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interrupt: Split set_handler context.

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Since introducing the ctx pointer, the handler is now two words, so setting it can
race with the interrupt firing. On race it's possible for the new handler to be
alled with the old ctx pointer or viceversa.

Rather than documenting this, it's better to split the function in two to make it
obvious to the user that it's not atomic. The user can use a critical section, or
disable/enable the interrupt to avoid races if this is a concern.
This commit is contained in:
Dario Nieuwenhuis
2021-02-26 02:04:48 +01:00
parent 17cf301d4f
commit da91779117
10 changed files with 41 additions and 42 deletions
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12
embassy-stm32f4/src/rtc.rs
View File

@ -92,13 +92,11 @@ impl<T: Instance> RTC<T> {
self.rtc.set_compare(0, 0x8000);
self.rtc.set_compare_interrupt(0, true);
self.irq.set_handler(
|ptr| unsafe {
let this = &*(ptr as *const () as *const Self);
this.on_interrupt();
},
self as *const _ as *mut _,
);
self.irq.set_handler(|ptr| unsafe {
let this = &*(ptr as *const () as *const Self);
this.on_interrupt();
});
self.irq.set_handler_context(self as *const _ as *mut _);
self.irq.unpend();
self.irq.enable();

6
embassy-stm32f4/src/serial.rs
View File

@ -70,9 +70,9 @@ impl Serial<USART1, Stream7<DMA2>, Stream2<DMA2>> {
let (usart, _) = serial.release();
// Register ISR
tx_int.set_handler(Self::on_tx_irq, core::ptr::null_mut());
rx_int.set_handler(Self::on_rx_irq, core::ptr::null_mut());
usart_int.set_handler(Self::on_rx_irq, core::ptr::null_mut());
tx_int.set_handler(Self::on_tx_irq);
rx_int.set_handler(Self::on_rx_irq);
usart_int.set_handler(Self::on_rx_irq);
// usart_int.unpend();
// usart_int.enable();