From 9a1be3ad0eb874b4bc6a2c4ad98f2d89af3e1bf5 Mon Sep 17 00:00:00 2001
From: Jerry Zhang <zhangjerry@google.com>
Date: Wed, 14 Mar 2018 14:57:31 -0700
Subject: [PATCH] adb: Remove usages of ENDPOINT_ALLOC

All devices that previously used ENDPOINT_ALLOC
are on the new async io routines. None of the devices
using aio_compat have ENDPOINT_ALLOC so remove the
code to stop logging failures.

Fixes: 74213465
Test: adb works
Change-Id: I0c903eb76b006b6bcce48cec24f5353fa47cc128
---
 adb/daemon/usb.cpp | 33 ++-------------------------------
 adb/daemon/usb.h   |  2 --
 2 files changed, 2 insertions(+), 33 deletions(-)

diff --git a/adb/daemon/usb.cpp b/adb/daemon/usb.cpp
index 87ed3db67..c2e933782 100644
--- a/adb/daemon/usb.cpp
+++ b/adb/daemon/usb.cpp
@@ -58,10 +58,6 @@ using namespace std::chrono_literals;
 #define cpu_to_le16(x) htole16(x)
 #define cpu_to_le32(x) htole32(x)
 
-#define FUNCTIONFS_ENDPOINT_ALLOC       _IOR('g', 231, __u32)
-
-static constexpr size_t ENDPOINT_ALLOC_RETRIES = 10;
-
 static int dummy_fd = -1;
 
 struct func_desc {
@@ -256,7 +252,6 @@ bool init_functionfs(struct usb_handle* h) {
     ssize_t ret;
     struct desc_v1 v1_descriptor;
     struct desc_v2 v2_descriptor;
-    size_t retries = 0;
 
     v2_descriptor.header.magic = cpu_to_le32(FUNCTIONFS_DESCRIPTORS_MAGIC_V2);
     v2_descriptor.header.length = cpu_to_le32(sizeof(v2_descriptor));
@@ -324,30 +319,6 @@ bool init_functionfs(struct usb_handle* h) {
 
     h->read_aiob.fd = h->bulk_out;
     h->write_aiob.fd = h->bulk_in;
-
-    h->max_rw = MAX_PAYLOAD;
-    while (h->max_rw >= USB_FFS_BULK_SIZE && retries < ENDPOINT_ALLOC_RETRIES) {
-        int ret_in = ioctl(h->bulk_in, FUNCTIONFS_ENDPOINT_ALLOC, static_cast<__u32>(h->max_rw));
-        int errno_in = errno;
-        int ret_out = ioctl(h->bulk_out, FUNCTIONFS_ENDPOINT_ALLOC, static_cast<__u32>(h->max_rw));
-        int errno_out = errno;
-
-        if (ret_in || ret_out) {
-            if (errno_in == ENODEV || errno_out == ENODEV) {
-                std::this_thread::sleep_for(100ms);
-                retries += 1;
-                continue;
-            }
-            h->max_rw /= 2;
-        } else {
-            return true;
-        }
-    }
-
-    D("[ adb: cannot call endpoint alloc: errno=%d ]", errno);
-    // Kernel pre-allocation could have failed for recoverable reasons.
-    // Continue running with a safe max rw size.
-    h->max_rw = USB_FFS_BULK_SIZE;
     return true;
 
 err:
@@ -401,7 +372,7 @@ static int usb_ffs_write(usb_handle* h, const void* data, int len) {
 
     const char* buf = static_cast<const char*>(data);
     while (len > 0) {
-        int write_len = std::min(h->max_rw, len);
+        int write_len = std::min(USB_FFS_BULK_SIZE, len);
         int n = adb_write(h->bulk_in, buf, write_len);
         if (n < 0) {
             D("ERROR: fd = %d, n = %d: %s", h->bulk_in, n, strerror(errno));
@@ -420,7 +391,7 @@ static int usb_ffs_read(usb_handle* h, void* data, int len) {
 
     char* buf = static_cast<char*>(data);
     while (len > 0) {
-        int read_len = std::min(h->max_rw, len);
+        int read_len = std::min(USB_FFS_BULK_SIZE, len);
         int n = adb_read(h->bulk_out, buf, read_len);
         if (n < 0) {
             D("ERROR: fd = %d, n = %d: %s", h->bulk_out, n, strerror(errno));
diff --git a/adb/daemon/usb.h b/adb/daemon/usb.h
index db1a6d6db..15a7f6539 100644
--- a/adb/daemon/usb.h
+++ b/adb/daemon/usb.h
@@ -54,7 +54,5 @@ struct usb_handle {
     // read and write threads.
     struct aio_block read_aiob;
     struct aio_block write_aiob;
-
-    int max_rw;
 };