linux-kernel - [PATCH 2/2] fsi/sbefifo: Fix reset timeout

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Date:   Fri, 24 Jul 2020 16:45:18 +0930
From:   Joel Stanley <joel@....id.au>
To:     linux-fsi@...ts.ozlabs.org
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Joachim Fenkes <FENKES@...ibm.com>,
        linux-kernel@...r.kernel.org, Jeremy Kerr <jk@...abs.org>,
        Alistar Popple <alistair@...ple.id.au>,
        Eddie James <eajames@...ux.ibm.com>,
        Joachim Fenkes <fenkes@...ibm.com>
Subject: [PATCH 2/2] fsi/sbefifo: Fix reset timeout

From: Joachim Fenkes <FENKES@...ibm.com>

On BMCs with lower timer resolution than 1ms, msleep(1) will take
way longer than 1ms, so looping 10k times won't wait for 10s but
significantly longer.

Fix this by using jiffies like the rest of the code.

Fixes: 9f4a8a2d7f9d ("fsi/sbefifo: Add driver for the SBE FIFO")
Signed-off-by: Joachim Fenkes <fenkes@...ibm.com>
Signed-off-by: Joel Stanley <joel@....id.au>
---
 drivers/fsi/fsi-sbefifo.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/fsi/fsi-sbefifo.c b/drivers/fsi/fsi-sbefifo.c
index 655b45c1f6ba..3ad9510ad4a4 100644
--- a/drivers/fsi/fsi-sbefifo.c
+++ b/drivers/fsi/fsi-sbefifo.c
@@ -325,6 +325,7 @@ static int sbefifo_up_write(struct sbefifo *sbefifo, __be32 word)
 static int sbefifo_request_reset(struct sbefifo *sbefifo)
 {
 	struct device *dev = &sbefifo->fsi_dev->dev;
+	unsigned long end_time;
 	u32 status, timeout;
 	int rc;
 
@@ -341,7 +342,8 @@ static int sbefifo_request_reset(struct sbefifo *sbefifo)
 	}
 
 	/* Wait for it to complete */
-	for (timeout = 0; timeout < SBEFIFO_RESET_TIMEOUT; timeout++) {
+	end_time = jiffies + msecs_to_jiffies(SBEFIFO_RESET_TIMEOUT);
+	while (!time_after(jiffies, end_time)) {
 		rc = sbefifo_regr(sbefifo, SBEFIFO_UP | SBEFIFO_STS, &status);
 		if (rc) {
 			dev_err(dev, "Failed to read UP fifo status during reset"
@@ -355,7 +357,7 @@ static int sbefifo_request_reset(struct sbefifo *sbefifo)
 			return 0;
 		}
 
-		msleep(1);
+		cond_resched();
 	}
 	dev_err(dev, "FIFO reset timed out\n");
 
-- 
2.27.0