mbox series

[v3,0/1] binder: return pending info for frozen async txns

Message ID 20221123201654.589322-1-dualli@chromium.org
Headers
Series binder: return pending info for frozen async txns |

Message

Li Li Nov. 23, 2022, 8:16 p.m. UTC 
  From: Li Li <dualli@google.com>

User applications need to know if their binder transactions reach a
frozen process or not. For sync binder calls, Linux kernel already
has a dedicated return value BR_FROZEN_REPLY, indicating this sync
binder transaction will be rejected (similar to BR_DEAD_REPLY) as the
target process is frozen. But for async binder calls, the user space
application doesn't have a way to know if the target process is frozen.

This patch adds a new return value, BR_TRANSACTION_PENDING_FROZEN, to
fix this issue. Similar to BR_TRANSACTION_COMPLETE, it means the async
binder transaction has been put in the queue of the target process, but
it's waiting for the target process to be unfrozen.

v1: checkpatch.pl --strict passed
v2: protect proc->is_frozen with lock, fix typo in comments
v3: rename BR_TRANSACTION_PENDING to BR_TRANSACTION_PENDING_FROZEN to
    signify the frozen scenario and avoid potential confusion

Li Li (1):
  binder: return pending info for frozen async txns

 drivers/android/binder.c            | 32 +++++++++++++++++++++++------
 drivers/android/binder_internal.h   |  3 ++-
 include/uapi/linux/android/binder.h |  7 ++++++-
 3 files changed, 34 insertions(+), 8 deletions(-)