From: Zhang Lixu <lixu.zhang@intel.com>
Date: Thu, 21 Aug 2025 02:06:09 +0000 (+0800)
Subject: HID: intel-ish-ipc: Remove redundant ready check after timeout function
X-Git-Tag: v6.18-rc1~81^2~8^2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8931f7b27993444adfc8cd1d3c6592cc167fb280;p=thirdparty%2Flinux.git

HID: intel-ish-ipc: Remove redundant ready check after timeout function

timed_wait_for_timeout() internally checks for ish_is_input_ready() and
ishtp_fw_is_ready() based on the provided parameters. If
timed_wait_for_timeout() returns 0, it indicates the status is ready. In
rare cases, another thread may send a message immediately after
timed_wait_for_timeout() returns, causing a subsequent ish_is_input_ready()
check to fail. Since the return value of timed_wait_for_timeout() is
sufficient to determine readiness, the additional ready check is
unnecessary and may introduce issues.

This patch removes the redundant check and relies solely on the return
value of timed_wait_for_timeout().

Fixes: ae02e5d40d5f ("HID: intel-ish-hid: ipc layer")
Signed-off-by: Zhang Lixu <lixu.zhang@intel.com>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>
---

diff --git a/drivers/hid/intel-ish-hid/ipc/ipc.c b/drivers/hid/intel-ish-hid/ipc/ipc.c
index 4c861119e97aa..3ddaa2cd39d55 100644
--- a/drivers/hid/intel-ish-hid/ipc/ipc.c
+++ b/drivers/hid/intel-ish-hid/ipc/ipc.c
@@ -498,6 +498,7 @@ static int ish_fw_reset_handler(struct ishtp_device *dev)
 {
 	uint32_t	reset_id;
 	unsigned long	flags;
+	int ret;
 
 	/* Read reset ID */
 	reset_id = ish_reg_read(dev, IPC_REG_ISH2HOST_MSG) & 0xFFFF;
@@ -510,12 +511,11 @@ static int ish_fw_reset_handler(struct ishtp_device *dev)
 	/* ISHTP notification in IPC_RESET */
 	ishtp_reset_handler(dev);
 
-	if (!ish_is_input_ready(dev))
-		timed_wait_for_timeout(dev, WAIT_FOR_INPUT_RDY,
-			TIME_SLICE_FOR_INPUT_RDY_MS, TIMEOUT_FOR_INPUT_RDY_MS);
-
+	ret = timed_wait_for_timeout(dev, WAIT_FOR_INPUT_RDY,
+				     TIME_SLICE_FOR_INPUT_RDY_MS,
+				     TIMEOUT_FOR_INPUT_RDY_MS);
 	/* ISH FW is dead */
-	if (!ish_is_input_ready(dev))
+	if (ret)
 		return	-EPIPE;
 
 	/* Send clock sync at once after reset */
@@ -531,9 +531,10 @@ static int ish_fw_reset_handler(struct ishtp_device *dev)
 			 sizeof(uint32_t));
 
 	/* Wait for ISH FW'es ILUP and ISHTP_READY */
-	timed_wait_for_timeout(dev, WAIT_FOR_FW_RDY,
-			TIME_SLICE_FOR_FW_RDY_MS, TIMEOUT_FOR_FW_RDY_MS);
-	if (!ishtp_fw_is_ready(dev)) {
+	ret = timed_wait_for_timeout(dev, WAIT_FOR_FW_RDY,
+				     TIME_SLICE_FOR_FW_RDY_MS,
+				     TIMEOUT_FOR_FW_RDY_MS);
+	if (ret) {
 		/* ISH FW is dead */
 		uint32_t	ish_status;