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Wed, 09 Sep 2026 16:49:26 -0700 (PDT) Received: from ryzen.lan ([2601:644:8000:7a86::e35]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-39d7e3f5f1esm581449a91.1.2026.09.09.16.49.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 09 Sep 2026 16:49:25 -0700 (PDT) From: Rosen Penev To: dmaengine@vger.kernel.org Cc: Vinod Koul , Frank Li , Stefan Roese , linux-kernel@vger.kernel.org (open list) Subject: [PATCH] dmaengine: mv_xor: return descriptor to free pool on io_win failure Date: Wed, 9 Sep 2026 16:49:24 -0700 Message-ID: <20260909234924.103418-1-rosenp@gmail.com> X-Mailer: git-send-email 2.55.0 Precedence: bulk X-Mailing-List: dmaengine@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit When mv_xor_prep_dma_xor() allocates a descriptor slot and then mv_xor_add_io_win() fails in the source-address loop, the slot stays on the allocated list and is never reclaimed, leaking a descriptor resource. Return the slot to the free pool under the channel lock before returning NULL on failure. Fixes: 77ff7a706f01 ("mv_xor: Add support for IO (PCIe) src/dst areas") Assisted-by: opencode:big-pickle Signed-off-by: Rosen Penev --- drivers/dma/mv_xor.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/dma/mv_xor.c b/drivers/dma/mv_xor.c index 25ed61f1b089..dd4f150d5fb1 100644 --- a/drivers/dma/mv_xor.c +++ b/drivers/dma/mv_xor.c @@ -583,8 +583,13 @@ mv_xor_prep_dma_xor(struct dma_chan *chan, dma_addr_t dest, dma_addr_t *src, while (src_cnt--) { /* Check if a new window needs to get added for 'src' */ ret = mv_xor_add_io_win(mv_chan, src[src_cnt]); - if (ret) + if (ret) { + spin_lock_bh(&mv_chan->lock); + list_move_tail(&sw_desc->node, + &mv_chan->free_slots); + spin_unlock_bh(&mv_chan->lock); return NULL; + } mv_desc_set_src_addr(sw_desc, src_cnt, src[src_cnt]); } } -- 2.55.0