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From: Jens Axboe <axboe@kernel.dk>
To: Johannes Berg <johannes@sipsolutions.net>,
	Luca Coelho <luca@coelho.fi>,
	"Grumbach, Emmanuel" <emmanuel.grumbach@intel.com>
Cc: linuxwifi <linuxwifi@intel.com>,
	"linux-wireless@vger.kernel.org" <linux-wireless@vger.kernel.org>,
	srinath.mannam@broadcom.com, Bjorn Helgaas <bhelgaas@google.com>
Subject: Re: iwlwifi firmware load broken in current -git
Date: Thu, 14 Sep 2017 11:00:23 -0600
Message-ID: <feabbc25-eb85-ffa2-0fd6-254c07e3574b@kernel.dk> (raw)
In-Reply-To: <1505246657.1974.11.camel@sipsolutions.net>

On 09/12/2017 02:04 PM, Johannes Berg wrote:
> On Tue, 2017-09-12 at 13:43 -0600, Jens Axboe wrote:
> 
>> CC'ing the guilty part and Bjorn. I'm assuming it's the
>> pci_is_enabled() check, since the rest of the patch shouldn't have
>> functional changes.
> 
> and pci_enable_bridge() already checks if it's already enabled, but
> still enables mastering in that case if it isn't:
> 
> static void pci_enable_bridge(struct pci_dev *dev)
> {
> [...]
>         if (pci_is_enabled(dev)) {
>                 if (!dev->is_busmaster)
>                         pci_set_master(dev);
>                 return;
>         }
> 
> so I guess due to the new check we end up with mastering disabled, and
> thus the firmware can't load since that's a DMA thing?

Bjorn/Srinath, any input here? This is a regression that prevents wifi
from working on a pretty standard laptop. It'd suck to have this be in
-rc1. Seems like the trivial fix would be:


diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index b0002daa50f3..ffbe11dbdd61 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -1394,7 +1394,7 @@ static int pci_enable_device_flags(struct pci_dev *dev, unsigned long flags)
 		return 0;		/* already enabled */
 
 	bridge = pci_upstream_bridge(dev);
-	if (bridge && !pci_is_enabled(bridge))
+	if (bridge)
 		pci_enable_bridge(bridge);
 
 	/* only skip sriov related */


-- 
Jens Axboe

  reply index

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-09-12 15:48 Jens Axboe
2017-09-12 16:11 ` Coelho, Luciano
2017-09-12 16:35   ` Jens Axboe
2017-09-12 16:36   ` Luca Coelho
2017-09-12 16:59     ` Jens Axboe
2017-09-12 19:43     ` Jens Axboe
2017-09-12 19:51       ` Luca Coelho
2017-09-12 20:04       ` Johannes Berg
2017-09-14 17:00         ` Jens Axboe [this message]
2017-09-14 17:11           ` Bjorn Helgaas
2017-09-14 17:22             ` Jens Axboe
2017-09-14 17:28               ` Srinath Mannam
2017-09-14 17:35                 ` Jens Axboe
2017-09-14 17:44                   ` Srinath Mannam
2017-09-14 17:45                     ` Jens Axboe
2017-09-14 17:50                     ` Johannes Berg
2017-09-14 17:44                   ` Jens Axboe
2017-09-14 20:04                     ` Srinath Mannam
2017-09-14 20:36                       ` Jens Axboe
2017-09-15 19:32                         ` Jens Axboe
2017-09-15 19:36                           ` Luca Coelho
2017-09-15 19:46                             ` Jens Axboe
2017-09-15 19:38                           ` Linus Torvalds
2017-09-15 19:43                             ` Luca Coelho
2017-09-15 19:51                               ` Linus Torvalds
2017-09-15 19:57                                 ` Jens Axboe
2017-09-15 19:48                             ` Jens Axboe
2017-09-15 19:51                               ` Luca Coelho
2017-09-15 19:55                                 ` Jens Axboe
2017-09-16  3:03                                   ` Bjorn Helgaas
2017-09-16 18:53                                     ` Jens Axboe

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