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tty fixes from git and tpm fix from f14

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This commit is contained in:
Kyle McMartin 2010-11-29 09:19:24 -05:00
parent 25202fe3cf
commit 769514dd99
5 changed files with 296 additions and 0 deletions
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17
kernel.spec
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@ -746,6 +746,12 @@ Patch12407: hda_realtek-handle-unset-external-amp-bits.patch
Patch12410: tty-make-tiocgicount-a-handler.patch
Patch12411: tty-icount-changeover-for-other-main-devices.patch
Patch12413: tpm-autodetect-itpm-devices.patch
Patch12415: tty-dont-allow-reopen-when-ldisc-is-changing.patch
Patch12416: tty-ldisc-fix-open-flag-handling.patch
Patch12417: tty-open-hangup-race-fixup.patch
%endif
BuildRoot: %{_tmppath}/kernel-%{KVERREL}-root
@ -1393,6 +1399,12 @@ ApplyPatch hda_realtek-handle-unset-external-amp-bits.patch
ApplyPatch tty-make-tiocgicount-a-handler.patch
ApplyPatch tty-icount-changeover-for-other-main-devices.patch
ApplyPatch tpm-autodetect-itpm-devices.patch
ApplyPatch tty-dont-allow-reopen-when-ldisc-is-changing.patch
ApplyPatch tty-ldisc-fix-open-flag-handling.patch
ApplyPatch tty-open-hangup-race-fixup.patch
# END OF PATCH APPLICATIONS
%endif
@ -2006,6 +2018,11 @@ fi
# || ||
%changelog
* Mon Nov 29 2010 Kyle McMartin <kyle@redhat.com>
- tpm-autodetect-itpm-devices.patch: Auto-fix TPM issues on various
laptops which prevented suspend/resume. (#647132)
- tty fixes from kernel-git (#630464)
* Fri Nov 26 2010 Kyle McMartin <kyle@redhat.com>
- Quiet a build warning the previous INET_DIAG fix caused.

65
tpm-autodetect-itpm-devices.patch Normal file
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@ -0,0 +1,65 @@
commit 8cf5102c84dba60b2ea29b7e89f1a65100e20bb9
Author: Matthew Garrett <mjg@redhat.com>
Date: Thu Oct 21 17:31:56 2010 -0400
tpm: Autodetect itpm devices
Some Lenovos have TPMs that require a quirk to function correctly. This can
be autodetected by checking whether the device has a _HID of INTC0102. This
is an invalid PNPid, and as such is discarded by the pnp layer - however
it's still present in the ACPI code, so we can pull it out that way. This
means that the quirk won't be automatically applied on non-ACPI systems,
but without ACPI we don't have any way to identify the chip anyway so I
don't think that's a great concern.
Signed-off-by: Matthew Garrett <mjg@redhat.com>
diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
index 1030f84..c17a305 100644
--- a/drivers/char/tpm/tpm_tis.c
+++ b/drivers/char/tpm/tpm_tis.c
@@ -25,6 +25,7 @@
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/wait.h>
+#include <linux/acpi.h>
#include "tpm.h"
#define TPM_HEADER_SIZE 10
@@ -78,6 +79,26 @@ enum tis_defaults {
static LIST_HEAD(tis_chips);
static DEFINE_SPINLOCK(tis_lock);
+#ifdef CONFIG_ACPI
+static int is_itpm(struct pnp_dev *dev)
+{
+ struct acpi_device *acpi = pnp_acpi_device(dev);
+ struct acpi_hardware_id *id;
+
+ list_for_each_entry(id, &acpi->pnp.ids, list) {
+ if (!strcmp("INTC0102", id->id))
+ return 1;
+ }
+
+ return 0;
+}
+#else
+static int is_itpm(struct pnp_dev *dev)
+{
+ return 0;
+}
+#endif
+
static int check_locality(struct tpm_chip *chip, int l)
{
if ((ioread8(chip->vendor.iobase + TPM_ACCESS(l)) &
@@ -472,6 +493,9 @@ static int tpm_tis_init(struct device *dev, resource_size_t start,
"1.2 TPM (device-id 0x%X, rev-id %d)\n",
vendor >> 16, ioread8(chip->vendor.iobase + TPM_RID(0)));
+ if (is_itpm(to_pnp_dev(dev)))
+ itpm = 1;
+
if (itpm)
dev_info(dev, "Intel iTPM workaround enabled\n");

84
tty-dont-allow-reopen-when-ldisc-is-changing.patch Normal file
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@ -0,0 +1,84 @@
From jirislaby@gmail.com Thu Nov 25 12:16:42 2010
From: Jiri Slaby <jslaby@suse.cz>
Subject: [PATCH 1/1] TTY: don't allow reopen when ldisc is changing
Date: Thu, 25 Nov 2010 18:16:23 +0100
There are many WARNINGs like the following reported nowadays:
WARNING: at drivers/tty/tty_io.c:1331 tty_open+0x2a2/0x49a()
Hardware name: Latitude E6500
Modules linked in:
Pid: 1207, comm: plymouthd Not tainted 2.6.37-rc3-mmotm1123 #3
Call Trace:
[<ffffffff8103b189>] warn_slowpath_common+0x80/0x98
[<ffffffff8103b1b6>] warn_slowpath_null+0x15/0x17
[<ffffffff8128a3ab>] tty_open+0x2a2/0x49a
[<ffffffff810fd53f>] chrdev_open+0x11d/0x146
...
