[PATCH] ACPI: APEI: Fix ERST timeout unit conversion

[Nirmoy Das]

The ACPI specification defines bits 63:32 returned by
GET_EXECUTE_OPERATION_TIMINGS as the maximum execution time in
microseconds. erst_get_timeout() instead multiplies the value by
NSEC_PER_MSEC.

Use NSEC_PER_USEC to express the firmware-provided microsecond timeout
in the nanosecond units expected by erst_timedout().

Fixes: fac475aab70b ("ACPI: APEI: Use ERST timeout for slow devices")
Cc: stable@xxxxxxxxxxxxxxx
Assisted-by: Codex:gpt-5.6-sol
Signed-off-by: Nirmoy Das <nirmoyd@xxxxxxxxxx>
---
 drivers/acpi/apei/erst.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/acpi/apei/erst.c b/drivers/acpi/apei/erst.c
index bf65e34615314..15ab797641cfc 100644
--- a/drivers/acpi/apei/erst.c
+++ b/drivers/acpi/apei/erst.c
@@ -108,7 +108,7 @@ static inline u64 erst_get_timeout(void)
 
 	if (erst_erange.attr & ERST_RANGE_SLOW) {
 		timeout = ((erst_erange.timings & ERST_EXEC_TIMING_MAX_MASK) >>
-			ERST_EXEC_TIMING_MAX_SHIFT) * NSEC_PER_MSEC;
+			ERST_EXEC_TIMING_MAX_SHIFT) * NSEC_PER_USEC;
 		if (timeout < FIRMWARE_TIMEOUT)
 			timeout = FIRMWARE_TIMEOUT;
 	}
-- 
2.43.0