From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 058BEBA33 for ; Wed, 1 Jan 2025 10:19:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1735726779; cv=none; b=Sw1LMzI+Ud7iwqtNmkFiYBuNpKOYSxHuxLYhdyAmF26/SMe2IKkm2nXy3c5CXvtWk1KYaWAD7A/tXg52mw7EWDkxiX8vxa+11VzIp/VqAg9CxdT6bNyEgnRTxrn62+CGOERoC8oMFJ+103tDIKwlBgA2x2i291FvUSrxl3HUwy4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1735726779; c=relaxed/simple; bh=W9f98kYMOcylfFcPwc02PRbpoQQUodjm59OExSdKpL4=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=gMYTSxxciziHnywIBT+fTPL5shsG11vq5LCC/xcR3b+4uQrtAzD1vbebPO+msFPXvP8wIh/w7uDYIAM/gQ9d1weKPMy8VGbSTayAem120oS/fYBxCly/zbJUIFTCwgfNPgWpnDRZSHAyfJOkb2eB97bW3TB1p1jawuTnbjR1xgs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=G23cNEI7; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="G23cNEI7" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2FDC8C4CED1; Wed, 1 Jan 2025 10:19:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1735726778; bh=W9f98kYMOcylfFcPwc02PRbpoQQUodjm59OExSdKpL4=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=G23cNEI7x0kKFwG5iPnaCkXaFZQkBrQouzHtmnwJwFItLFVH+d4Y79szUmKHD66Pu HCvktil6MZ/GwFyRQtM1biryHqzce2xH5iD2Y/stJkCiLIZREUJU+TXsNefYat0zLJ mqTHlzFz2I0aaPDwccOobsJe8l7JfegXe/CD7LEw= Date: Wed, 1 Jan 2025 11:18:51 +0100 From: Greg KH To: Jate Sujjavanich Cc: linux-usb@vger.kernel.org Subject: Re: USB and EOL LTS Kernel Advice Message-ID: <2025010114-quicken-quickly-0411@gregkh> References: Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Tue, Dec 31, 2024 at 09:59:45AM -0500, Jate Sujjavanich wrote: > I have a device running the 4.19 LTS kernel which just went end of > life. It has some USB signal integrity issues which result in "clear > tt" loops until the bus can recover (if it can). This can result in > system hangs including with lsusb. > > Management would like for me to patch our Linux kernel to work around > the problem thinking that a kernel fix is much less costly than > deploying a hardware fix. There are some USB fixes in the upstream > which might help. But I think I will be without community support. > > What advice do you have? Upgrade to a newer, and properly supported, kernel version. 4.19 is already very old and obsolete and full of known security problems. If you stick to 4.19, you are on your own for all support and everything else. Good luck! greg k-h