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authorOleg Nesterov <oleg@redhat.com>2015-11-07 03:32:19 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2015-11-07 04:50:42 +0300
commit2e01fabe67ccaff1d59bda01e60a61f5fb0aa7b6 (patch)
tree4db02540f4e0f4f3981965b86ee43cbd88ae517e /drivers/gpu
parent4f05028f8d1af782cfd03d09e0a052e9745dc5ad (diff)
downloadlinux-2e01fabe67ccaff1d59bda01e60a61f5fb0aa7b6.tar.xz
signals: kill block_all_signals() and unblock_all_signals()
It is hardly possible to enumerate all problems with block_all_signals() and unblock_all_signals(). Just for example, 1. block_all_signals(SIGSTOP/etc) simply can't help if the caller is multithreaded. Another thread can dequeue the signal and force the group stop. 2. Even is the caller is single-threaded, it will "stop" anyway. It will not sleep, but it will spin in kernel space until SIGCONT or SIGKILL. And a lot more. In short, this interface doesn't work at all, at least the last 10+ years. Daniel said: Yeah the only times I played around with the DRM_LOCK stuff was when old drivers accidentally deadlocked - my impression is that the entire DRM_LOCK thing was never really tested properly ;-) Hence I'm all for purging where this leaks out of the drm subsystem. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> Acked-by: Dave Airlie <airlied@redhat.com> Cc: Richard Weinberger <richard@nod.at> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/gpu')
-rw-r--r--drivers/gpu/drm/drm_lock.c41
1 files changed, 0 insertions, 41 deletions
diff --git a/drivers/gpu/drm/drm_lock.c b/drivers/gpu/drm/drm_lock.c
index 4924d381b664..daa2ff12101b 100644
--- a/drivers/gpu/drm/drm_lock.c
+++ b/drivers/gpu/drm/drm_lock.c
@@ -38,8 +38,6 @@
#include "drm_legacy.h"
#include "drm_internal.h"
-static int drm_notifier(void *priv);
-
static int drm_lock_take(struct drm_lock_data *lock_data, unsigned int context);
/**
@@ -118,14 +116,8 @@ int drm_legacy_lock(struct drm_device *dev, void *data,
* really probably not the correct answer but lets us debug xkb
* xserver for now */
if (!file_priv->is_master) {
- sigemptyset(&dev->sigmask);
- sigaddset(&dev->sigmask, SIGSTOP);
- sigaddset(&dev->sigmask, SIGTSTP);
- sigaddset(&dev->sigmask, SIGTTIN);
- sigaddset(&dev->sigmask, SIGTTOU);
dev->sigdata.context = lock->context;
dev->sigdata.lock = master->lock.hw_lock;
- block_all_signals(drm_notifier, dev, &dev->sigmask);
}
if (dev->driver->dma_quiescent && (lock->flags & _DRM_LOCK_QUIESCENT))
@@ -169,7 +161,6 @@ int drm_legacy_unlock(struct drm_device *dev, void *data, struct drm_file *file_
/* FIXME: Should really bail out here. */
}
- unblock_all_signals();
return 0;
}
@@ -288,38 +279,6 @@ int drm_legacy_lock_free(struct drm_lock_data *lock_data, unsigned int context)
}
/**
- * If we get here, it means that the process has called DRM_IOCTL_LOCK
- * without calling DRM_IOCTL_UNLOCK.
- *
- * If the lock is not held, then let the signal proceed as usual. If the lock
- * is held, then set the contended flag and keep the signal blocked.
- *
- * \param priv pointer to a drm_device structure.
- * \return one if the signal should be delivered normally, or zero if the
- * signal should be blocked.
- */
-static int drm_notifier(void *priv)
-{
- struct drm_device *dev = priv;
- struct drm_hw_lock *lock = dev->sigdata.lock;
- unsigned int old, new, prev;
-
- /* Allow signal delivery if lock isn't held */
- if (!lock || !_DRM_LOCK_IS_HELD(lock->lock)
- || _DRM_LOCKING_CONTEXT(lock->lock) != dev->sigdata.context)
- return 1;
-
- /* Otherwise, set flag to force call to
- drmUnlock */
- do {
- old = lock->lock;
- new = old | _DRM_LOCK_CONT;
- prev = cmpxchg(&lock->lock, old, new);
- } while (prev != old);
- return 0;
-}
-
-/**
* This function returns immediately and takes the hw lock
* with the kernel context if it is free, otherwise it gets the highest priority when and if
* it is eventually released.