linux-kernel - [PATCH v2 1/2] fpga: socfpga: use 'time_left' variable with wait_for

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Date: Thu, 20 Jun 2024 13:50:21 +0200
From: Wolfram Sang <wsa+renesas@...g-engineering.com>
To: linux-kernel@...r.kernel.org
Cc: Wolfram Sang <wsa+renesas@...g-engineering.com>,
	Moritz Fischer <mdf@...nel.org>,
	Wu Hao <hao.wu@...el.com>,
	Xu Yilun <yilun.xu@...el.com>,
	Tom Rix <trix@...hat.com>,
	linux-fpga@...r.kernel.org
Subject: [PATCH v2 1/2] fpga: socfpga: use 'time_left' variable with wait_for_completion*()

There is a confusing pattern in the kernel to use a variable named
'timeout' to store the result of
wait_for_completion_interruptible_timeout() causing patterns like:

        timeout = wait_for_completion_interruptible_timeout(...)
        if (!timeout) return -ETIMEDOUT;

with all kinds of permutations. Use 'time_left' as a variable to make
the code self explaining.

Fix to the proper variable type 'long' while here.

Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
---

Change since v1:
* use reverse-xmas-tree for variable init
* keep chars/line limits in commit message

 drivers/fpga/socfpga.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/fpga/socfpga.c b/drivers/fpga/socfpga.c
index 723ea0ad3f09..f772b754aa76 100644
--- a/drivers/fpga/socfpga.c
+++ b/drivers/fpga/socfpga.c
@@ -301,16 +301,17 @@ static irqreturn_t socfpga_fpga_isr(int irq, void *dev_id)
 
 static int socfpga_fpga_wait_for_config_done(struct socfpga_fpga_priv *priv)
 {
-	int timeout, ret = 0;
+	long time_left;
+	int ret = 0;
 
 	socfpga_fpga_disable_irqs(priv);
 	init_completion(&priv->status_complete);
 	socfpga_fpga_enable_irqs(priv, SOCFPGA_FPGMGR_MON_CONF_DONE);
 
-	timeout = wait_for_completion_interruptible_timeout(
+	time_left = wait_for_completion_interruptible_timeout(
 						&priv->status_complete,
 						msecs_to_jiffies(10));
-	if (timeout == 0)
+	if (time_left == 0)
 		ret = -ETIMEDOUT;
 
 	socfpga_fpga_disable_irqs(priv);
-- 
2.43.0