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

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Date:   Wed, 18 Jul 2018 11:08:41 -0600
From:   Lina Iyer <ilina@...eaurora.org>
To:     Raju P L S S S N <rplsssn@...eaurora.org>
Cc:     andy.gross@...aro.org, david.brown@...aro.org,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        rnayak@...eaurora.org, bjorn.andersson@...aro.org,
        linux-kernel@...r.kernel.org, sboyd@...nel.org,
        evgreen@...omium.org, dianders@...omium.org, mka@...omium.org
Subject: Re: [PATCH] drivers: qcom: rpmh: fix unwanted error check for
 get_tcs_of_type()

On Fri, Jul 13 2018 at 07:46 -0600, Raju P L S S S N wrote:
>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>
Reviewed-by: Lina Iyer <ilina@...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);
>--
>The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,\na Linux Foundation Collaborative Project
>