From nobody Tue Jun 16 11:12:24 2026 Received: from mail-qt1-f173.google.com (mail-qt1-f173.google.com [209.85.160.173]) (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 02AAE1CAA7D for ; Wed, 8 Apr 2026 05:19:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.160.173 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775625564; cv=none; b=mXHFQkHhmy2BW5ljc8d8ilK/esrswjleWu6vfn7uWpswmgHDSVNW1+C3Ig/WQRHU/b6sHLnrfN6Ew7EVOGl007WLl8cWYR0NzKTpHcLQS/VZP5aQhNzYYsJpu92Nrh1SgseGy03krtZtUtVk+dwzCqUHuGGVwo3eGJ3zq9X5WWU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775625564; c=relaxed/simple; bh=gAiqo1yEFSKZ4qMRWRKAF3hrIlPxkPVZO8mJMVl77xg=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=mYyqxb/ETT0M9fyKDiQ7FtbtKhgxvt/LaQRiiGZxXSAPRUFRlITtU/NbwhZEF+jFre4+etKvH20NQLXJ0sA+ycdFA0YDlau+Mw8S4PYZ4GnYtk2Cd8bhlWPphoW4aniBu3tBhq7m0i8OGYKkzX8pkBVyy9mH6Ya8p43zhhDc2AM= 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=L313TnGi; arc=none smtp.client-ip=209.85.160.173 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="L313TnGi" Received: by mail-qt1-f173.google.com with SMTP id d75a77b69052e-50b2ebca625so5474711cf.0 for ; Tue, 07 Apr 2026 22:19:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1775625562; x=1776230362; 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=0e6IVtq/fL2ky15iy49mcCbTc8AD9BaBUiCWPPudmx4=; b=L313TnGin1WyB3Ss2e4JCsJPRjTLzGIhKYS13ZizXSegsSUQEVq1myJ14gkJeb7avO yFb9DgiO0SEUdnksGxWArsnOq5rXBjSC0cQn1H01eNhOAl5hrs9jw/B34ReipiAVjgGK 5VLCtTWjDHE5ClbZwzv5R5XniI7LAyhYRb0yonCcRiHqF5UqnfgDq+yKGbSIV4OSVXlI yI4WeF4NXP3tVkssoMji8qCbcBSJOB+fBoi8Cdrz2/BD7GrPDpp6rG7G6juSODXRdE8v K5k7DaVERF5TZP04bSFkzpYA7l0XtofjcNyHwKfAIHhRsHZUV7fTHhqHO4fLiv01HX/n Y9nw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1775625562; x=1776230362; 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=0e6IVtq/fL2ky15iy49mcCbTc8AD9BaBUiCWPPudmx4=; b=I/elS+Jfe7RIXCTrieC+jbBJUgY/GA5OnAntgIoOMlN+LYF7i4aJiVh3GGnCn13ebS ForPlAAIXPZuWsdqVfnhVJ6lxqmXKNz3PHmQdhz/Z8DT8YaaUPEbnfxtUkfWPgbmIbk/ FHVO+1yjeY6sp1J/rjX4DfRgfpLvl7zyFXonsYQjop2yhyKSHOiHyKkUkZ9c5Qt2rnxC xm3zSjBYfK5ieYQWUJxpF3A7wlrIsowflkcKJ+jJeOplvtqDu+3TWqp9Plg5FTWd2q1e Bh9+SlbvJ0iM1VCcQkOXh63fxI1O/INTmAYho4fg0gvSeL7NQYbqhzOZ9YUfslFJ613K dNzQ== X-Forwarded-Encrypted: i=1; AJvYcCXGmBLCXQQCbrBRyB+4JtScN356b9CBtAJbQZMSWL4tsgPeq25lJSnoQABGmv8QrFvRyg4oJMh7eb8rmmA=@vger.kernel.org X-Gm-Message-State: AOJu0Yy3apk4iNlsUayfHIuUVuDWGZwKq5zzLpMI3Zlwjtf7oFPo9axN hABGtT3ufzaVN6V4irG1bF6sFFaRbWY1fY/iJwygKTjbBMgOaFXDcizA X-Gm-Gg: AeBDieswHHWBeX8rhNVuXr/As2wTCgMpownI4bLh4JcWQrFQSUdH+1KhcN9yeL49xUs ZTH1DXHTF1PIJGSLDHGwd5e1xRpHHy9qEHTd1H6JDYbHmCNvmzfnIBLcur35RRUim7MdMaAhqkF WBTOq7E19oI6l8k/xyr1EOltO/CNxecYYxL/NC9NLgX4AdHp0zMby/gKZdSUaKCPFST7f1kGYuc 