Commit 4aea5a9e authored by Chris Wilson's avatar Chris Wilson

drm/i915/gem: Mark up the racy read of the mmap_singleton

[11057.642683] BUG: KCSAN: data-race in i915_gem_mmap [i915] / singleton_release [i915]
[11057.642717]
[11057.642740] write (marked) to 0xffff8881f24471a0 of 8 bytes by task 44668 on cpu 2:
[11057.643162]  singleton_release+0x38/0x60 [i915]
[11057.643192]  __fput+0x160/0x3c0
[11057.643217]  ____fput+0x16/0x20
[11057.643241]  task_work_run+0xba/0x100
[11057.643263]  exit_to_usermode_loop+0xe4/0xf0
[11057.643286]  do_syscall_64+0x27e/0x2c0
[11057.643314]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[11057.643339]
[11057.643359] read to 0xffff8881f24471a0 of 8 bytes by task 44667 on cpu 3:
[11057.643774]  i915_gem_mmap+0x295/0x670 [i915]
[11057.643802]  mmap_region+0x62b/0xac0
[11057.643825]  do_mmap+0x414/0x6b0
[11057.643848]  vm_mmap_pgoff+0xa9/0xf0
[11057.643875]  ksys_mmap_pgoff+0x1ac/0x2f0
[11057.643900]  do_syscall_64+0x6e/0x2c0
[11057.643924]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
Signed-off-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: default avatarMika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200311092624.10012-3-chris@chris-wilson.co.uk
parent 60ef5b7a
...@@ -775,7 +775,7 @@ static struct file *mmap_singleton(struct drm_i915_private *i915) ...@@ -775,7 +775,7 @@ static struct file *mmap_singleton(struct drm_i915_private *i915)
struct file *file; struct file *file;
rcu_read_lock(); rcu_read_lock();
file = i915->gem.mmap_singleton; file = READ_ONCE(i915->gem.mmap_singleton);
if (file && !get_file_rcu(file)) if (file && !get_file_rcu(file))
file = NULL; file = NULL;
rcu_read_unlock(); rcu_read_unlock();
......
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