From: Arnd Bergmann <arnd@arndb.de>
Date: Tue, 15 Mar 2016 21:40:31 +0000 (+0100)
Subject: qla2xxx: avoid maybe_uninitialized warning
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=bc7095a926b3148bdfc8b282474002abbda0f6b5;p=openwrt%2Fstaging%2Fblogic.git

qla2xxx: avoid maybe_uninitialized warning

The qlt_check_reserve_free_req() function produces an incorrect warning
when CONFIG_PROFILE_ANNOTATED_BRANCHES is set:

drivers/scsi/qla2xxx/qla_target.c: In function 'qlt_check_reserve_free_req':
drivers/scsi/qla2xxx/qla_target.c:1887:3: error: 'cnt_in' may be used uninitialized in this function [-Werror=maybe-uninitialized]
   ql_dbg(ql_dbg_io, vha, 0x305a,
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
       "qla_target(%d): There is no room in the request ring: vha->req->ring_index=%d, vha->req->cnt=%d, req_cnt=%d Req-out=%d Req-in=%d Req-Length=%d\n",
       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
       vha->vp_idx, vha->req->ring_index,
       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
       vha->req->cnt, req_cnt, cnt, cnt_in, vha->req->length);
       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/scsi/qla2xxx/qla_target.c:1887:3: error: 'cnt' may be used uninitialized in this function [-Werror=maybe-uninitialized]

The problem is that gcc fails to track the state of the condition across
an annotated branch.

This slightly rearranges the code to move the second if() block
into the first one, to avoid the warning while retaining the
behavior of the code.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-By: Himanshu Madhani <himanshu.madhani@qlogic.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
---

diff --git a/drivers/scsi/qla2xxx/qla_target.c b/drivers/scsi/qla2xxx/qla_target.c
index ee967becd257..124e8de290b3 100644
--- a/drivers/scsi/qla2xxx/qla_target.c
+++ b/drivers/scsi/qla2xxx/qla_target.c
@@ -1872,15 +1872,17 @@ static int qlt_check_reserve_free_req(struct scsi_qla_host *vha,
 		else
 			vha->req->cnt = vha->req->length -
 			    (vha->req->ring_index - cnt);
-	}
 
-	if (unlikely(vha->req->cnt < (req_cnt + 2))) {
-		ql_dbg(ql_dbg_io, vha, 0x305a,
-		    "qla_target(%d): There is no room in the request ring: vha->req->ring_index=%d, vha->req->cnt=%d, req_cnt=%d Req-out=%d Req-in=%d Req-Length=%d\n",
-		    vha->vp_idx, vha->req->ring_index,
-		    vha->req->cnt, req_cnt, cnt, cnt_in, vha->req->length);
-		return -EAGAIN;
+		if (unlikely(vha->req->cnt < (req_cnt + 2))) {
+			ql_dbg(ql_dbg_io, vha, 0x305a,
+			    "qla_target(%d): There is no room in the request ring: vha->req->ring_index=%d, vha->req->cnt=%d, req_cnt=%d Req-out=%d Req-in=%d Req-Length=%d\n",
+			    vha->vp_idx, vha->req->ring_index,
+			    vha->req->cnt, req_cnt, cnt, cnt_in,
+			    vha->req->length);
+			return -EAGAIN;
+		}
 	}
+
 	vha->req->cnt -= req_cnt;
 
 	return 0;