linux-kernel - [PATCH] snsc: pass timeout as HZ independent value

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Date:	Wed, 27 May 2015 18:34:47 +0200
From:	Nicholas Mc Guire <hofrat@...dl.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, Nicholas Mc Guire <hofrat@...dl.org>
Subject: [PATCH] snsc: pass timeout as HZ independent value

schedule_timeout takes a timeout in jiffies but the code currently is
passing in a constant SCDRV_TIMEOUT which makes this timeout HZ
dependent, so pass it through msecs_to_jiffies() to fix this up.

patch was compile tested with generic_defconfig (implies CONFIG_SGI_SNSC=y)

Patch is against 4.0-rc5 (localversion-next is -next-20150527)

Signed-off-by: Nicholas Mc Guire <hofrat@...dl.org>
---

As there is no documentation of the intended timeout it might be wrong
to convert it with msecs_to_jiffies as this reduces the actual jiffies
value by at least a factor of 10 - so someone that knows this driver
needs to check on the actual value - but in any case it needs to be
passed in a HZ independent way. 

Also the whole ia64 build did not look like it was too well maintained,
- lots of build warnings - so not sure if such cleanup patches here make 
too much sense.

 drivers/char/snsc.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/char/snsc.c b/drivers/char/snsc.c
index 8bab592..8a80ead 100644
--- a/drivers/char/snsc.c
+++ b/drivers/char/snsc.c
@@ -198,7 +198,7 @@ scdrv_read(struct file *file, char __user *buf, size_t count, loff_t *f_pos)
 		add_wait_queue(&sd->sd_rq, &wait);
 		spin_unlock_irqrestore(&sd->sd_rlock, flags);
 
-		schedule_timeout(SCDRV_TIMEOUT);
+		schedule_timeout(msecs_to_jiffies(SCDRV_TIMEOUT));
 
 		remove_wait_queue(&sd->sd_rq, &wait);
 		if (signal_pending(current)) {
@@ -294,7 +294,7 @@ scdrv_write(struct file *file, const char __user *buf,
 		add_wait_queue(&sd->sd_wq, &wait);
 		spin_unlock_irqrestore(&sd->sd_wlock, flags);
 
-		schedule_timeout(SCDRV_TIMEOUT);
+		schedule_timeout(msecs_to_jiffies(SCDRV_TIMEOUT));
 
 		remove_wait_queue(&sd->sd_wq, &wait);
 		if (signal_pending(current)) {
-- 
1.7.10.4

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