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Tue, 03 Nov 2026 13:50:49 -0800 (PST) Received: from eldorado ([2600:8802:b00:1f88::287]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-1b245c1c272sm1583934c88.8.2026.11.03.13.50.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 03 Nov 2026 13:50:49 -0800 (PST) From: Florian Fainelli To: linux-mips@vger.kernel.org Cc: macro@orcam.me.uk, Florian Fainelli , Thomas Bogendoerfer , Thomas Gleixner , linux-kernel@vger.kernel.org (open list) Subject: [PATCH] MIPS: SB1250: Validate and update IRQ affinity Date: Tue, 3 Nov 2026 13:50:40 -0800 Message-ID: <20261103215043.1190947-1-f.fainelli@gmail.com> X-Mailer: git-send-email 2.53.0 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit sb1250_set_affinity() selects the first online CPU in the requested affinity mask without checking whether such a CPU exists. If the intersection is empty, the resulting CPU index is invalid and must not be passed to cpu_logical_map(). Reject affinity masks containing no online CPU with -EINVAL before accessing the CPU mapping or interrupt mapper registers. Also update the effective affinity mask to reflect the single logical CPU selected as the interrupt target. Fixes: 421d1563c662 ("mips: Validate online cpus in irq_set_affinity() callbacks") Signed-off-by: Florian Fainelli --- arch/mips/sibyte/sb1250/irq.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/mips/sibyte/sb1250/irq.c b/arch/mips/sibyte/sb1250/irq.c index 2f08ad267a11..d7a656cd7ec0 100644 --- a/arch/mips/sibyte/sb1250/irq.c +++ b/arch/mips/sibyte/sb1250/irq.c @@ -76,6 +76,8 @@ static int sb1250_set_affinity(struct irq_data *d, const struct cpumask *mask, unsigned long flags; i = cpumask_first_and(mask, cpu_online_mask); + if (i >= nr_cpu_ids) + return -EINVAL; /* Convert logical CPU to physical CPU */ cpu = cpu_logical_map(i); @@ -103,6 +105,7 @@ static int sb1250_set_affinity(struct irq_data *d, const struct cpumask *mask, ____raw_writeq(cur_ints, IOADDR(A_IMR_MAPPER(cpu) + R_IMR_INTERRUPT_MASK)); } + irq_data_update_effective_affinity(d, cpumask_of(i)); raw_spin_unlock_irqrestore(&sb1250_imr_lock, flags); return 0; -- 2.53.0