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Sun, 23 Aug 2026 10:59:06 -0700 (PDT) Received: from [127.0.1.1] ([2001:4bb8:148:9afb:38d7:b606:f380:289e]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-6a59e199cb8sm4153933a12.16.2026.08.23.10.59.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 23 Aug 2026 10:59:06 -0700 (PDT) From: Javier Carrasco Subject: [PATCH v2 0/4] hwmon: chipcap2: various bug fixes Date: Sun, 23 Aug 2026 19:59:00 +0200 Message-Id: <20260823-chipcap2_locks-v2-0-6a26c8e9e2fc@gmail.com> Precedence: bulk X-Mailing-List: linux-hwmon@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIAOU0i2oC/13MwQrCMAzG8VcZOVtpo8jw5HvIkCzrtuC2lnYUZ fTdrQMvktM/8P02iDaIjXCtNgg2SRS3lMBDBTzSMlglXWlAjRddo1Y8imfy+JgcP6NibbQ5EZ5 JM5SRD7aX1w7em9KjxNWF9+4n8/3+KPNPJaPKdTUztT2bFm/DTDId2c3Q5Jw/EOXfl6wAAAA= To: Guenter Roeck Cc: linux-hwmon@vger.kernel.org, linux-kernel@vger.kernel.org, Javier Carrasco , stable@vger.kernel.org X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1787507945; l=1997; i=javier.carrasco.cruz@gmail.com; s=20260111; h=from:subject:message-id; bh=3TgrgwT+3TQqyh+mokvZkeL6QOBygWorjWWJ1gx7cXM=; b=v35qConihnxbkJFI9UxHBD/4b0tniOfkuY1qF5kSgsZf29DXLkxUzuJFir5ip/dcNME8F5ppn Fj87w4pVmTPDd6974UKZ/s0QvnFlMwfbdd0uFEjXMC0S67OzcRpP5pz X-Developer-Key: i=javier.carrasco.cruz@gmail.com; a=ed25519; pk=Lge8w8xidNSf/INy7JAIbAW+Hezkp3nsBh2OjKL7lLU= The original issue (race condition for the alarms) was found by Sashiko[1] when an unrelated patch affected chipcap2.c. The issue is real as the access to the variables is not protected by any locking mechanism although 2 different sources (threaded interrupts and sysfs) could modify them. After sending the fix, Sashiko found new issues[2] that have been added to the series: - Wrong channel number in hwmon_notify_event(): pass 0 as the channel number. - IRQ teardown ordering: split the current implementation to provide the available interrupts before registering the hwmon device, and register the IRQs after the hwmon device has been registered. - Enable IRQ processing when the regulator is already enabled. The fixes have been validated on real hardware with an Amphenol ChipCap 2 CC2D23S sensor. [1] Link: https://lore.kernel.org/linux-hwmon/20260625162114.417EA1F000E9@smtp.kernel.org/ [2] Link: https://lore.kernel.org/linux-hwmon/20260821093706.D1EB11F000E9@smtp.kernel.org/ To: Guenter Roeck Cc: linux-hwmon@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Javier Carrasco Changes in v2: - Add fixes to the new issues reported by Sashiko. - Use hwmon subsystem lock. - Link to v1: https://lore.kernel.org/r/20260821-chipcap2_locks-v1-1-1d8ccabfc1b2@gmail.com --- Javier Carrasco (4): hwmon: chipcap2: fix channels in humidity alarm notifications hwmon: chipcap2: fix IRQ teardown ordering hwmon: chipcap2: enable IRQ processing when regulator is already enabled hwmon: chipcap2: serialize access to low/high_alarm indicators drivers/hwmon/chipcap2.c | 76 ++++++++++++++++++++++++------------------------ 1 file changed, 38 insertions(+), 38 deletions(-) --- base-commit: 388b607d107c07aaade04c7f22f344cab6bdccd3 change-id: 20260820-chipcap2_locks-c01013a24a0c Best regards, -- Javier Carrasco