From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>,
Sasha Levin <sashal@kernel.org>,
linux-s390@vger.kernel.org
Subject: [PATCH AUTOSEL 3.18 04/10] s390/3270: fix lockdep false positive on view->lock
Date: Tue, 7 May 2019 01:42:40 -0400 [thread overview]
Message-ID: <20190507054247.537-4-sashal@kernel.org> (raw)
In-Reply-To: <20190507054247.537-1-sashal@kernel.org>
From: Martin Schwidefsky <schwidefsky@de.ibm.com>
[ Upstream commit 5712f3301a12c0c3de9cc423484496b0464f2faf ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/s390/char/con3270.c | 2 +-
drivers/s390/char/fs3270.c | 3 ++-
drivers/s390/char/raw3270.c | 3 ++-
drivers/s390/char/raw3270.h | 4 +++-
drivers/s390/char/tty3270.c | 3 ++-
5 files changed, 10 insertions(+), 5 deletions(-)
diff --git a/drivers/s390/char/con3270.c b/drivers/s390/char/con3270.c
index 7c511add5aa7..84b6c5080a79 100644
--- a/drivers/s390/char/con3270.c
+++ b/drivers/s390/char/con3270.c
@@ -622,7 +622,7 @@ 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++) {
diff --git a/drivers/s390/char/fs3270.c b/drivers/s390/char/fs3270.c
index 71e974738014..f0c86bcbe316 100644
--- a/drivers/s390/char/fs3270.c
+++ b/drivers/s390/char/fs3270.c
@@ -463,7 +463,8 @@ fs3270_open(struct inode *inode, struct file *filp)
init_waitqueue_head(&fp->wait);
fp->fs_pid = get_pid(task_pid(current));
- rc = raw3270_add_view(&fp->view, &fs3270_fn, minor);
+ rc = raw3270_add_view(&fp->view, &fs3270_fn, minor,
+ RAW3270_VIEW_LOCK_BH);
if (rc) {
fs3270_free_view(&fp->view);
goto out;
diff --git a/drivers/s390/char/raw3270.c b/drivers/s390/char/raw3270.c
index 220acb4cbee5..9c350e6d75bf 100644
--- a/drivers/s390/char/raw3270.c
+++ b/drivers/s390/char/raw3270.c
@@ -956,7 +956,7 @@ raw3270_deactivate_view(struct raw3270_view *view)
* Add view to device with minor "minor".
*/
int
-raw3270_add_view(struct raw3270_view *view, struct raw3270_fn *fn, int minor)
+raw3270_add_view(struct raw3270_view *view, struct raw3270_fn *fn, int minor, int subclass)
{
unsigned long flags;
struct raw3270 *rp;
@@ -978,6 +978,7 @@ raw3270_add_view(struct raw3270_view *view, struct raw3270_fn *fn, int minor)
view->cols = rp->cols;
view->ascebc = rp->ascebc;
spin_lock_init(&view->lock);
+ lockdep_set_subclass(&view->lock, subclass);
list_add(&view->list, &rp->view_list);
rc = 0;
spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags);
diff --git a/drivers/s390/char/raw3270.h b/drivers/s390/char/raw3270.h
index e1e41c2861fb..5ae54317857a 100644
--- a/drivers/s390/char/raw3270.h
+++ b/drivers/s390/char/raw3270.h
@@ -155,6 +155,8 @@ struct raw3270_fn {
struct raw3270_view {
struct list_head list;
spinlock_t lock;
+#define RAW3270_VIEW_LOCK_IRQ 0
+#define RAW3270_VIEW_LOCK_BH 1
atomic_t ref_count;
struct raw3270 *dev;
struct raw3270_fn *fn;
@@ -163,7 +165,7 @@ struct raw3270_view {
unsigned char *ascebc; /* ascii -> ebcdic table */
};
-int raw3270_add_view(struct raw3270_view *, struct raw3270_fn *, int);
+int raw3270_add_view(struct raw3270_view *, struct raw3270_fn *, int, int);
int raw3270_activate_view(struct raw3270_view *);
void raw3270_del_view(struct raw3270_view *);
void raw3270_deactivate_view(struct raw3270_view *);
diff --git a/drivers/s390/char/tty3270.c b/drivers/s390/char/tty3270.c
index e96fc7fd9498..ab95d24b991b 100644
--- a/drivers/s390/char/tty3270.c
+++ b/drivers/s390/char/tty3270.c
@@ -937,7 +937,8 @@ static int tty3270_install(struct tty_driver *driver, struct tty_struct *tty)
return PTR_ERR(tp);
rc = raw3270_add_view(&tp->view, &tty3270_fn,
- tty->index + RAW3270_FIRSTMINOR);
+ tty->index + RAW3270_FIRSTMINOR,
+ RAW3270_VIEW_LOCK_BH);
if (rc) {
tty3270_free_view(tp);
return rc;
--
2.20.1
next prev parent reply other threads:[~2019-05-07 5:43 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-07 5:42 [PATCH AUTOSEL 3.18 01/10] iio: adc: xilinx: fix potential use-after-free on remove Sasha Levin
2019-05-07 5:42 ` [PATCH AUTOSEL 3.18 02/10] HID: input: add mapping for keyboard Brightness Up/Down/Toggle keys Sasha Levin
2019-05-07 5:42 ` [PATCH AUTOSEL 3.18 03/10] s390/dasd: Fix capacity calculation for large volumes Sasha Levin
2019-05-07 5:42 ` Sasha Levin [this message]
2019-05-07 5:42 ` [PATCH AUTOSEL 3.18 05/10] KVM: x86: avoid misreporting level-triggered irqs as edge-triggered in tracing Sasha Levin
2019-05-07 5:42 ` [PATCH AUTOSEL 3.18 06/10] tools lib traceevent: Fix missing equality check for strcmp Sasha Levin
2019-05-07 5:42 ` [PATCH AUTOSEL 3.18 07/10] init: initialize jump labels before command line option parsing Sasha Levin
2019-05-07 5:42 ` [PATCH AUTOSEL 3.18 08/10] s390: ctcm: fix ctcm_new_device error return code Sasha Levin
2019-05-07 5:42 ` [PATCH AUTOSEL 3.18 09/10] selftests/net: correct the return value for run_netsocktests Sasha Levin
2019-05-07 5:42 ` [PATCH AUTOSEL 3.18 10/10] gpu: ipu-v3: dp: fix CSC handling Sasha Levin
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20190507054247.537-4-sashal@kernel.org \
--to=sashal@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-s390@vger.kernel.org \
--cc=schwidefsky@de.ibm.com \
--cc=stable@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).