce a lockdep subclass for the view lock to distinguish bh from
irq locks.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/char/con3270.c')
| -rw-r--r-- | drivers/s390/char/con3270.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/s390/char/con3270.c b/drivers/s390/char/con3270.c index fd2146bcc0ad..e17364e13d2f 100644 --- a/drivers/s390/char/con3270.c +++ b/drivers/s390/char/con3270.c @@ -629,7 +629,7 @@ con3270_init(void) (void (*)(unsigned long)) con3270_read_tasklet, (unsigned long) condev->read); - raw3270_add_view(&condev->view, &con3270_fn, 1); + raw3270_add_view(&condev->view, &con3270_fn, 1, RAW3270_VIEW_LOCK_IRQ); INIT_LIST_HEAD(&condev->freemem); for (i = 0; i < CON3270_STRING_PAGES; i++) { |