diff options
author | Tuomas Tynkkynen <ttynkkynen@nvidia.com> | 2012-08-15 17:54:38 +0300 |
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committer | Simone Willett <swillett@nvidia.com> | 2012-08-27 17:17:27 -0700 |
commit | ce8ef677d55d74149d75a0ccf8e3b493bf68e110 (patch) | |
tree | e908741d51a483cad669e91e957ffb160aeb7315 /sound | |
parent | b536b496165f0de2e854e6297f54371e27233dd2 (diff) |
video: tegra: nvmap: fix handle usecount tracking
A handle's usecount used to be incremented once during the mmap ioctl,
and decremented when the mapping is closed by the kernel. However, that
fails if a mapping cloned, for example if the mapping was split due to
a munmap, or (presumably) during fork, as the decrement will then happen
for each cloned mapping.
Therefore increment the usecount when a mapping is opened.
Also fix a BUG_ON() that would have caught this bug, if it wouldn't
have done the check by checking if the unsigned usecount field is
less than zero.
Bug 1033981
Change-Id: I72ac9361a19e44f91ffd6b1126f4632e0f7b6726
Signed-off-by: Tuomas Tynkkynen <ttynkkynen@nvidia.com>
Reviewed-on: http://git-master/r/123710
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Krishna Reddy <vdumpa@nvidia.com>
Diffstat (limited to 'sound')
0 files changed, 0 insertions, 0 deletions