Messages in this thread | | | Date | Thu, 22 Mar 2018 15:47:16 +0100 | From | Andrew Lunn <> | Subject | Re: [RFC PATCH 1/5] net: macb: Check MDIO state before read/write and use timeouts |
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On Thu, Mar 22, 2018 at 07:21:36PM +0530, harinikatakamlinux@gmail.com wrote: > From: Harini Katakam <harinik@xilinx.com> > > Replace the while loop in MDIO read/write functions with a timeout. > In addition, add a check for MDIO bus busy before initiating a new > operation as well to make sure there is no ongoing MDIO operation. > > Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com> > Signed-off-by: Harini Katakam <harinik@xilinx.com> > --- > drivers/net/ethernet/cadence/macb_main.c | 54 ++++++++++++++++++++++++++++++-- > 1 file changed, 52 insertions(+), 2 deletions(-) > > diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c > index d09bd43..f4030c1 100644 > --- a/drivers/net/ethernet/cadence/macb_main.c > +++ b/drivers/net/ethernet/cadence/macb_main.c > @@ -321,6 +321,21 @@ static int macb_mdio_read(struct mii_bus *bus, int mii_id, int regnum) > { > struct macb *bp = bus->priv; > int value; > + ulong timeout; > + > + timeout = jiffies + msecs_to_jiffies(1000); > + /* wait for end of transfer */ > + do { > + if (MACB_BFEXT(IDLE, macb_readl(bp, NSR))) > + break; > + > + cpu_relax(); > + } while (!time_after_eq(jiffies, timeout)); > + > + if (time_after_eq(jiffies, timeout)) { > + netdev_err(bp->dev, "wait for end of transfer timed out\n"); > + return -ETIMEDOUT; > + }
Hi Harini
It looks like you have repeated the same code 4 times. Please move it into a helper function.
Andrew
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