* [PATCH] net: sun4i: fix timeout check
@ 2013-07-23 1:09 Emilio López
2013-07-23 13:31 ` Maxime Ripard
0 siblings, 1 reply; 3+ messages in thread
From: Emilio López @ 2013-07-23 1:09 UTC (permalink / raw)
To: Maxime Ripard, davem; +Cc: netdev, Emilio López
The current timeout check is comparing two constant values, so it won't
ever detect a timeout. This patch reworks the affected code a bit so it
has a chance at detecting timeouts correctly.
Signed-off-by: Emilio López <emilio@elopez.com.ar>
---
drivers/net/phy/mdio-sun4i.c | 14 ++++++--------
1 file changed, 6 insertions(+), 8 deletions(-)
diff --git a/drivers/net/phy/mdio-sun4i.c b/drivers/net/phy/mdio-sun4i.c
index 61d3f4e..7f25e49 100644
--- a/drivers/net/phy/mdio-sun4i.c
+++ b/drivers/net/phy/mdio-sun4i.c
@@ -40,7 +40,7 @@ struct sun4i_mdio_data {
static int sun4i_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
{
struct sun4i_mdio_data *data = bus->priv;
- unsigned long start_jiffies;
+ unsigned long timeout_jiffies;
int value;
/* issue the phy address and reg */
@@ -49,10 +49,9 @@ static int sun4i_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
writel(0x1, data->membase + EMAC_MAC_MCMD_REG);
/* Wait read complete */
- start_jiffies = jiffies;
+ timeout_jiffies = jiffies + MDIO_TIMEOUT;
while (readl(data->membase + EMAC_MAC_MIND_REG) & 0x1) {
- if (time_after(start_jiffies,
- start_jiffies + MDIO_TIMEOUT))
+ if (time_is_before_jiffies(timeout_jiffies))
return -ETIMEDOUT;
msleep(1);
}
@@ -69,7 +68,7 @@ static int sun4i_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
u16 value)
{
struct sun4i_mdio_data *data = bus->priv;
- unsigned long start_jiffies;
+ unsigned long timeout_jiffies;
/* issue the phy address and reg */
writel((mii_id << 8) | regnum, data->membase + EMAC_MAC_MADR_REG);
@@ -77,10 +76,9 @@ static int sun4i_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
writel(0x1, data->membase + EMAC_MAC_MCMD_REG);
/* Wait read complete */
- start_jiffies = jiffies;
+ timeout_jiffies = jiffies + MDIO_TIMEOUT;
while (readl(data->membase + EMAC_MAC_MIND_REG) & 0x1) {
- if (time_after(start_jiffies,
- start_jiffies + MDIO_TIMEOUT))
+ if (time_is_before_jiffies(timeout_jiffies))
return -ETIMEDOUT;
msleep(1);
}
--
1.8.3.3
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] net: sun4i: fix timeout check
2013-07-23 1:09 [PATCH] net: sun4i: fix timeout check Emilio López
@ 2013-07-23 13:31 ` Maxime Ripard
2013-07-25 0:04 ` David Miller
0 siblings, 1 reply; 3+ messages in thread
From: Maxime Ripard @ 2013-07-23 13:31 UTC (permalink / raw)
To: Emilio López; +Cc: davem, netdev
[-- Attachment #1: Type: text/plain, Size: 514 bytes --]
On Mon, Jul 22, 2013 at 10:09:18PM -0300, Emilio López wrote:
> The current timeout check is comparing two constant values, so it won't
> ever detect a timeout. This patch reworks the affected code a bit so it
> has a chance at detecting timeouts correctly.
>
> Signed-off-by: Emilio López <emilio@elopez.com.ar>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Thanks!
Maxime
--
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] net: sun4i: fix timeout check
2013-07-23 13:31 ` Maxime Ripard
@ 2013-07-25 0:04 ` David Miller
0 siblings, 0 replies; 3+ messages in thread
From: David Miller @ 2013-07-25 0:04 UTC (permalink / raw)
To: maxime.ripard; +Cc: emilio, netdev
From: Maxime Ripard <maxime.ripard@free-electrons.com>
Date: Tue, 23 Jul 2013 15:31:14 +0200
> On Mon, Jul 22, 2013 at 10:09:18PM -0300, Emilio López wrote:
>> The current timeout check is comparing two constant values, so it won't
>> ever detect a timeout. This patch reworks the affected code a bit so it
>> has a chance at detecting timeouts correctly.
>>
>> Signed-off-by: Emilio López <emilio@elopez.com.ar>
>
> Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Applied.
^ permalink raw reply [flat|nested] 3+ messages in thread
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