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Revert "binder: Prevent context manager from incrementing ref 0"

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This reverts commit c5665cafbedd2e2a523fe933e452391a02d3adb3.

This patch was causing display hangs for Qualcomm after the 5.4.58
merge.

Bug: 166779391
Change-Id: Iaf22ede68247422709b00f059e5c4d517f219adf
Signed-off-by: Todd Kjos <tkjos@google.com>
This commit is contained in:
Todd Kjos 2020-08-28 08:55:25 -07:00
parent 6410fbaaaf
commit a0c68fd8e8
1 changed files with 1 additions and 14 deletions
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15
drivers/android/binder.c
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@ -3081,12 +3081,6 @@ static void binder_transaction(struct binder_proc *proc,
goto err_dead_binder;
}
e->to_node = target_node->debug_id;
if (WARN_ON(proc == target_proc)) {
return_error = BR_FAILED_REPLY;
return_error_param = -EINVAL;
return_error_line = __LINE__;
goto err_invalid_target_handle;
}
if (security_binder_transaction(proc->tsk,
target_proc->tsk) < 0) {
return_error = BR_FAILED_REPLY;
@ -3689,17 +3683,10 @@ static int binder_thread_write(struct binder_proc *proc,
struct binder_node *ctx_mgr_node;
mutex_lock(&context->context_mgr_node_lock);
ctx_mgr_node = context->binder_context_mgr_node;
if (ctx_mgr_node) {
if (ctx_mgr_node->proc == proc) {
binder_user_error("%d:%d context manager tried to acquire desc 0\n",
proc->pid, thread->pid);
mutex_unlock(&context->context_mgr_node_lock);
return -EINVAL;
}
if (ctx_mgr_node)
ret = binder_inc_ref_for_node(
proc, ctx_mgr_node,
strong, NULL, &rdata);
}
mutex_unlock(&context->context_mgr_node_lock);
}
if (ret)