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no need to copy

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This commit is contained in:
J. Nick Koston
2025-09-28 21:29:38 -05:00
parent 5334ddd9f0
commit 9705663e62
1 changed files with 3 additions and 5 deletions
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8
esphome/components/usb_host/usb_host_client.cpp
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@@ -371,11 +371,9 @@ TransferRequest *USBClient::get_trq_() {
} }
// Slot i appears available, try to claim it atomically // Slot i appears available, try to claim it atomically
uint16_t expected = mask;
uint16_t desired = mask | (1U << i); // Set bit i to mark as in-use uint16_t desired = mask | (1U << i); // Set bit i to mark as in-use
if (this->trq_in_use_.compare_exchange_weak(expected, desired, std::memory_order_acquire, if (this->trq_in_use_.compare_exchange_weak(mask, desired, std::memory_order_acquire, std::memory_order_relaxed)) {
std::memory_order_relaxed)) {
// Successfully claimed slot i - prepare the TransferRequest // Successfully claimed slot i - prepare the TransferRequest
auto *trq = &this->requests_[i]; auto *trq = &this->requests_[i];
trq->transfer->context = trq; trq->transfer->context = trq;
@@ -383,8 +381,8 @@ TransferRequest *USBClient::get_trq_() {
return trq; return trq;
} }
// CAS failed - another thread modified the bitmask // CAS failed - another thread modified the bitmask
// Restart search from the beginning with the updated mask // mask was already updated by compare_exchange_weak with the current value
mask = this->trq_in_use_.load(std::memory_order_relaxed); // No need to reload - the CAS already did that for us
i = 0; i = 0;
} }