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Sun, 27 Sep 2026 04:56:36 -0700 (PDT) Received: from serhat-ubuntu.home ([212.253.192.148]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-4887a64ed6esm21926084f8f.29.2026.09.27.04.56.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 27 Sep 2026 04:56:35 -0700 (PDT) From: Serhat Kumral To: Bernard Metzler , Jason Gunthorpe , Leon Romanovsky Cc: linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org, Serhat Kumral Subject: [PATCH] RDMA/siw: Fix length of first chunk in siw_try_1seg() Date: Sun, 27 Sep 2026 14:53:51 +0300 Message-ID: <20260927115351.12245-1-serhatkumral1@gmail.com> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit When a short-single SGE payload crosses a page boundary, siw_try_1seg() computes the length of the first chunk as the amount that spills into the second page instead of the amount left in the first page part = bytes - (PAGE_SIZE - off); Use the remaining length of the first page as the first chunk. Fixes: b9be6f18cf9e ("rdma/siw: transmit path") Assisted-by: LLM Signed-off-by: Serhat Kumral --- drivers/infiniband/sw/siw/siw_qp_tx.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/infiniband/sw/siw/siw_qp_tx.c b/drivers/infiniband/sw/siw/siw_qp_tx.c index f7dd32c6e5ba..54c9d97015e8 100644 --- a/drivers/infiniband/sw/siw/siw_qp_tx.c +++ b/drivers/infiniband/sw/siw/siw_qp_tx.c @@ -85,7 +85,7 @@ static int siw_try_1seg(struct siw_iwarp_tx *c_tx, void *paddr) if (likely(PAGE_SIZE - off >= bytes)) { memcpy(paddr, buffer + off, bytes); } else { - unsigned long part = bytes - (PAGE_SIZE - off); + unsigned long part = PAGE_SIZE - off; memcpy(paddr, buffer + off, part); kunmap_local(buffer); -- 2.53.0