From nobody Mon May 25 08:11:31 2026 Received: from mail-wm1-f52.google.com (mail-wm1-f52.google.com [209.85.128.52]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 63809275B03 for ; Sat, 16 May 2026 15:18:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.52 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778944701; cv=none; b=HN9kP25y+3MKfJXaZYnFHCyEbVOj0cdbZVMqmn1u3IxnLi+SJgzwMta/ZEg1z4ZtxdRVHgiWz4VNoNibeQDpGynqZzKE64YzNM1FP1q5HNl+8cKI/004uDOMCLDhDOZTz1Iv2LkIBcKpV0D7WyVoxJOrzicRxW/7WFUEh2i/HKo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778944701; c=relaxed/simple; bh=5xCqo/NLI84yXmyv/8tPF56CFvUg9eOOUrmBLI7ZpEg=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=TvhTdRSXhDypjoQH/Dz5H8kWXY26TJcQaTW1ekhH7bJGh/WJCQPN1oFhk/D8kgvtKiiT81wTIDLFbt+RtsmT2avaK5SFW1yHzBUujbaqquy6xrNsXh3oOAqA86DOuErm44zy+sMRnOhRxO4lqtXXv9YY6HYImzs2JmewcjcXbsw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=YQjgX3w3; arc=none smtp.client-ip=209.85.128.52 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="YQjgX3w3" Received: by mail-wm1-f52.google.com with SMTP id 5b1f17b1804b1-488a8f97f6bso1716095e9.2 for ; Sat, 16 May 2026 08:18:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1778944699; x=1779549499; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=GpoxQ6kC4ane6XwRPu1EFSN8ZEDWzHnTSyZhyFmWQ7k=; b=YQjgX3w3x7Atm4v/9f92wpl82jVaBcJbRVmqao3NlWnYhWHM5X1Gfb9ENP100HDLNS JlQtZWbn0txD29mUWEivzcQxuwJDBl41mNN0oH+wop71tKRgO+LTyiJFpjziDXsVyekb dQk+MBDYgBPGYEl1+n4XT7eaWUo4IewL8pFozUtUTY953mfF9uK2aJenOA7eT6rbkLgc cEFf9qZ7i1egssKSKDyI1Id7O5jTpMLwKoCDcmwALeYFy9CVFZgmkM179BF0bWzfxZH6 JdV16AO0xD3gqUCgerzg67KIjqNBmNDRWVfs8qgHe5j29mxdY+EO+0N3GKZBtDQOTzJm rc1g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1778944699; x=1779549499; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=GpoxQ6kC4ane6XwRPu1EFSN8ZEDWzHnTSyZhyFmWQ7k=; b=QAWvvc3q4veKkbMlqJgryaTRueYJ5/UPdpsz1jpEsKm9T9O7weB5yO7SEnIugV3loj u9C1EgsyUWSg0RemAchlR8LX5MkGggXbY5WgU5wDYhi5gMLHA0vGuaFNfaSXlIWQSilL y2wCnAJbPKtCpmVKLt2j0+C6ACy5ohDGaBN9VMM54QHr7K99hKWyWlFJ7RoFRhXq+Qgu xUtXPaDzE699AMsTX7hMyEZmeIetjpeKltwYWY7COTJzstb5MeJhL8K61/EklRTOo0Uk OQyq64hxpjwyyUxf+M0j2YArfGy7hPF0p5qy7jksl6FPk2KCt0fXkLlmyNbNiJlEK+jS xGww== X-Forwarded-Encrypted: i=1; AFNElJ8BL9IsNhrDCyHADtVl2uxAFINd/0b+8grJDGvDwSx6ZNWGT14DjaNGMTQRjVbjxL36uItlyAjoDFjFVW4=@vger.kernel.org X-Gm-Message-State: AOJu0Yzkd1WNjRH6+iQWIAWrD+QjsfI9xr359mBAbDZnaqRj5XyxbEBA CDWGROMhD7E4IY+LCFpQCdUnoJPoavHurKi0E1EP2x7DAcn+rkxWw3bN X-Gm-Gg: Acq92OHVi0U5dXb4iFy5J3TzdxeFb5v2relwfugna0H7LcYR+PJWxP89bDT/yQXZBCZ NziPss9/ai2ZW8A0vdDHageFE05JWGTwDbOcmhsIJUDBPQ5aMis8/WpsSi1WNsTndDHMJBCSlEW 5qUbPeQFNTFGQ5SNHj1DQ5JbvpntNNPribCVbbaamEKjDbOHSg1ULbi99lSsBrbCncqhhrmAPDp RgTk0KqbDliBjiIEzJcAJAPOAlP5ped8r68zLxt9kgk0ahOEuq9VLXuIfgu5ualSGqtr6w+cRnP Lt2TSphPqwIFJk9hALe71prbvUazLARLxF8gFIRlmZLProYvXhW96LUCipgudN8PjJIaQP3Ehpn IRirBrel0cggmCRyp25buLLhaORr6voHRIp0yw98tJ7zAGrj6SepOwO5NjmIoxyKlVnhn12aUqW pA/MfUmglcBuP6AqQbpvr9C6sz9mnf5ngMvsKf0Z60i9oyTA== X-Received: by 2002:a05:600c:45c3:b0:48a:797f:24f8 with SMTP id 5b1f17b1804b1-48fe59ab0e7mr55061735e9.0.1778944698581; Sat, 16 May 2026 08:18:18 -0700 (PDT) Received: from localhost.localdomain ([185.139.138.68]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48feab2a23dsm39712915e9.5.2026.05.16.08.18.