blackbird-op-linux/drivers/staging/axis-fifo, branch master

staging: axis-fifo: replace spinlock with mutex

2020-01-22T08:58:01+00:00

Following the device's documentation guidance, reading a packet from the device or writing a packet to it must be atomic. Previously, only reading device's vacancy (before writing on it) or occupancy (before reading from it) was locked. Hence, effectively reading the packet or writing the packet wasn't locked at all. However, reading a packet (and writing one, to a lesser extent) requires to read 3 different registers in a specific order, without missing one or else we should reset the device. This patch fixes the device's locking mechanism on the FIFO character device. As the device was using copy_from_user() and copy_to_user(), we need to replace spinlocks with mutexes. Signed-off-by: Quentin Deslandes Link: https://lore.kernel.org/r/20200121103958.12941-1-quentin.deslandes@itdev.co.uk Signed-off-by: Greg Kroah-Hartman

staging: axis-fifo: add unspecified HAS_IOMEM dependency

2019-12-17T08:22:11+00:00

Currently CONFIG_XIL_AXIS_FIFO=y implicitly depends on CONFIG_HAS_IOMEM=y; consequently, on architectures without IOMEM we get the following build error: ld: drivers/staging/axis-fifo/axis-fifo.o: in function `axis_fifo_probe': drivers/staging/axis-fifo/axis-fifo.c:809: undefined reference to `devm_ioremap_resource' Fix the build error by adding the unspecified dependency. Reported-by: Brendan Higgins Signed-off-by: Brendan Higgins Link: https://lore.kernel.org/r/20191211192742.95699-7-brendanhiggins@google.com Signed-off-by: Greg Kroah-Hartman

staging: axis-fifo: remove unused pointer to memory resource

2019-11-03T12:09:01+00:00

Remove unused resource pointer from the device's internal structure. Signed-off-by: Quentin Deslandes Link: https://lore.kernel.org/r/20191101214232.16960-4-quentin.deslandes@itdev.co.uk Signed-off-by: Greg Kroah-Hartman

staging: axis-fifo: request resources using managed functions

2019-11-03T12:09:01+00:00

Request device's resources (memory, interrupt...) using managed function. Signed-off-by: Quentin Deslandes Link: https://lore.kernel.org/r/20191101214232.16960-3-quentin.deslandes@itdev.co.uk Signed-off-by: Greg Kroah-Hartman

staging: axis-fifo: avoid parsing ignored device tree properties

2019-11-03T12:09:01+00:00

Some properties were parsed from the device tree and then ignored by the driver. Some would return an error if absent from the device tree, then return an error if they were found because they are unsupported by the driver. Avoid parsing unused properties and clearly explain in the documentation the ignored / unsupported properties. Signed-off-by: Quentin Deslandes Link: https://lore.kernel.org/r/20191101214232.16960-2-quentin.deslandes@itdev.co.uk Signed-off-by: Greg Kroah-Hartman

staging: remove redundant 'default n' from Kconfig

2019-04-16T11:39:01+00:00

'default n' is the default value for any bool or tristate Kconfig setting so there is no need to write it explicitly. Also since commit f467c5640c29 ("kconfig: only write '# CONFIG_FOO is not set' for visible symbols") the Kconfig behavior is the same regardless of 'default n' being present or not: ... One side effect of (and the main motivation for) this change is making the following two definitions behave exactly the same: config FOO bool config FOO bool default n With this change, neither of these will generate a '# CONFIG_FOO is not set' line (assuming FOO isn't selected/implied). That might make it clearer to people that a bare 'default n' is redundant. ... Signed-off-by: Bartlomiej Zolnierkiewicz Signed-off-by: Greg Kroah-Hartman

staging: axis-fifo: Add elaborate description in Kconfig

2019-04-16T11:38:15+00:00

- The Xilinx AXI-Stream FIFO IP core driver description is elaborated. - References: Xilinx PG080 document, axis-fifo.txt Signed-off-by: Moses Christopher Signed-off-by: Greg Kroah-Hartman

staging: add missing SPDX lines to Makefile files

2019-04-03T09:10:15+00:00

There are a few remaining drivers/staging/*/Makefile files that do not have SPDX identifiers in them. Add the correct GPL-2.0 identifier to them to make scanning tools happy. Reviewed-by: Mukesh Ojha Signed-off-by: Greg Kroah-Hartman

staging: add missing SPDX lines to Kconfig files

2019-04-03T09:10:15+00:00

There are a few remaining drivers/staging/*/Kconfig files that do not have SPDX identifiers in them. Add the correct GPL-2.0 identifier to them to make scanning tools happy. Signed-off-by: Greg Kroah-Hartman

staging: axis-fifo: add CONFIG_OF dependency

2019-03-18T06:57:58+00:00

When building without CONFIG_OF, the compiler loses track of the flow control in axis_fifo_probe(), and thinks that many variables are used without an initialization even though we actually leave the function before the first use: drivers/staging/axis-fifo/axis-fifo.c: In function 'axis_fifo_probe': drivers/staging/axis-fifo/axis-fifo.c:900:5: error: 'rxd_tdata_width' may be used uninitialized in this function [-Werror=maybe-uninitialized] if (rxd_tdata_width != 32) { ^ drivers/staging/axis-fifo/axis-fifo.c:907:5: error: 'txd_tdata_width' may be used uninitialized in this function [-Werror=maybe-uninitialized] if (txd_tdata_width != 32) { ^ drivers/staging/axis-fifo/axis-fifo.c:914:5: error: 'has_tdest' may be used uninitialized in this function [-Werror=maybe-uninitialized] if (has_tdest) { ^ drivers/staging/axis-fifo/axis-fifo.c:919:5: error: 'has_tid' may be used uninitialized in this function [-Werror=maybe-uninitialized] When CONFIG_OF is set, this does not happen, and since the driver cannot work without it, just add that option as a Kconfig dependency. Signed-off-by: Arnd Bergmann Signed-off-by: Greg Kroah-Hartman