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 811B91465A8; Tue, 25 Jun 2024 09:48:59 +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=1719308939; cv=none; b=Vbrp5QBhdWnzrYQ+rEXHrGVGM7m9+YZarvC+ZO1iCvNE5fZZ9hM7x/DFTwsHpwSchcTB/YVsZCNtNGTI9VjGq2tAW8Oyyp2zlD1msmQ6onDLl8ttoVdQbAhCEEDFHO/eKJwHA0Q/Bn6gYiPigFBKfEbPIvM9kh+txGktPjwC4Uo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719308939; c=relaxed/simple; bh=1Bs4fp4fUSFSxvPNYFXGD3nXYWpUoXVya7xg+Z6vpzA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=rUJYhr4lgDBpbOtg2F5HbFM0HsGLYUupsHHrps/hixiQWZ4ZJWP91m2T9Eq0tAklWx/zpWh5fonj/d+UZTynL6Ufz6CHMqwY23XC7UyfniipNVvvINZ30CdGx2QAlscIgIZ3qOhD3V5/VDhN58ZR+QMi68HBjmEfJ6aGJ6otpMM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=c4wE995p; 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="c4wE995p" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A4902C32781; Tue, 25 Jun 2024 09:48:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1719308939; bh=1Bs4fp4fUSFSxvPNYFXGD3nXYWpUoXVya7xg+Z6vpzA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=c4wE995pr5+VPkfgwuD4XaVhvOQZt/z+q6Wx5ieo1TjxGId0FLqUuFZqUHVCHtyA7 jbLgCHCvAs3Bgr1kMjGnSlhtHDMrkuLEDGc7ndG0hBWDTPs9kOwnq3F0JLTn76lDPD mC+haeR3Y9j4fy0adCia1+bJSh0buKrwhnJuh9oU= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Ben Fradella , Andy Shevchenko , Klara Modin , Shinichiro Kawasaki , Hans de Goede , Sasha Levin Subject: [PATCH 6.6 040/192] platform/x86: p2sb: Dont init until unassigned resources have been assigned Date: Tue, 25 Jun 2024 11:31:52 +0200 Message-ID: <20240625085538.703731170@linuxfoundation.org> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240625085537.150087723@linuxfoundation.org> References: <20240625085537.150087723@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Ben Fradella [ Upstream commit 2c6370e6607663fc5fa0fd9ed58e2e01014898c7 ] The P2SB could get an invalid BAR from the BIOS, and that won't be fixed up until pcibios_assign_resources(), which is an fs_initcall(). - Move p2sb_fs_init() to an fs_initcall_sync(). This is still early enough to avoid a race with any dependent drivers. - Add a check for IORESOURCE_UNSET in p2sb_valid_resource() to catch unset BARs going forward. - Return error values from p2sb_fs_init() so that the 'initcall_debug' cmdline arg provides useful data. Signed-off-by: Ben Fradella Acked-by: Andy Shevchenko Tested-by: Klara Modin Reviewed-by: Shin'ichiro Kawasaki Link: https://lore.kernel.org/r/20240509164905.41016-1-bcfradella@proton.me Reviewed-by: Hans de Goede Signed-off-by: Hans de Goede Signed-off-by: Sasha Levin --- drivers/platform/x86/p2sb.c | 29 +++++++++++++++-------------- 1 file changed, 15 insertions(+), 14 deletions(-) diff --git a/drivers/platform/x86/p2sb.c b/drivers/platform/x86/p2sb.c index a64f56ddd4a44..053be5c5e0cad 100644 --- a/drivers/platform/x86/p2sb.c +++ b/drivers/platform/x86/p2sb.c @@ -56,12 +56,9 @@ static int p2sb_get_devfn(unsigned int *devfn) return 0; } -static bool p2sb_valid_resource(struct resource *res) +static bool p2sb_valid_resource(const struct resource *res) { - if (res->flags) - return true; - - return false; + return res->flags & ~IORESOURCE_UNSET; } /* Copy resource from the first BAR of the device in question */ @@ -220,16 +217,20 @@ EXPORT_SYMBOL_GPL(p2sb_bar); static int __init p2sb_fs_init(void) { - p2sb_cache_resources(); - return 0; + return p2sb_cache_resources(); } /* - * pci_rescan_remove_lock to avoid access to unhidden P2SB devices can - * not be locked in sysfs pci bus rescan path because of deadlock. To - * avoid the deadlock, access to P2SB devices with the lock at an early - * step in kernel initialization and cache required resources. This - * should happen after subsys_initcall which initializes PCI subsystem - * and before device_initcall which requires P2SB resources. + * pci_rescan_remove_lock() can not be locked in sysfs PCI bus rescan path + * because of deadlock. To avoid the deadlock, access P2SB devices with the lock + * at an early step in kernel initialization and cache required resources. + * + * We want to run as early as possible. If the P2SB was assigned a bad BAR, + * we'll need to wait on pcibios_assign_resources() to fix it. So, our list of + * initcall dependencies looks something like this: + * + * ... + * subsys_initcall (pci_subsys_init) + * fs_initcall (pcibios_assign_resources) */ -fs_initcall(p2sb_fs_init); +fs_initcall_sync(p2sb_fs_init); -- 2.43.0