This means tty_reopen is called without TTY_LDISC set. For further
considerations, note tty_lock is held in tty_open. TTY_LDISC is cleared in:
1) __tty_hangup from tty_ldisc_hangup to tty_ldisc_enable. During this
section tty_lock is held.
2) tty_release via tty_ldisc_release till the end of tty existence. If
tty->count <= 1, tty_lock is taken, TTY_CLOSING bit set and then
tty_ldisc_release called. tty_reopen checks TTY_CLOSING before checking
TTY_LDISC.
3) tty_set_ldisc from tty_ldisc_halt to tty_ldisc_enable. We:
* take tty_lock, set TTY_LDISC_CHANGING, put tty_lock
* call tty_ldisc_halt (clear TTY_LDISC), tty_lock is _not_ held
* do some other work
* take tty_lock, call tty_ldisc_enable (set TTY_LDISC), put
tty_lock
So the only option I see is 3). The solution is to check
TTY_LDISC_CHANGING along with TTY_CLOSING in tty_reopen.
Nicely reproducible with two processes:
while (1) {
fd = open("/dev/ttyS1", O_RDWR);
if (fd < 0) {
warn("open");
continue;
}
close(fd);
}
--------
while (1) {
fd = open("/dev/ttyS1", O_RDWR);
ld1 = 0; ld2 = 2;
while (1) {
ioctl(fd, TIOCSETD, &ld1);
ioctl(fd, TIOCSETD, &ld2);
}
close(fd);
}
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Reported-by: <Valdis.Kletnieks@vt.edu>
Cc: Kyle McMartin <kyle@mcmartin.ca>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
---
drivers/tty/tty_io.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index c05c5af..878f6d6 100644
--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -1310,7 +1310,8 @@ static int tty_reopen(struct tty_struct *tty)
{
struct tty_driver *driver = tty->driver;
- if (test_bit(TTY_CLOSING, &tty->flags))
+ if (test_bit(TTY_CLOSING, &tty->flags) ||
+ test_bit(TTY_LDISC_CHANGING, &tty->flags))
return -EIO;
if (driver->type == TTY_DRIVER_TYPE_PTY &&
--
1.7.3.1

54
tty-ldisc-fix-open-flag-handling.patch Normal file
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@ -0,0 +1,54 @@
From linux-kernel-owner@vger.kernel.org Wed Nov 24 18:28:11 2010
From: Jiri Slaby <jslaby@suse.cz>
Subject: [PATCH 1/2] TTY: ldisc, fix open flag handling
Date: Thu, 25 Nov 2010 00:27:54 +0100
When a concrete ldisc open fails in tty_ldisc_open, we forget to clear
TTY_LDISC_OPEN. This causes a false warning on the next ldisc open:
WARNING: at drivers/char/tty_ldisc.c:445 tty_ldisc_open+0x26/0x38()
Hardware name: System Product Name
Modules linked in: ...
