From patchwork Fri Oct 17 09:46:33 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Emanuele Ghidoli X-Patchwork-Id: 72568 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id F0BCDCCD19A for ; Fri, 17 Oct 2025 10:58:39 +0000 (UTC) Received: from mail-lf1-f42.google.com (mail-lf1-f42.google.com [209.85.167.42]) by mx.groups.io with SMTP id smtpd.web10.11819.1760694783506717656 for ; Fri, 17 Oct 2025 02:53:03 -0700 Authentication-Results: mx.groups.io; dkim=pass header.i=@gmail.com header.s=20230601 header.b=menCjh9t; spf=pass (domain: gmail.com, ip: 209.85.167.42, mailfrom: ghidoliemanuele@gmail.com) Received: by mail-lf1-f42.google.com with SMTP id 2adb3069b0e04-57bd482dfd2so1704802e87.2 for ; Fri, 17 Oct 2025 02:53:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1760694781; x=1761299581; darn=lists.openembedded.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=yJ0WQ8RPL5uaaohfjxS8gr6rMfKvi9pJCK9UFynBBCs=; b=menCjh9tWtVnKh4U/qqX/dGX6ami4NQsiSQgIlR0I8rLnIXUAaG+nwqzYqCDvwB1PS uq+39ZoeoG+B5BXgPHygCwftVVMXUbWqXwoy47Zb5lBgzEaI7jJesaImHXzDlhMUlYog G/x960ZUopCDkZmYeOZdwX/MPSzadC1d0u2k576mQye5xQrd7Sj6SyvMHazFBYJsnnGM Sy4BBsG/iBOLQ0Umegt3KI2Lfw/dg1Qg1BbeRpJxZ7wIe6GKUGwbS2DrBJbsEGZUdwG0 0PDABijm0MLZvKy/7HIdBID03V383xkzHPJAKHtvM8MlsC5O8XhoN29+/HO+ndMEkekP tgKQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1760694781; x=1761299581; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=yJ0WQ8RPL5uaaohfjxS8gr6rMfKvi9pJCK9UFynBBCs=; b=vAHwT0gKJsQS3qOYkOwqdjUuInsLOwwjDZEE5RiCEzgx2iDsT5aef30DX7SV7wxlJn FrqR7OA0gDuSVQ9aoAUDKkexMk3Fw5FWiNeioGhanb/QWalq6sjDiJUMeS1SMaac93PU S5bng0FhkrwNM2WSsNpiTVhhSpIE2I6acFI2DPjQGH97PzuFAUzjX8JkNKuyMk3kCkGD iUTyRLgsuPpRfDJeV1VQrVWmtNezl8lZRwjlblNVv9ElEw7FtbtZ2xwi8NcSo+z6cQIK rHyzsb9CSBaxyw2g14WDQK4otwmlpq6ouSwTBgwvCEasxDS0FhjKTc69C7vav2fkg4T+ vm1Q== X-Gm-Message-State: AOJu0Yy1nnvoxlcF4jjtDI+ZxdEMDE4R6hggjOEPmW7a+d/CDgunOZOZ xdcW6AB97/ioO6/h1P/1ZvWOzE57wT8XOps/AWcaT+/FH9ta4AkI2bH6/gCLx+Pn X-Gm-Gg: ASbGncv7FlBzJcupyA3GIT9svdzhhusoTkPHPUeJ63PhGGlFPXBgJz5Za303upkyFNn dvX8sM2AObCXJWTUD0Nj+PMmj7eAL+yzzkHqPM5FPrgT711zWFcHqmMBjUgndRMa1KletfsaYOP cujH1ZdeBX+n5Us2W8aOKuLsyBWe+LmWXnlu0sWiA6io//92iw71QnMqkqqbCR4ZK0hV3r9VlTO 2EmFw/4zAmZr/bwLQSUsFcP3UC4rdrThSxGjgZ840x63XmVHCv8EdM7PKm3MigI3vmFh6MMqo0L i5diCZ/F8uj9CMPxRxJm8VGOqk22LFJKdaX3z96I8BMk/dHc6kVOEfEQR4lBrg3wRwc/cW9dvh6 m65LbPtVplBL3K++XwLNbJxaMbTE/oYPI4Lc4recB0Q0Aiv2n9gPa2bhtRVlUsmiSK0BXNxGAmH uTB2KAxF2MD428H+kFbHYgF93kQ/HopO4= X-Google-Smtp-Source: AGHT+IGku07nKLFlrPkWV0ELLgkn276ubh8R5Yflt5We0MmXwnTJ9jS138kQ2E+hAOqGmn7m+NEMRg== X-Received: by 2002:a05:600c:46c9:b0:471:747:2116 with SMTP id 5b1f17b1804b1-471179303d0mr21840915e9.41.1760694414997; Fri, 17 Oct 2025 02:46:54 -0700 (PDT) Received: from localhost.localdomain ([2001:b07:aac:705d:ae36:2eb:35ce:6a7b]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4711442dbaesm75368995e9.8.2025.10.17.02.46.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 17 Oct 2025 02:46:54 -0700 (PDT) From: Emanuele Ghidoli To: openembedded-devel@lists.openembedded.org Cc: Emanuele Ghidoli Subject: [meta-oe][master][PATCH 2/2] linux-serial-test: add patch to fix potential hang in while loop Date: Fri, 17 Oct 2025 11:46:33 +0200 Message-ID: <20251017094636.2976738-3-ghidoliemanuele@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20251017094636.2976738-1-ghidoliemanuele@gmail.com> References: <20251017094636.2976738-1-ghidoliemanuele@gmail.com> MIME-Version: 1.0 List-Id: X-Webhook-Received: from li982-79.members.linode.com [45.33.32.79] by aws-us-west-2-korg-lkml-1.web.codeaurora.org with HTTPS for ; Fri, 17 Oct 2025 10:58:39 -0000 X-Groupsio-URL: https://lists.openembedded.org/g/openembedded-devel/message/120751 