From: Asai Thambi S P <asamymuthupa@micron.com>
To: Jens Axboe <axboe@kernel.dk>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Sam Bradshaw <sbradshaw@micron.com>
Subject: [PATCH 08/11] mtip32xx: minor performance tweak
Date: Tue, 29 May 2012 18:44:01 -0700 [thread overview]
Message-ID: <4FC57B61.5020004@micron.com> (raw)
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>
---
drivers/block/mtip32xx/mtip32xx.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/drivers/block/mtip32xx/mtip32xx.c b/drivers/block/mtip32xx/mtip32xx.c
index acc1d6f..d0fa357 100644
--- 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]);
--
1.7.1
reply other threads:[~2012-05-30 1:44 UTC|newest]
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