1VT3cRTD04O1/CztcJhUHbql8ITgyDlEN/hX8qnuXX/3PXRDBownRua3n1/7jGihPZm3cTKN4s0 cKPNfvqIF+kRKP596FEWf8R0hhc+Wtqpn+xJL2O2+dEfWBqfiE9eSQ7Wi217T7s94++Oi0SQsuL jvU+9J4MkxBERjTHBBlIGm4rToXew6+eCtRcAr3FJehM8cyqzct/+DX5fSO2VzWGwxnSDg7uR5t XgoOiU2VO3krpCJVwPPQNslDgWhaR7DSxXSs+VNdAKzBnEbno= X-Received: by 2002:a05:622a:1a85:b0:50b:6d63:6a2b with SMTP id d75a77b69052e-50d4fa369admr283109881cf.2.1775625561886; Tue, 07 Apr 2026 22:19:21 -0700 (PDT) Received: from LAPTOP-3SN9PV9T ([42.112.110.201]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-8a5977e00b4sm162919616d6.47.2026.04.07.22.19.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 07 Apr 2026 22:19:20 -0700 (PDT) From: Thanh Nguyen To: dmitry.torokhov@gmail.com Cc: linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, linus.walleij@linaro.org, timon37@lavabit.com, Thanh Nguyen Subject: [PATCH] Input: zinitix: iterate contact slots by finger count Date: Wed, 8 Apr 2026 00:19:07 -0500 Message-ID: <20260408051907.792-1-thanhnguyxn07@gmail.com> X-Mailer: git-send-email 2.51.0.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" On affected devices (for example Samsung A3 2015), the value in touch_event.finger_mask appears to behave as a count of reported slots rather than a bitmask. Using for_each_set_bit() can then skip valid contacts and break multitouch gestures. Keep filtering by SUB_BIT_EXIST to avoid reporting shadow contacts, but iterate from slot 0 up to min(finger_mask, MAX_SUPPORTED_FINGER_NUM). This follows the maintainer feedback to treat the field as a possible count while preserving the anti-shadow check. Fixes: e941dc13fd37 ("Input: zinitix - do not report shadow fingers") Link: https://bugzilla.kernel.org/show_bug.cgi?id=3D221278 Signed-off-by: Thanh Nguyen --- v2: - Address maintainer feedback: do not revert e941dc13fd37. - Keep SUB_BIT_EXIST filtering to avoid shadow contacts. - Treat finger_mask as a slot-count bound and iterate 0..min(mask, max). drivers/input/touchscreen/zinitix.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/input/touchscreen/zinitix.c b/drivers/input/touchscree= n/zinitix.c index 716d6fa60..a2edae7df 100644 --- a/drivers/input/touchscreen/zinitix.c +++ b/drivers/input/touchscreen/zinitix.c @@ -471,7 +471,8 @@ static irqreturn_t zinitix_ts_irq_handler(int irq, void= *bt541_handler) } =20 finger_mask =3D touch_event.finger_mask; - for_each_set_bit(i, &finger_mask, MAX_SUPPORTED_FINGER_NUM) { + for (i =3D 0; i < min_t(unsigned long, finger_mask, + MAX_SUPPORTED_FINGER_NUM); i++) { const struct point_coord *p =3D &touch_event.point_coord[i]; =20 /* Only process contacts that are actually reported */ --=20 2.51.0.windows.2