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 16 May 2026 08:18:18 -0700 (PDT) From: Stepan Ionichev To: jic23@kernel.org Cc: lars@metafoo.de, Michael.Hennerich@analog.com, dlechner@baylibre.com, nuno.sa@analog.com, andy@kernel.org, linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, sozdayvek@gmail.com Subject: [PATCH] iio: resolver: ad2s1210: split trigger handler body into a helper Date: Sat, 16 May 2026 20:17:20 +0500 Message-Id: <20260516151721.1982-1-sozdayvek@gmail.com> X-Mailer: git-send-email 2.33.0.windows.2 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" ad2s1210_trigger_handler() takes st->lock via guard(mutex), then runs the per-channel read/event/push sequence, and finally calls iio_trigger_notify_done() before returning IRQ_HANDLED. Because the guard releases at scope exit, iio_trigger_notify_done() runs with st->lock still held. The previous "goto error_ret" structure also hides that the locked region extends all the way to notify_done. The device does not register any triggers itself, so this is not a deadlock source today, but holding a device mutex across the trigger notification path is fragile if a trigger ever gets attached elsewhere. Lift the body of the handler into a helper, ad2s1210_collect_and_push(), that owns the guard and returns 0 / negative errno via direct returns instead of "goto error_ret". The irq handler then becomes a short wrapper that calls the helper, calls iio_trigger_notify_done() with no state lock held, and returns IRQ_HANDLED. No change in behaviour for the read paths: every error path still skips the event/buffer push, and iio_trigger_notify_done() is still called on every IRQ regardless of result. The fault-register read no longer leaks a negative errno into irqreturn_t either, since the caller never propagates the helper's return value. Suggested-by: Jonathan Cameron Link: https://lore.kernel.org/lkml/20260516122838.163a77d3@jic23-huawei/ Signed-off-by: Stepan Ionichev --- drivers/iio/resolver/ad2s1210.c | 33 ++++++++++++++++++++------------- 1 file changed, 20 insertions(+), 13 deletions(-) diff --git a/drivers/iio/resolver/ad2s1210.c b/drivers/iio/resolver/ad2s121= 0.c index 1be19fe8a..20b0b2b5c 100644 --- a/drivers/iio/resolver/ad2s1210.c +++ b/drivers/iio/resolver/ad2s1210.c @@ -1276,10 +1276,8 @@ static int ad2s1210_debugfs_reg_access(struct iio_de= v *indio_dev, return regmap_write(st->regmap, reg, writeval); } =20 -static irqreturn_t ad2s1210_trigger_handler(int irq, void *p) +static int ad2s1210_collect_and_push(struct iio_dev *indio_dev, s64 timest= amp) { - struct iio_poll_func *pf =3D p; - struct iio_dev *indio_dev =3D pf->indio_dev; struct ad2s1210_state *st =3D iio_priv(indio_dev); size_t chan =3D 0; int ret; @@ -1295,15 +1293,15 @@ static irqreturn_t ad2s1210_trigger_handler(int irq= , void *p) AD2S1210_REG_POSITION_MSB, &st->sample.raw, 2); if (ret < 0) - goto error_ret; + return ret; } else { ret =3D ad2s1210_set_mode(st, MOD_POS); if (ret < 0) - goto error_ret; + return ret; =20 ret =3D spi_read(st->sdev, &st->sample, 3); if (ret < 0) - goto error_ret; + return ret; } =20 memcpy(&st->scan.chan[chan++], &st->sample.raw, 2); @@ -1315,15 +1313,15 @@ static irqreturn_t ad2s1210_trigger_handler(int irq= , void *p) AD2S1210_REG_VELOCITY_MSB, &st->sample.raw, 2); if (ret < 0) - goto error_ret; + return ret; } else { ret =3D ad2s1210_set_mode(st, MOD_VEL); if (ret < 0) - goto error_ret; + return ret; =20 ret =3D spi_read(st->sdev, &st->sample, 3); if (ret < 0) - goto error_ret; + return ret; } =20 memcpy(&st->scan.chan[chan++], &st->sample.raw, 2); @@ -1334,16 +1332,25 @@ static irqreturn_t ad2s1210_trigger_handler(int irq= , void *p) =20 ret =3D regmap_read(st->regmap, AD2S1210_REG_FAULT, ®_val); if (ret < 0) - goto error_ret; + return ret; =20 st->sample.fault =3D reg_val; } =20 - ad2s1210_push_events(indio_dev, st->sample.fault, pf->timestamp); + ad2s1210_push_events(indio_dev, st->sample.fault, timestamp); iio_push_to_buffers_with_ts(indio_dev, &st->scan, sizeof(st->scan), - pf->timestamp); + timestamp); + + return 0; +} + +static irqreturn_t ad2s1210_trigger_handler(int irq, void *p) +{ + struct iio_poll_func *pf =3D p; + struct iio_dev *indio_dev =3D pf->indio_dev; + + ad2s1210_collect_and_push(indio_dev, pf->timestamp); =20 -error_ret: iio_trigger_notify_done(indio_dev->trig); =20 return IRQ_HANDLED; --=20 2.43.0