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[31.209.40.223]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-6a38c9d5eb2sm841941a12.5.2026.08.14.06.29.21 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Fri, 14 Aug 2026 06:29:23 -0700 (PDT) From: Christian Lugnberg To: vkoul@kernel.org Cc: Frank.Li@kernel.org, wens@kernel.org, jernej.skrabec@gmail.com, samuel@sholland.org, dmaengine@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev, linux-kernel@vger.kernel.org, Christian Lugnberg Subject: [PATCH 0/2] dmaengine: sun6i: Fix two bugs in the DMA status path Date: Fri, 14 Aug 2026 15:28:28 +0200 Message-ID: <20260814132906.70322-1-christian.lugnberg@soundtrack.io> X-Mailer: git-send-email 2.54.0 Precedence: bulk X-Mailing-List: linux-sunxi@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Rspamd-Server: rspamd-worker-8404 X-Spamd-Result: default: False [0.34 / 15.00]; BAYES_HAM(-5.50)[99.99%]; RBL_SENDERSCORE(2.00)[172.234.253.10:from]; SUSPICIOUS_RECIPS(1.50)[]; DMARC_POLICY_QUARANTINE(1.50)[soundtrack.io : SPF not aligned (relaxed), No valid DKIM,quarantine]; MID_CONTAINS_FROM(1.00)[]; MAILLIST(-0.15)[generic]; BAD_REP_POLICIES(0.10)[]; MIME_GOOD(-0.10)[text/plain]; HAS_LIST_UNSUB(-0.01)[]; TAGGED_RCPT(0.00)[]; FREEMAIL_CC(0.00)[kernel.org,gmail.com,sholland.org,vger.kernel.org,lists.infradead.org,lists.linux.dev,soundtrack.io]; ARC_ALLOW(0.00)[subspace.kernel.org:s=arc-20240116:i=1]; PRECEDENCE_BULK(0.00)[]; FROM_HAS_DN(0.00)[]; RCVD_COUNT_FIVE(0.00)[6]; FROM_NEQ_ENVFROM(0.00)[christian.lugnberg@soundtrack.io,linux-sunxi@lists.linux.dev]; RCPT_COUNT_SEVEN(0.00)[10]; R_SPF_ALLOW(0.00)[+ip4:172.234.253.10]; TO_DN_SOME(0.00)[]; FORGED_SENDER_MAILLIST(0.00)[]; FORGED_RECIPIENTS_MAILLIST(0.00)[]; RCVD_TLS_LAST(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:63949, ipnet:172.234.224.0/19, country:SG]; TAGGED_FROM(0.00)[bounces-25158-noreply=patchwork.local]; RCVD_VIA_SMTP_AUTH(0.00)[] X-Rspamd-Queue-Id: D1A8D1C0126 X-MORS-Enabled: yes X-MORS-DOMAIN: patchwork.local X-MORS-HOSTING: hosting172546 X-MORS-USER: hosting172546 X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= This series fixes two bugs in the sun6i DMA driver's tx_status path. The first patch fixes a non-atomic read of DMA_CHAN_LLI_ADDR and DMA_CHAN_CUR_CNT in sun6i_get_chan_size(), introduced when cyclic DMA support was added. The race causes spurious ALSA xruns on Allwinner H3 (Barix IPAM400), confirmed by observation on kernel 6.12. The second patch fixes a null pointer dereference in sun6i_dma_tx_status() where to_sun6i_desc() was called unconditionally on the return value of vchan_find_desc() before the NULL check, present since the driver was first introduced. Both patches are candidates for stable backport. Christian Lugnberg (2): dmaengine: sun6i: fix non-atomic read of DMA position registers dmaengine: sun6i: fix null pointer dereference in sun6i_dma_tx_status drivers/dma/sun6i-dma.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-)