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Mon, 31 Aug 2026 17:29:46 -0700 (PDT) Received: from 4470NRD-ASU.ssi.samsung.com ([50.205.20.42]) by smtp.gmail.com with ESMTPSA id 00721157ae682-85e668ce7ecsm63349177b3.34.2026.08.31.17.29.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 31 Aug 2026 17:29:45 -0700 (PDT) From: Anisa Su X-Google-Original-From: Anisa Su To: linux-cxl@vger.kernel.org Cc: benjamin.cheatham@amd.com, icheng@nvidia.com, dave@stgolabs.net, dave.jiang@intel.com, alison.schofield@intel.com, jic23@kernel.org, Anisa Su Subject: [PATCH v2 4/4] cxl/events: Return IRQ_NONE when no events were processed Date: Mon, 31 Aug 2026 17:26:57 -0700 Message-ID: <20260901002912.958-5-anisa.su@samsung.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260901002912.958-1-anisa.su@samsung.com> References: <20260901002912.958-1-anisa.su@samsung.com> Precedence: bulk X-Mailing-List: linux-cxl@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit cxl_event_thread() returns IRQ_HANDLED whether or not it found anything to do. Claiming every interrupt as handled means a device flooding its MSI vector is never detected. Return IRQ_NONE unless the Event Status register names a log to drain. Fixes: a49aa8141b65 ("cxl/mem: Wire up event interrupts") Signed-off-by: Anisa Su --- drivers/cxl/pci.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/cxl/pci.c b/drivers/cxl/pci.c index 239df18c9c87..94ff2b7d1f09 100644 --- a/drivers/cxl/pci.c +++ b/drivers/cxl/pci.c @@ -528,6 +528,7 @@ static irqreturn_t cxl_event_thread(int irq, void *id) struct cxl_memdev_state *mds = to_cxl_memdev_state(cxlds); u32 mask = CXLDEV_EVENT_STATUS_ALL; int attempts = CXL_EVENT_DRAIN_ATTEMPTS; + bool handled = false; while (mask) { u32 status, drained, stuck; @@ -542,6 +543,7 @@ static irqreturn_t cxl_event_thread(int irq, void *id) status &= mask; if (!status) break; + handled = true; rc = cxl_mem_get_event_records(mds, status, &drained); if (rc) { @@ -579,7 +581,7 @@ static irqreturn_t cxl_event_thread(int irq, void *id) cond_resched(); } - return IRQ_HANDLED; + return handled ? IRQ_HANDLED : IRQ_NONE; } static int cxl_event_req_irq(struct cxl_dev_state *cxlds, u8 setting) -- 2.43.0