linux-kernel - [PATCH] lightnvm: pblk: remove redundant check on read path

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Message-Id: <1505478953-16915-3-git-send-email-javier@cnexlabs.com>
Date:   Fri, 15 Sep 2017 14:35:50 +0200
From:   "Javier González" <jg@...htnvm.io>
To:     linux-block@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Javier González <javier@...xlabs.com>
Subject: [PATCH] lightnvm: pblk: remove redundant check on read path

A partial read I/O in pblk is an I/O where some sectors reside in the
write buffer in main memory and some are persisted on the device. Such
an I/O must at least contain 2 lbas, therefore checking for the case
where a single lba is mapped is not necessary.

Signed-off-by: Javier González <javier@...xlabs.com>
---
 drivers/lightnvm/pblk-read.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/lightnvm/pblk-read.c b/drivers/lightnvm/pblk-read.c
index 402f8eff6a2e..71c58503f1a4 100644
--- a/drivers/lightnvm/pblk-read.c
+++ b/drivers/lightnvm/pblk-read.c
@@ -235,7 +235,7 @@ static int pblk_fill_partial_read_bio(struct pblk *pblk, struct nvm_rq *rqd,
 	rqd->end_io = pblk_end_io_sync;
 	rqd->private = &wait;
 
-	if (unlikely(nr_secs > 1 && nr_holes == 1)) {
+	if (unlikely(nr_holes == 1)) {
 		ppa_ptr = rqd->ppa_list;
 		dma_ppa_list = rqd->dma_ppa_list;
 		rqd->ppa_addr = rqd->ppa_list[0];
@@ -260,7 +260,7 @@ static int pblk_fill_partial_read_bio(struct pblk *pblk, struct nvm_rq *rqd,
 #endif
 	}
 
-	if (unlikely(nr_secs > 1 && nr_holes == 1)) {
+	if (unlikely(nr_holes == 1)) {
 		struct ppa_addr ppa;
 
 		ppa = rqd->ppa_addr;
-- 
2.7.4