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Tue, 3 Mar 2026 13:49:45 +0000 (GMT) Date: Tue, 3 Mar 2026 19:19:43 +0530 From: Mahesh J Salgaonkar To: Nam Cao Cc: Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Nilay Shroff , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: Re: [PATCH] powerpc/pseries: Correct MSI allocation tracking Message-ID: Reply-To: mahesh@linux.ibm.com References: <20260302003948.1452016-1-namcao@linutronix.de> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260302003948.1452016-1-namcao@linutronix.de> X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzAzMDEwOCBTYWx0ZWRfX59b61R1itBWJ Rxpso5b+0OJZungNvbhBV4onTYBMe+4qeDEDOqVVHAp/uwqAME2zKnU3AF1vETHjH1/4PlPVavf Ga3Bt2sAJ+ZMozpSk+8EeNl1iYLrXrYrau1kmPrFG+jfoWLdFPOVngxup3juBE3k4e6vRIiCzyX uT3e1ms3qwY+wZzFi/FcTkLP2Hagf3YdRx7AbCfvOSFbsRXujrgv1VGU0Yrqp1+SKaJaLPdB4j8 K9d3gXSD14MTtevu/vbkn8iB1QXEoP85avh5AD6OtFDpH9HTvzJswOY1Nhde4ryUbq8L7rGaPE4 Y1oLAKvKAHCrYi5kQjYYyJY6813rfjkg6slNYGtN7BoVWbyGeeYS+d3UMRBiN3ooSO0m75WLt1K jfGU5ExIgAfVat1R8f0BUP4ZspTx58K85w+H9QwIJnrRZzGgXv7kHxpByv0JoKHfLho9lxbdFMf vsU495rsqObAxSQGAvA== X-Proofpoint-ORIG-GUID: wdaNAXr0V-udE02jb_k--k8s7YfGLu7h X-Proofpoint-GUID: pqrVKaEsROHD71BvKXjX-paaCxtw4-LW X-Authority-Analysis: v=2.4 cv=AobjHe9P c=1 sm=1 tr=0 ts=69a6e701 cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=kj9zAlcOel0A:10 a=Yq5XynenixoA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=RzCfie-kr_QcCd8fBx8p:22 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8 a=LPlfM72s0PfGJSQ53tEA:9 a=CjuIK1q_8ugA:10 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-03-02_05,2026-03-03_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 lowpriorityscore=0 bulkscore=0 impostorscore=0 malwarescore=0 spamscore=0 clxscore=1011 suspectscore=0 adultscore=0 priorityscore=1501 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2602130000 definitions=main-2603030108 On 2026-03-02 01:39:48 Mon, Nam Cao wrote: > The per-device MSI allocation calculation in pseries_irq_domain_alloc() > is clearly wrong. It can still happen to work when nr_irqs is 1. > > Correct it. > > Fixes: c0215e2d72de ("powerpc/pseries: Fix MSI-X allocation failure when quota is exceeded") > Cc: stable@vger.kernel.org > Signed-off-by: Nam Cao > --- > arch/powerpc/platforms/pseries/msi.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/powerpc/platforms/pseries/msi.c b/arch/powerpc/platforms/pseries/msi.c > index 64ffc6476ad6..8285b9a29fbf 100644 > --- a/arch/powerpc/platforms/pseries/msi.c > +++ b/arch/powerpc/platforms/pseries/msi.c > @@ -605,7 +605,7 @@ static int pseries_irq_domain_alloc(struct irq_domain *domain, unsigned int virq > &pseries_msi_irq_chip, pseries_dev); > } > > - pseries_dev->msi_used++; > + pseries_dev->msi_used += nr_irqs; Yeah, msi_used was wronlgy incremented only once while allocating nr_irqs interrupts from parent domain. Looks good to me. Reviewed-by: Mahesh Salgaonkar Thanks, -Mahesh. > return 0; > > out: > -- > 2.47.3 > -- Mahesh J Salgaonkar