linux-kernel - [PATCH] drivers: qcom: rpmh: fix unwanted error check for get_tcs_of

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Date:   Fri, 13 Jul 2018 19:15:46 +0530
From:   Raju P L S S S N <rplsssn@...eaurora.org>
To:     andy.gross@...aro.org, david.brown@...aro.org,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org
Cc:     rnayak@...eaurora.org, bjorn.andersson@...aro.org,
        linux-kernel@...r.kernel.org, sboyd@...nel.org,
        evgreen@...omium.org, dianders@...omium.org, mka@...omium.org,
        ilina@...eaurora.org, "Raju P.L.S.S.S.N" <rplsssn@...eaurora.org>
Subject: [PATCH] drivers: qcom: rpmh: fix unwanted error check for get_tcs_of_type()

From: "Raju P.L.S.S.S.N" <rplsssn@...eaurora.org>

The patch fixes the bug reported by Dan Carpenter.
It removes the unnecessary err check for ‘tcs’ reported by
static checker warning:

drivers/soc/qcom/rpmh-rsc.c:111 tcs_invalidate()
warn: 'tcs' isn't an ERR_PTR
See also:
drivers/soc/qcom/rpmh-rsc.c:178 get_tcs_for_msg() warn: 'tcs' isn't
an ERR_PTR
drivers/soc/qcom/rpmh-rsc.c:180 get_tcs_for_msg() warn: 'tcs' isn't
an ERR_PTR

https://www.spinics.net/lists/linux-soc/msg04624.html

Fixes: 48dbb0f02d34 ("drivers: qcom: rpmh-rsc: allow invalidation
of sleep/wake TCS")
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Raju P.L.S.S.S.N <rplsssn@...eaurora.org>
---
 drivers/soc/qcom/rpmh-rsc.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/soc/qcom/rpmh-rsc.c b/drivers/soc/qcom/rpmh-rsc.c
index 098feb9..fefda0f 100644
--- a/drivers/soc/qcom/rpmh-rsc.c
+++ b/drivers/soc/qcom/rpmh-rsc.c
@@ -107,8 +107,6 @@ static int tcs_invalidate(struct rsc_drv *drv, int type)
 	struct tcs_group *tcs;
 
 	tcs = get_tcs_of_type(drv, type);
-	if (IS_ERR(tcs))
-		return PTR_ERR(tcs);
 
 	spin_lock(&tcs->lock);
 	if (bitmap_empty(tcs->slots, MAX_TCS_SLOTS)) {
@@ -174,9 +172,9 @@ static struct tcs_group *get_tcs_for_msg(struct rsc_drv *drv,
 	 * TCSes before making an active state request.
 	 */
 	tcs = get_tcs_of_type(drv, type);
-	if (msg->state == RPMH_ACTIVE_ONLY_STATE && IS_ERR(tcs)) {
+	if (msg->state == RPMH_ACTIVE_ONLY_STATE && !tcs->num_tcs) {
 		tcs = get_tcs_of_type(drv, WAKE_TCS);
-		if (!IS_ERR(tcs)) {
+		if (tcs->num_tcs) {
 			ret = rpmh_rsc_invalidate(drv);
 			if (ret)
 				return ERR_PTR(ret);
-- 
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