kernel/linux.git/drivers/uio, branch linux-4.20.y

uio_hv_generic: set callbacks on open

2018-12-11T13:23:17+00:00

This fixes the problem where uio application was unable to use multple queues on restart. The root cause is that the callbacks are cleared on disconnect. Change to setting up callbacks everytime in open. Fixes: cdfa835c6e5e ("uio_hv_generic: defer opening vmbus until first use") Reported-by: Mohammed Gamal Signed-off-by: Stephen Hemminger Signed-off-by: Greg Kroah-Hartman

uio: Fix an Oops on load

2018-11-11T17:21:46+00:00

I was trying to solve a double free but I introduced a more serious NULL dereference bug. The problem is that if there is an IRQ which triggers immediately, then we need "info->uio_dev" but it's not set yet. This patch puts the original initialization back to how it was and just sets info->uio_dev to NULL on the error path so it should solve both the Oops and the double free. Fixes: f019f07ecf6a ("uio: potential double frees if __uio_register_device() fails") Reported-by: Mathias Thore Signed-off-by: Dan Carpenter Cc: stable Tested-by: Mathias Thore Signed-off-by: Greg Kroah-Hartman

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