Messages in this thread Patch in this message | | | Date | Tue, 24 Apr 2012 15:33:05 -0700 | From | Greg KH <> | Subject | [ 12/42] davinci_mdio: Fix MDIO timeout check |
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3.0-stable review patch. If anyone has any objections, please let me know.
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From: Christian Riesch <christian.riesch@omicron.at>
commit 5b76d0600b2b08eef77f8e9226938b7b6bde3099 upstream.
Under heavy load (flood ping) it is possible for the MDIO timeout to expire before the loop checks the GO bit again. This patch adds an additional check whether the operation was done before actually returning -ETIMEDOUT.
To reproduce this bug, flood ping the device, e.g., ping -f -l 1000 After some time, a "timed out waiting for user access" warning may appear. And even worse, link may go down since the PHY reported a timeout.
Signed-off-by: Christian Riesch <christian.riesch@omicron.at> Cc: Cyril Chemparathy <cyril@ti.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/net/davinci_mdio.c | 5 +++++ 1 file changed, 5 insertions(+)
--- a/drivers/net/davinci_mdio.c +++ b/drivers/net/davinci_mdio.c @@ -181,6 +181,11 @@ static inline int wait_for_user_access(s __davinci_mdio_reset(data); return -EAGAIN; } + + reg = __raw_readl(®s->user[0].access); + if ((reg & USERACCESS_GO) == 0) + return 0; + dev_err(data->dev, "timed out waiting for user access\n"); return -ETIMEDOUT; }
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