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AFNElJ9DbQkZZOzlR9ZgsL344ftJ3HbKwfWsxHVN1a+tLU/HgAIt5BcKOVzWRcjPdqynKK9OpHhucsn+n5n6@vger.kernel.org X-Gm-Message-State: AOJu0YyOdWGhoxpgHYrvA8ajhbjL0DUWcLbeVhGsRipkHtrrnAa9YEv5 /khd5SvB/M0NR1bfDSoJNz41RtM5HeKlybUz2eUjggraJCcRk9bqoJKQokHIBCRVfZel1Go/U8m UH5gGMq8QuUKlcHgN58P3Vvx70A== X-Received: from pllj9.prod.google.com ([2002:a17:902:7589:b0:2b2:5092:b66e]) (user=joonwonkang job=prod-delivery.src-stubby-dispatcher) by 2002:a17:903:13ce:b0:2bc:7d5d:e2b7 with SMTP id d9443c01a7336-2bc7d5de4ffmr45251655ad.36.1778392241199; Sat, 09 May 2026 22:50:41 -0700 (PDT) Date: Sun, 10 May 2026 05:50:39 +0000 In-Reply-To: <20260509015927.agent5-0002@kernel.org> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260509015927.agent5-0002@kernel.org> X-Mailer: git-send-email 2.54.0.563.g4f69b47b94-goog Message-ID: <20260510055039.793085-1-joonwonkang@google.com> Subject: Re: [PATCH 6.18.y] mailbox: Fix NULL message support in mbox_send_message() From: Joonwon Kang To: sashal@kernel.org Cc: dianders@chromium.org, jassisinghbrar@gmail.com, jonathanh@nvidia.com, joonwonkang@google.com, linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, linux-tegra@vger.kernel.org, stable@vger.kernel.org, sudeep.holla@arm.com, thierry.reding@gmail.com Content-Type: text/plain; charset="UTF-8" > On Thu, May 07, 2026 at 06:21:07AM +0000, Joonwon Kang wrote: > > diff --git a/drivers/mailbox/pcc.c b/drivers/mailbox/pcc.c > > index ff292b9e0be9..7a2baeca2ba4 100644 > > --- a/drivers/mailbox/pcc.c > > +++ b/drivers/mailbox/pcc.c > > @@ -361,7 +361,7 @@ static irqreturn_t pcc_mbox_irq(int irq, void *p) > > if (pchan->chan.rx_alloc) > > handle = write_response(pchan); > > > > - if (chan->active_req) { > > + if (chan->active_req != MBOX_NO_MSG) { > > pcc_header = chan->active_req; > > if (pcc_header->flags & PCC_CMD_COMPLETION_NOTIFY) > > mbox_chan_txdone(chan, 0); > > This pcc.c hunk does not apply on 6.18.y: commit 5378bdf6a611 ("mailbox/pcc: > support mailbox management of the shared buffer") was reverted upstream by > f82c3e62b6b8, and that revert is already queued in 6.18 as 2cafad617431. > write_response() and the active_req-driven txdone path no longer exist in > pcc_mbox_irq() on 6.18, so this hunk is both syntactically inapplicable and > semantically unnecessary. > Indeed. Thanks for letting me know of this. My local environment was quite a bit behind the latest. > Could you send a v2 omitting the pcc.c hunk? The other three hunks > (mailbox.c, tegra-hsp.c, mailbox_controller.h) apply cleanly and I'm > happy to queue those for 6.18.y. Sure, I will send a new version. Thanks, Joonwon Kang