Pid: 5251, comm: a.out Tainted: G W 2.6.32-5-686 #1
Call Trace:
[<c1030321>] ? warn_slowpath_common+0x5e/0x8a
[<c1030357>] ? warn_slowpath_null+0xa/0xc
[<c119311c>] ? tty_ldisc_open+0x26/0x38
[<c11936c5>] ? tty_set_ldisc+0x218/0x304
...
So clear the bit when failing...
Introduced in c65c9bc3efa (tty: rewrite the ldisc locking) back in
2.6.31-rc1.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Alan Cox <alan@linux.intel.com>
Reported-by: Sergey Lapin <slapin@ossfans.org>
Tested-by: Sergey Lapin <slapin@ossfans.org>
---
drivers/tty/tty_ldisc.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/drivers/tty/tty_ldisc.c b/drivers/tty/tty_ldisc.c
index d8e96b0..4214d58 100644
--- a/drivers/char/tty_ldisc.c
+++ b/drivers/char/tty_ldisc.c
@@ -454,6 +454,8 @@ static int tty_ldisc_open(struct tty_struct *tty, struct tty_ldisc *ld)
/* BTM here locks versus a hangup event */
WARN_ON(!tty_locked());
ret = ld->ops->open(tty);
+ if (ret)
+ clear_bit(TTY_LDISC_OPEN, &tty->flags);
return ret;
}
return 0;
--
1.7.3.1
--
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76
tty-open-hangup-race-fixup.patch Normal file
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@ -0,0 +1,76 @@
From 9e88e8b9915b5e067507a087437d80e6a133d612 Mon Sep 17 00:00:00 2001
From: Jiri Slaby <jslaby@suse.cz>
Date: Sat, 27 Nov 2010 16:06:46 +0100
Subject: [PATCH 1/1] TTY: open/hangup race fixup
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
drivers/tty/tty_io.c | 10 +++++++++-
include/linux/tty.h | 1 +
2 files changed, 10 insertions(+), 1 deletions(-)
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index 878f6d6..35480dd 100644
--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -559,6 +559,9 @@ void __tty_hangup(struct tty_struct *tty)
tty_lock();
+ /* some functions below drop BTM, so we need this bit */
+ set_bit(TTY_HUPPING, &tty->flags);
+
/* inuse_filps is protected by the single tty lock,
this really needs to change if we want to flush the
workqueue with the lock held */
@@ -578,6 +581,10 @@ void __tty_hangup(struct tty_struct *tty)
}
spin_unlock(&tty_files_lock);
+ /*
+ * it drops BTM and thus races with reopen
+ * we protect the race by TTY_HUPPING
+ */
tty_ldisc_hangup(tty);
read_lock(&tasklist_lock);
@@ -615,7 +622,6 @@ void __tty_hangup(struct tty_struct *tty)
tty->session = NULL;
tty->pgrp = NULL;
tty->ctrl_status = 0;
- set_bit(TTY_HUPPED, &tty->flags);
spin_unlock_irqrestore(&tty->ctrl_lock, flags);
/* Account for the p->signal references we killed */
@@ -641,6 +647,7 @@ void __tty_hangup(struct tty_struct *tty)
* can't yet guarantee all that.
*/
set_bit(TTY_HUPPED, &tty->flags);
+ clear_bit(TTY_HUPPING, &tty->flags);
tty_ldisc_enable(tty);
tty_unlock();
@@ -1311,6 +1318,7 @@ static int tty_reopen(struct tty_struct *tty)
struct tty_driver *driver = tty->driver;
if (test_bit(TTY_CLOSING, &tty->flags) ||
+ test_bit(TTY_HUPPING, &tty->flags) ||
test_bit(TTY_LDISC_CHANGING, &tty->flags))
return -EIO;
diff --git a/include/linux/tty.h b/include/linux/tty.h
index 032d79f..54e4eaa 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -366,6 +366,7 @@ struct tty_file_private {
#define TTY_HUPPED 18 /* Post driver->hangup() */
#define TTY_FLUSHING 19 /* Flushing to ldisc in progress */
#define TTY_FLUSHPENDING 20 /* Queued buffer flush pending */
+#define TTY_HUPPING 21 /* ->hangup() in progress */
#define TTY_WRITE_FLUSH(tty) tty_write_flush((tty))
--
1.7.3.1