(nuttx) branch master updated: uart: fix FSM check to avoid PM deadlocks

[acassis]

This is an automated email from the ASF dual-hosted git repository.

acassis pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/nuttx.git


The following commit(s) were added to refs/heads/master by this push:
     new 7fe0fbd9b89 uart: fix FSM check to avoid PM deadlocks
7fe0fbd9b89 is described below

commit 7fe0fbd9b8922e8efcd97f992499853a2bd049d9
Author: Thiago Finelon <thiago.sfine...@gmail.com>
AuthorDate: Fri Oct 3 14:00:13 2025 -0300

    uart: fix FSM check to avoid PM deadlocks
    
    Incorrect FSM status checks in the suspend path could cause
    deadlocks when power management was enabled. This patch fixes
    the condition to allow proper UART suspend/resume handling.
    
    Signed-off-by: Thiago Finelon <thiago.sfine...@gmail.com>
---
 arch/xtensa/src/esp32s3/esp32s3_pm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/xtensa/src/esp32s3/esp32s3_pm.c 
b/arch/xtensa/src/esp32s3/esp32s3_pm.c
index 20647acd691..a801e678b01 100644
--- a/arch/xtensa/src/esp32s3/esp32s3_pm.c
+++ b/arch/xtensa/src/esp32s3/esp32s3_pm.c
@@ -320,7 +320,7 @@ static void IRAM_ATTR esp32s3_suspend_uarts(void)
                   UART_SW_FLOW_CON_EN | UART_FORCE_XOFF);
       do
         {
-          uart_fsm = REG_GET_FIELD(UART_STATUS_REG(i), UART_ST_UTX_OUT);
+          uart_fsm = REG_GET_FIELD(UART_FSM_STATUS_REG(i), UART_ST_UTX_OUT);
         }
       while (!(uart_fsm == UART_FSM_IDLE ||
                uart_fsm == UART_FSM_TX_WAIT_SEND));