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Merge pull request #1280 from kasjer/kasjer/nrf5x-dma-race

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nrf5x: Fix DMA access race condition
This commit is contained in:
Ha Thach 2022-02-22 21:00:51 +07:00 committed by GitHub
commit e04f15ff3d
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1 changed files with 14 additions and 2 deletions
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16
src/portable/nordic/nrf5x/dcd_nrf5x.c
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@ -79,6 +79,9 @@ typedef struct
} xfer_td_t;
static osal_mutex_def_t dcd_mutex_def;
static osal_mutex_t dcd_mutex;
// Data for managing dcd
static struct
{
@ -154,6 +157,7 @@ static void edpt_dma_start(volatile uint32_t* reg_startep)
// Should be safe to blocking wait until previous DMA transfer complete
uint8_t const rhport = 0;
bool started = false;
osal_mutex_lock(dcd_mutex, OSAL_TIMEOUT_WAIT_FOREVER);
while(!started)
{
// LDREX/STREX may be needed in form of std atomic (required C11) or
@ -170,6 +174,7 @@ static void edpt_dma_start(volatile uint32_t* reg_startep)
// osal_yield();
}
osal_mutex_unlock(dcd_mutex);
}
}
@ -243,6 +248,7 @@ static void xact_in_dma(uint8_t epnum)
void dcd_init (uint8_t rhport)
{
TU_LOG1("dcd init\r\n");
dcd_mutex = osal_mutex_create(&dcd_mutex_def);
(void) rhport;
}
@ -457,11 +463,17 @@ bool dcd_edpt_xfer (uint8_t rhport, uint8_t ep_addr, uint8_t * buffer, uint16_t
xfer_td_t* xfer = get_td(epnum, dir);
dcd_int_disable(rhport);
if (!is_in_isr()) {
osal_mutex_lock(dcd_mutex, OSAL_TIMEOUT_WAIT_FOREVER);
dcd_int_disable(rhport);
}
xfer->buffer = buffer;
xfer->total_len = total_bytes;
xfer->actual_len = 0;
dcd_int_enable(rhport);
if (!is_in_isr()) {
dcd_int_enable(rhport);
osal_mutex_unlock(dcd_mutex);
}
// Control endpoint with zero-length packet and opposite direction to 1st request byte --> status stage
bool const control_status = (epnum == 0 && total_bytes == 0 && dir != tu_edpt_dir(NRF_USBD->BMREQUESTTYPE));