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| author | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2018-08-16 09:39:41 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-09-12 09:46:46 +0200 |
| commit | ae61cf5b9913027c6953a79ed3894da4f47061bd (patch) | |
| tree | 48996f836e052982c5fcfa35a57e5302cfda4bb8 /samples/qmi | |
| parent | f25a7ece08bdb1f2b3c4bbeae942682fc3a99dde (diff) | |
| download | linux-ae61cf5b9913027c6953a79ed3894da4f47061bd.tar.bz2 | |
uio: ensure class is registered before devices
When both uio and the uio drivers are built in the kernel, it is possible
for a driver to register devices before the uio class is registered.
This may result in a NULL pointer dereference later on in
get_device_parent() when accessing the class glue_dirs spinlock.
The trace looks like that:
Unable to handle kernel NULL pointer dereference at virtual address 00000140
[...]
[<ffff0000089cc234>] _raw_spin_lock+0x14/0x48
[<ffff0000084f56bc>] device_add+0x154/0x6a0
[<ffff0000084f5e48>] device_create_groups_vargs+0x120/0x128
[<ffff0000084f5edc>] device_create+0x54/0x60
[<ffff0000086e72c0>] __uio_register_device+0x120/0x4a8
[<ffff000008528b7c>] jaguar2_pci_probe+0x2d4/0x558
[<ffff0000083fc18c>] local_pci_probe+0x3c/0xb8
[<ffff0000083fd81c>] pci_device_probe+0x11c/0x180
[<ffff0000084f88bc>] driver_probe_device+0x22c/0x2d8
[<ffff0000084f8a24>] __driver_attach+0xbc/0xc0
[<ffff0000084f69fc>] bus_for_each_dev+0x4c/0x98
[<ffff0000084f81b8>] driver_attach+0x20/0x28
[<ffff0000084f7d08>] bus_add_driver+0x1b8/0x228
[<ffff0000084f93c0>] driver_register+0x60/0xf8
[<ffff0000083fb918>] __pci_register_driver+0x40/0x48
Return EPROBE_DEFER in that case so the driver can register the device
later.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'samples/qmi')
0 files changed, 0 insertions, 0 deletions