mtip32xx: minor performance tweak

When checking for command completions if the register value is zero, proceed
to next register.

Signed-off-by: Asai Thambi S P <asamymuthupa@micron.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/drivers/block/mtip32xx/mtip32xx.c b/drivers/block/mtip32xx/mtip32xx.c
index cd271d5..2973531 100644 (file)
--- a/drivers/block/mtip32xx/mtip32xx.c
+++ b/drivers/block/mtip32xx/mtip32xx.c
@@ -970,6 +970,8 @@ static inline void mtip_process_sdbf(struct driver_data *dd)
        /* walk all bits in all slot groups */
        for (group = 0; group < dd->slot_groups; group++) {
                completed = readl(port->completed[group]);
+               if (!completed)
+                       continue;
 
                /* clear completed status register in the hardware.*/
                writel(completed, port->completed[group]);