From: Pavel Machek <pavel@ucw.cz>
To: Ivaylo Dimitrov <ivo.g.dimitrov.75@gmail.com>
Cc: sakari.ailus@iki.fi, sre@kernel.org, pali.rohar@gmail.com,
linux-media@vger.kernel.org, galak@codeaurora.org,
mchehab@osg.samsung.com, linux-kernel@vger.kernel.org
Subject: v4.9-rc1: smiapp divides by zero
Date: Sun, 23 Oct 2016 12:22:13 +0200 [thread overview]
Message-ID: <20161023102213.GA13705@amd> (raw)
In-Reply-To: <20161023073322.GA3523@amd>
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Hi!
I tried to update camera code on n900 to v4.9-rc1, and I'm getting
some divide by zero, that eventually cascades into fcam-dev not
working.
mul is zero in my testing, resulting in divide by zero.
(Note that this is going from my patched camera-v4.8 tree to
camera-v4.9 tree.)
Best regards,
Pavel
diff --git a/drivers/media/i2c/smiapp-pll.c b/drivers/media/i2c/smiapp-pll.c
index 5ad1edb..e0a6edd 100644
--- a/drivers/media/i2c/smiapp-pll.c
+++ b/drivers/media/i2c/smiapp-pll.c
@@ -16,6 +16,8 @@
* General Public License for more details.
*/
+#define DEBUG
+
#include <linux/device.h>
#include <linux/gcd.h>
#include <linux/lcm.h>
@@ -457,6 +459,10 @@ int smiapp_pll_calculate(struct device *dev,
i = gcd(pll->pll_op_clk_freq_hz, pll->ext_clk_freq_hz);
mul = div_u64(pll->pll_op_clk_freq_hz, i);
div = pll->ext_clk_freq_hz / i;
+ if (!mul) {
+ dev_err(dev, "forcing mul to 1\n");
+ mul = 1;
+ }
dev_dbg(dev, "mul %u / div %u\n", mul, div);
min_pre_pll_clk_div =
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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next prev parent reply other threads:[~2016-10-23 10:22 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-11 15:39 [PATCH v3 0/2] media: add et8ek8 camera sensor driver and documentation Ivaylo Dimitrov
2016-06-11 15:39 ` [PATCH v3 1/2] media: Driver for Toshiba et8ek8 5MP sensor Ivaylo Dimitrov
2016-06-18 15:22 ` Pavel Machek
2016-06-18 15:37 ` Pali Rohár
2016-06-18 16:04 ` Pavel Machek
2016-06-18 16:11 ` Pali Rohár
2016-06-20 21:59 ` Sakari Ailus
2016-06-11 15:39 ` [PATCH v3 2/2] media: et8ek8: Add documentation Ivaylo Dimitrov
2016-06-14 22:05 ` Rob Herring
2016-06-15 4:31 ` Sakari Ailus
2016-06-15 18:41 ` Rob Herring
2016-06-15 19:24 ` Ivaylo Dimitrov
2016-06-18 14:36 ` Pavel Machek
2016-10-23 7:33 ` [PATCH v3 0/2] media: add et8ek8 camera sensor driver and documentation Pavel Machek
2016-10-23 10:22 ` Pavel Machek [this message]
2016-10-23 10:32 ` v4.9-rc1: smiapp divides by zero Pali Rohár
2016-10-23 10:52 ` Pavel Machek
2016-10-23 14:09 ` Sakari Ailus
2016-10-23 18:33 ` Pavel Machek
2016-10-23 18:05 ` [PATCH v3 0/2] media: add et8ek8 camera sensor driver and documentation Ivaylo Dimitrov
2016-10-23 18:17 ` Pavel Machek
2016-10-23 18:36 ` Ivaylo Dimitrov
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