linux.git/drivers/uio, branch v4.20-rc2

uio: Convert a few more users to using %pOFn instead of device_node.name

2018-10-02T22:59:29+00:00

In preparation to remove the node name pointer from struct device_node,
convert printf users to use the %pOFn format specifier.

Cc: Greg Kroah-Hartman 
Signed-off-by: Rob Herring 
Signed-off-by: Greg Kroah-Hartman

uio: make symbol 'uio_class_registered' static

2018-10-02T22:38:14+00:00

Fixes the following sparse warning:

drivers/uio/uio.c:277:6: warning:
 symbol 'uio_class_registered' was not declared. Should it be static?

Fixes: ae61cf5b9913 ("uio: ensure class is registered before devices")
Signed-off-by: Wei Yongjun 
Signed-off-by: Greg Kroah-Hartman

uio_hv_generic: defer opening vmbus until first use

2018-09-25T18:33:24+00:00

This fixes two design flaws in hv_uio_generic.

Since hv_uio_probe is called from vmbus_probe with lock held
it potentially can cause sleep in an atomic section because
vmbus_open will wait for response from host.

The hv_uio_generic driver could not handle applications
exiting and restarting because the vmbus channel was
persistent.  Change the semantics so that the buffers are
allocated on probe, but not attached to host until
device is opened.

Signed-off-by: Stephen Hemminger 
Signed-off-by: Greg Kroah-Hartman

hv_uio_generic: map ringbuffer phys addr

2018-09-25T18:33:24+00:00

The ring buffer is contiguous IOVA and is mapped via phys addr
for sysfs file. Use same method for the UIO mapping.

Signed-off-by: Stephen Hemminger 
Signed-off-by: Greg Kroah-Hartman

uio: introduce UIO_MEM_IOVA

2018-09-25T18:33:24+00:00

Introduce the concept of mapping physical memory locations that
are normal memory. The new type UIO_MEM_IOVA are similar to
existing UIO_MEM_PHYS but the backing memory is not marked as uncached.

Also, indent related switch to the currently used style.

Signed-off-by: Stephen Hemminger 
Signed-off-by: Greg Kroah-Hartman

vmbus: keep pointer to ring buffer page

2018-09-25T18:33:24+00:00

Avoid going from struct page to virt address (and back) by just
keeping pointer to the allocated pages instead of virt address.

Signed-off-by: Stephen Hemminger 
Signed-off-by: Greg Kroah-Hartman

uio: convert to vm_fault_t

2018-09-12T07:46:46+00:00

As part of commit 9b85e95a3080 ("uio: Change return
type to vm_fault_t") in 4.19-rc1, this conversion
was missed. Now converted 'ret' to vm_fault_t type.

Signed-off-by: Souptick Joarder 
Signed-off-by: Greg Kroah-Hartman

uio: Convert to using %pOFn instead of device_node.name

2018-09-12T07:46:46+00:00

In preparation to remove the node name pointer from struct device_node,
convert printf users to use the %pOFn format specifier.

Cc: Greg Kroah-Hartman 
Signed-off-by: Rob Herring 
Signed-off-by: Greg Kroah-Hartman

uio: ensure class is registered before devices

2018-09-12T07:46:46+00:00

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
[...]
[] _raw_spin_lock+0x14/0x48
[] device_add+0x154/0x6a0
[] device_create_groups_vargs+0x120/0x128
[] device_create+0x54/0x60
[] __uio_register_device+0x120/0x4a8
[] jaguar2_pci_probe+0x2d4/0x558
[] local_pci_probe+0x3c/0xb8
[] pci_device_probe+0x11c/0x180
[] driver_probe_device+0x22c/0x2d8
[] __driver_attach+0xbc/0xc0
[] bus_for_each_dev+0x4c/0x98
[] driver_attach+0x20/0x28
[] bus_add_driver+0x1b8/0x228
[] driver_register+0x60/0xf8
[] __pci_register_driver+0x40/0x48

Return EPROBE_DEFER in that case so the driver can register the device
later.

Signed-off-by: Alexandre Belloni 
Signed-off-by: Greg Kroah-Hartman

uio_hv_generic: drop #ifdef DEBUG

2018-09-12T07:46:46+00:00

DEBUG is leftover from the development phase, remove it.

Signed-off-by: Stephen Hemminger 
Signed-off-by: K. Y. Srinivasan 
Signed-off-by: Greg Kroah-Hartman