From: Emanuele Ghidoli After commit 392f0f0ea76d ("linux-serial-test: Bump SRCREV to allow CMake 4+ compatibility"), an infinite while loop can occur even when the timeout has been reached. This patch fixes that regression. Signed-off-by: Emanuele Ghidoli --- ...t.c-fix-potential-hang-in-while-loop.patch | 60 +++++++++++++++++++ .../linux-serial-test_git.bb | 1 + 2 files changed, 61 insertions(+) create mode 100644 meta-oe/recipes-test/linux-serial-test/files/0002-linux-serial-test.c-fix-potential-hang-in-while-loop.patch diff --git a/meta-oe/recipes-test/linux-serial-test/files/0002-linux-serial-test.c-fix-potential-hang-in-while-loop.patch b/meta-oe/recipes-test/linux-serial-test/files/0002-linux-serial-test.c-fix-potential-hang-in-while-loop.patch new file mode 100644 index 000000000000..f0b7f65a601a --- /dev/null +++ b/meta-oe/recipes-test/linux-serial-test/files/0002-linux-serial-test.c-fix-potential-hang-in-while-loop.patch @@ -0,0 +1,60 @@ +From 9cf6c1d80c2f159dbb69967fbe934bf6de73c9e8 Mon Sep 17 00:00:00 2001 +From: Max Krummenacher +Date: Tue, 5 Aug 2025 09:35:06 +0200 +Subject: [PATCH 2/2] linux-serial-test.c: fix potential hang in while loop + +process_read_data() assumes that we can always wait for reception +of 1024 chars. However that is not true if one sets the number of +chars with the '-w' cmdline parameter or chars are lost. Maybe there +are other reasons. + +Replace the magic number of 1024 by calculating the number of expected +chars from _cl_tx_bytes. + +Brake a possible infinite while loop by adding a timeout to the loop +calculated from the expected chars times chartime. + +Upstream-Status: Submitted [https://github.com/cbrake/linux-serial-test/pull/61/] +Fixes: 7fd1057f8a95 ("Add loop to read all data in rcv buffer") +Signed-off-by: Max Krummenacher +Signed-off-by: Emanuele Ghidoli +--- + linux-serial-test.c | 14 ++++++++++++-- + 1 file changed, 12 insertions(+), 2 deletions(-) + +diff --git a/linux-serial-test.c b/linux-serial-test.c +index c2c8882d601b..294f53882570 100644 +--- a/linux-serial-test.c ++++ b/linux-serial-test.c +@@ -543,8 +543,13 @@ static unsigned char next_count_value(unsigned char c) + static void process_read_data(void) + { + unsigned char rb[1024]; ++ int loopcounter = 0; + int actual_read_count = 0; +- while (actual_read_count < 1024) { ++ int expected_read_count = _cl_tx_bytes == 0 ? 1024 : _cl_tx_bytes; ++ /* time for one char at current baudrate in us */ ++ int chartime = 1000000 * (8 + _cl_parity + 1 + _cl_2_stop_bit) / _cl_baud; ++ ++ while (actual_read_count < expected_read_count) { + int c = read(_fd, &rb, sizeof(rb)); + if (c > 0) { + if (_cl_rx_dump) { +@@ -577,7 +582,12 @@ static void process_read_data(void) + if (errno != EAGAIN) { + perror("read failed"); + } +- continue; // Retry the read ++ ++ if (loopcounter++ < expected_read_count) { ++ usleep(chartime); ++ continue; // Retry the read ++ } ++ break; + } else { + break; + } +-- +2.43.0 + diff --git a/meta-oe/recipes-test/linux-serial-test/linux-serial-test_git.bb b/meta-oe/recipes-test/linux-serial-test/linux-serial-test_git.bb index 66511bd9c312..7a206319e77d 100644 --- a/meta-oe/recipes-test/linux-serial-test/linux-serial-test_git.bb +++ b/meta-oe/recipes-test/linux-serial-test/linux-serial-test_git.bb @@ -5,6 +5,7 @@ LIC_FILES_CHKSUM = "file://LICENSES/MIT;md5=544799d0b492f119fa04641d1b8868ed" SRC_URI = "git://github.com/cbrake/linux-serial-test.git;protocol=https;branch=master \ file://0001-linux-serial-test.c-fix-returned-error-code.patch \ + file://0002-linux-serial-test.c-fix-potential-hang-in-while-loop.patch \ " PV = "0+git" SRCREV = "1a81f3c7be086ee01a9be8589a606426276c86d5"