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 D390D35DA62; Wed, 18 Mar 2026 12:56:55 +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=1773838615; cv=none; b=aP9L0vBLVrQYsw+hTsrM8YocOARgII00dvL3fY3QZctv37yx3sur2xCXSGZGNuXdbSH4tOLr3LfX9OboudOsJTgmXk4LVyu4WCHijUjzAwD0GlXvCmpRRjURGZzuLe+sETtbbv0EQgknFAEbFrg8odLSHkqoatWjgjd7dZNqu6Q= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773838615; c=relaxed/simple; bh=mfYTnNZDsq/84BTNt93jjgrXP0yMRLU8JHYrV/pu6KY=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=PchYjswxXrEBjI9wiDZDjMtTdXXrgOmzIAbpaXtwiYlCDleVMZgBRmisDN1Z1SI72TwtYPRdJHL3xZM0vyiXIS/0gOAAeTCkM8pioDHnVS0DqcvpIz0756mGky2dXKdpLZnNv/6QAMepgqxl1taO2pVPUuyPmnqqgA8kTJX+dAk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=A50w9F9k; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="A50w9F9k" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CCCB5C19421; Wed, 18 Mar 2026 12:56:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1773838615; bh=mfYTnNZDsq/84BTNt93jjgrXP0yMRLU8JHYrV/pu6KY=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=A50w9F9kRP8125qtrWIm030zvx5i+glGMQKi5tizMsUTvBIE4PRJqP7cXnvdZ+MpC JkliPUhNbXqZAgDMAFYCRHppWQBHGvazsKgn1K8KGDT1qh+taCt8xXRO76Pczxhk7j AgRgPm7YsWgh0i1nVEC4LfN32aTTiViqmFfMW0s0e8Lgdh9RQCbDSebnO9rnpymD5V e9r2W12hX3n5Z+WJ/hHuMvauSkKGcg2XnbblkLtgAqF8aA6gIjjujq4ISAo62aUEmy 6qsm3HqReuZ44BTW7SQtW0Z+O+Uj4uSRDvy2yxWOrt72PZ1uO8aWmOHsLW4nKZjqVV TzII9hli1pAkA== Message-ID: <8298861bdc60451c114479718fefe9ac856f228a.camel@kernel.org> Subject: Re: [PATCH] firmware_loader: allow firmware_class.path to take multiple paths From: Jeff Layton To: Greg Kroah-Hartman Cc: Luis Chamberlain , Russ Weight , Danilo Krummrich , "Rafael J. Wysocki" , Michal Grzedzicki , driver-core@lists.linux.dev, linux-kernel@vger.kernel.org Date: Wed, 18 Mar 2026 08:56:52 -0400 In-Reply-To: <2026031838-wieldable-enlisted-5398@gregkh> References: <20260318-fw-path-v1-1-7884d9bf618f@kernel.org> <2026031838-wieldable-enlisted-5398@gregkh> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV T2h6v8i8YqsATFPwO4nuiTmL6I40ZofxVd+9wdRI4Db8yUNA4ZSP2nqLcLtFjClYRBoJvRWvsv4lm 0OX6MYPtv76hka8lW4mnRmZqqx3UtfHX/hF/zH24Gj7A6sYKYLCU3YrI2Ogiu7/ksKcl7goQjpvtV YrOOI5VGLHge0awt7bhMCTM9KAfPc+xL/ZxAMVWd3NCk5SamL2cE99UWgtvNOIYU8m6EjTLhsj8sn VluJH0/RcxEeFbnSaswVChNSGa7mXJrTR22lRL6ZPjdMgS2Km90haWPRc8Wolcz07Y2se0xpGVLEQ cDEsvv5IMmeMe1/qLZ6NaVkNuL3WOXvxaVT9USW1+/SGipO2IpKJjeDZfehlB/kpfF24+RrK+seQf 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Yy9YbXtWctUz8uvDR7shsQxAhX3qO7DilMtuGo1v97I/Kx4gXQ52syh/w6EBny71CZrOgD6kJwPVV AaM1LRC28muq91WCFhs/nzHozpbzcheyGtMUI2Ao4K6mnY+3zIuXPygZMFr9KXE6fF7HzKxKuZMJO aEZCiDOq0anx6FmOzs5E6Jqdpo/mtI8beK+BE7Va6ni7YrQlnT0i3vaTVMTiCThbqsB20VrbMjlhp f8lfK1XVNbRq/R7GZ9zHESlsa35ha60yd/j3pu5hT2xyy8krV8vGhHvnJ1XRMJBAB/UYb6FyC7S+m QZIQXVeAA+smfTT0tDrisj1U5x6ZB9b3nBg65kc= Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.58.3 (3.58.3-1.fc43) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Wed, 2026-03-18 at 13:40 +0100, Greg Kroah-Hartman wrote: > On Wed, Mar 18, 2026 at 08:25:54AM -0400, Jeff Layton wrote: > > Refactor fw_get_filesystem_firmware() by extracting the per-path > > firmware loading logic into a new fw_try_firmware_path() helper. > >=20 > > Use this helper to parse fw_path_para for ';'-separated paths, > > trying each one before falling through to the default firmware > > search paths. This allows users to specify multiple custom firmware > > directories via firmware_class.path, e.g.: > >=20 > > firmware_class.path=3D/custom/path1;/custom/path2 > >=20 > > Suggested-by: Michal Grzedzicki > > Signed-off-by: Jeff Layton > > --- > > This is something Michal had asked for last year, and I just got around > > to implementing. Tested with a dummy module that calls > > request_firmware(). > > --- > > drivers/base/firmware_loader/main.c | 197 +++++++++++++++++++++-------= -------- > > 1 file changed, 118 insertions(+), 79 deletions(-) > >=20 > > diff --git a/drivers/base/firmware_loader/main.c b/drivers/base/firmwar= e_loader/main.c > > index a11b30dda23be563bd55f25474ceff2153ddd667..5328d28a2141e85265e1bcc= 20e995ce4c5517c36 100644 > > --- a/drivers/base/firmware_loader/main.c > > +++ b/drivers/base/firmware_loader/main.c > > @@ -470,7 +470,6 @@ static int fw_decompress_xz(struct device *dev, str= uct fw_priv *fw_priv, > > /* direct firmware loading support */ > > static char fw_path_para[256]; > > static const char * const fw_path[] =3D { > > - fw_path_para, > > "/lib/firmware/updates/" UTS_RELEASE, > > "/lib/firmware/updates", > > "/lib/firmware/" UTS_RELEASE, > > @@ -480,10 +479,83 @@ static const char * const fw_path[] =3D { > > /* > > * Typical usage is that passing 'firmware_class.path=3D$CUSTOMIZED_PA= TH' > > * from kernel command line because firmware_class is generally built = in > > - * kernel instead of module. > > + * kernel instead of module. Multiple paths can be separated by ';'. > > */ > > module_param_string(path, fw_path_para, sizeof(fw_path_para), 0644); > > -MODULE_PARM_DESC(path, "customized firmware image search path with a h= igher priority than default path"); > > +MODULE_PARM_DESC(path, "customized firmware image search path with a h= igher priority than default path, multiple paths can be separated by ';'"); >=20 > Ah, you documented it here, sorry, I missed that. >=20 If there's another spot we should document this, then happy to do so as well. I didn't see much about this subsystem under Documentation/. > But still, why ';'? >=20 Honestly, I don't know why, but I was thinking that ';' was the traditional $PATH separator at the time. I'll change it to ':'. Expect a v2 soon! Thanks, --=20 Jeff Layton