From: "Isaac J. Manjarres" isaacmanjarres@google.com
stable inclusion from stable-v4.19.270 commit 728c23ee14f01858632625556e51c2d1db4a414e category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I6DPF8 CVE: NA
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commit 27c0d217340e47ec995557f61423ef415afba987 upstream.
When a driver registers with a bus, it will attempt to match with every device on the bus through the __driver_attach() function. Currently, if the bus_type.match() function encounters an error that is not -EPROBE_DEFER, __driver_attach() will return a negative error code, which causes the driver registration logic to stop trying to match with the remaining devices on the bus.
This behavior is not correct; a failure while matching a driver to a device does not mean that the driver won't be able to match and bind with other devices on the bus. Update the logic in __driver_attach() to reflect this.
Fixes: 656b8035b0ee ("ARM: 8524/1: driver cohandle -EPROBE_DEFER from bus_type.match()") Cc: stable@vger.kernel.org Cc: Saravana Kannan saravanak@google.com Signed-off-by: Isaac J. Manjarres isaacmanjarres@google.com Link: https://lore.kernel.org/r/20220921001414.4046492-1-isaacmanjarres@google.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Yongqiang Liu liuyongqiang13@huawei.com --- drivers/base/dd.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/base/dd.c b/drivers/base/dd.c index 1e15973f17a1..0377c3c0f2d4 100644 --- a/drivers/base/dd.c +++ b/drivers/base/dd.c @@ -956,8 +956,12 @@ static int __driver_attach(struct device *dev, void *data) */ return 0; } else if (ret < 0) { - dev_dbg(dev, "Bus failed to match device: %d", ret); - return ret; + dev_dbg(dev, "Bus failed to match device: %d\n", ret); + /* + * Driver could not match with device, but may match with + * another device on the bus. + */ + return 0; } /* ret > 0 means positive match */
device_driver_attach(drv, dev);