#ifndef __SOUND_I2C_H
#define __SOUND_I2C_H
/*
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*
*/
#define SND_I2C_DEVICE_ADDRTEN (1<<0) /* 10-bit I2C address */
struct snd_i2c_device {
struct list_head list;
struct snd_i2c_bus *bus; /* I2C bus */
char name[32]; /* some useful device name */
unsigned short flags; /* device flags */
unsigned short addr; /* device address (might be 10-bit) */
unsigned long private_value;
void *private_data;
void (*private_free)(struct snd_i2c_device *device);
};
#define snd_i2c_device(n) list_entry(n, struct snd_i2c_device, list)
struct snd_i2c_bit_ops {
void (*start)(struct snd_i2c_bus *bus); /* transfer start */
void (*stop)(struct snd_i2c_bus *bus); /* transfer stop */
void (*direction)(struct snd_i2c_bus *bus, int clock, int data); /* set line direction (0 = write, 1 = read) */
void (*setlines)(struct snd_i2c_bus *bus, int clock, int data);
int (*getclock)(struct snd_i2c_bus *bus);
int (*getdata)(struct snd_i2c_bus *bus, int ack);
};
struct snd_i2c_ops {
int (*sendbytes)(struct snd_i2c_device *device, unsigned char *bytes, int count);
int (*readbytes)(struct snd_i2c_device *device, unsigned char *bytes, int count);
int (*probeaddr)(struct snd_i2c_bus *bus, unsigned short addr);
};
struct snd_i2c_bus {
struct snd_card *card; /* card which I2C belongs to */
char name[32]; /* some useful label */
struct mutex lock_mutex;
struct snd_i2c_bus *master; /* master bus when SCK/SCL is shared */
struct list_head buses; /* master: slave buses sharing SCK/SCL, slave: link list */
struct list_head devices; /* attached devices to this bus */
union {
struct snd_i2c_bit_ops *bit;
void *ops;
} hw_ops; /* lowlevel operations */
const struct snd_i2c_ops *ops; /* midlevel operations */
unsigned long private_value;
void *private_data;
void (*private_free)(struct snd_i2c_bus *bus);
};
#define snd_i2c_slave_bus(n) list_entry(n, struct snd_i2c_bus, buses)
int snd_i2c_bus_create(struct snd_card *card, const char *name,
struct snd_i2c_bus *master, struct snd_i2c_bus **ri2c);
int snd_i2c_device_create(struct snd_i2c_bus *bus, const char *name,
unsigned char addr, struct snd_i2c_device **rdevice);
int snd_i2c_device_free(struct snd_i2c_device *device);
static inline void snd_i2c_lock(struct snd_i2c_bus *bus)
{
if (bus->master)
mutex_lock(&bus->master->lock_mutex);
else
mutex_lock(&bus->lock_mutex);
}
static inline void snd_i2c_unlock(struct snd_i2c_bus *bus)
{
if (bus->master)
mutex_unlock(&bus->master->lock_mutex);
else
mutex_unlock(&bus->lock_mutex);
}
int snd_i2c_sendbytes(struct snd_i2c_device *device, unsigned char *bytes, int count);
int snd_i2c_readbytes(struct snd_i2c_device *device, unsigned char *bytes, int count);
int snd_i2c_probeaddr(struct snd_i2c_bus *bus, unsigned short addr);
#endif /* __SOUND_I2C_H */
='selected'>3
drm/i915: Check for NULL i915_vma in intel_unpin_fb_obj()
I've seen this trigger twice now, where the i915_gem_object_to_ggtt()
call in intel_unpin_fb_obj() returns NULL, resulting in an oops
immediately afterwards as the (inlined) call to i915_vma_unpin_fence()
tries to dereference it.
It seems to be some race condition where the object is going away at
shutdown time, since both times happened when shutting down the X
server. The call chains were different:
- VT ioctl(KDSETMODE, KD_TEXT):
intel_cleanup_plane_fb+0x5b/0xa0 [i915]
drm_atomic_helper_cleanup_planes+0x6f/0x90 [drm_kms_helper]
intel_atomic_commit_tail+0x749/0xfe0 [i915]
intel_atomic_commit+0x3cb/0x4f0 [i915]
drm_atomic_commit+0x4b/0x50 [drm]
restore_fbdev_mode+0x14c/0x2a0 [drm_kms_helper]
drm_fb_helper_restore_fbdev_mode_unlocked+0x34/0x80 [drm_kms_helper]
drm_fb_helper_set_par+0x2d/0x60 [drm_kms_helper]
intel_fbdev_set_par+0x18/0x70 [i915]
fb_set_var+0x236/0x460
fbcon_blank+0x30f/0x350
do_unblank_screen+0xd2/0x1a0
vt_ioctl+0x507/0x12a0
tty_ioctl+0x355/0xc30
do_vfs_ioctl+0xa3/0x5e0
SyS_ioctl+0x79/0x90
entry_SYSCALL_64_fastpath+0x13/0x94
- i915 unpin_work workqueue:
intel_unpin_work_fn+0x58/0x140 [i915]
process_one_work+0x1f1/0x480
worker_thread+0x48/0x4d0
kthread+0x101/0x140
and this patch purely papers over the issue by adding a NULL pointer
check and a WARN_ON_ONCE() to avoid the oops that would then generally
make the machine unresponsive.
Other callers of i915_gem_object_to_ggtt() seem to also check for the
returned pointer being NULL and warn about it, so this clearly has
happened before in other places.
[ Reported it originally to the i915 developers on Jan 8, applying the
ugly workaround on my own now after triggering the problem for the
second time with no feedback.
This is likely to be the same bug reported as
https://bugs.freedesktop.org/show_bug.cgi?id=98829
https://bugs.freedesktop.org/show_bug.cgi?id=99134
which has a patch for the underlying problem, but it hasn't gotten to
me, so I'm applying the workaround. ]
Cc: Daniel Vetter <daniel.vetter@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Imre Deak <imre.deak@intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/crypto/acompress.h')