lkml.org 
[lkml]   [2018]   [Aug]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[RFC PATCH 2/6] pci: Set pci_dev->is_added before calling device_add
Date
This re-fixes the bug reported by Hari Vyas <hari.vyas@broadcom.com>
after my revert of his commit but in a much simpler way.

The main issues is that is_added was being set after the driver
got bound and started, and thus setting it could race with other
changes to struct pci_dev.

This fixes it by setting the flag first, which also has the
advantage of matching the fact that we are clearing it *after*
unbinding in the remove path, thus the flag is now symtetric
and always set while the driver code is running.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
drivers/pci/bus.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
index 35b7fc87eac5..48ae63673aa8 100644
--- a/drivers/pci/bus.c
+++ b/drivers/pci/bus.c
@@ -321,16 +321,16 @@ void pci_bus_add_device(struct pci_dev *dev)
pci_proc_attach_device(dev);
pci_bridge_d3_update(dev);

+ dev->is_added = 1;
dev->match_driver = true;
retval = device_attach(&dev->dev);
if (retval < 0 && retval != -EPROBE_DEFER) {
+ dev->is_added = 0;
pci_warn(dev, "device attach failed (%d)\n", retval);
pci_proc_detach_device(dev);
pci_remove_sysfs_dev_files(dev);
return;
}
-
- dev->is_added = 1;
}
EXPORT_SYMBOL_GPL(pci_bus_add_device);

--
2.17.1
\
 
 \ /
  Last update: 2018-08-17 07:12    [W:0.825 / U:2.660 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site