linux-kernel - [PATCH v2] Staging: fbtft: Fix bug in fbtft-core

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Message-Id: <1475422955-10231-1-git-send-email-ksenija.stanojevic@gmail.com>
Date:   Sun,  2 Oct 2016 17:42:35 +0200
From:   Ksenija Stanojevic <ksenija.stanojevic@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     thomas.petazzoni@...e-electrons.com, noralf@...nnes.org,
        gregkh@...uxfoundation.org, devel@...verdev.osuosl.org,
        stable@...r.kernel.org,
        Ksenija Stanojevic <ksenija.stanojevic@...il.com>
Subject: [PATCH v2] Staging: fbtft: Fix bug in fbtft-core

Commit 367e8560e8d7a62d96e9b1d644028a3816e04206 introduced a bug
in fbtft-core where fps is always 0, this is because variable
update_time is not assigned correctly.

Signed-off-by: Ksenija Stanojevic <ksenija.stanojevic@...il.com>
Fixes: 367e8560e8d7 ("Staging: fbtbt: Replace timespec with ktime_t")
---
Changes in v2:
 - add Fixes tag

 drivers/staging/fbtft/fbtft-core.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/fbtft/fbtft-core.c b/drivers/staging/fbtft/fbtft-core.c
index d9046162..587f68a 100644
--- a/drivers/staging/fbtft/fbtft-core.c
+++ b/drivers/staging/fbtft/fbtft-core.c
@@ -391,11 +391,11 @@ static void fbtft_update_display(struct fbtft_par *par, unsigned int start_line,
 
 	if (unlikely(timeit)) {
 		ts_end = ktime_get();
-		if (ktime_to_ns(par->update_time))
+		if (!ktime_to_ns(par->update_time))
 			par->update_time = ts_start;
 
-		par->update_time = ts_start;
 		fps = ktime_us_delta(ts_start, par->update_time);
+		par->update_time = ts_start;
 		fps = fps ? 1000000 / fps : 0;
 
 		throughput = ktime_us_delta(ts_end, ts_start);
-- 
1.9.1