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| author |   Jiri Slaby <jslaby@suse.cz> | 2022-01-24 08:14:22 +0100 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-01-26 14:54:48 +0100 |
| commit | 4e2a44c1408b6a6a46122704511234f68cf012b8 (patch) | |
| tree | 8c74c1c2e7872e5cbb3ddb06a46a7647a4a96da0 /include/linux/tty_port.h | |
| parent | serial: atmel_serial: include circ_buf.h (diff) | |
| download | linux-dev-4e2a44c1408b6a6a46122704511234f68cf012b8.tar.xz linux-dev-4e2a44c1408b6a6a46122704511234f68cf012b8.zip | |
tty: add kfifo to tty_port
Define a kfifo inside struct tty_port. We use DECLARE_KFIFO_PTR and let
the preexisting tty_port::xmit_buf be also the buffer for the kfifo.
And handle the initialization/decomissioning along with xmit_buf, i.e.
in tty_port_alloc_xmit_buf() and tty_port_free_xmit_buf(), respectively.
This allows for kfifo use in drivers which opt-in, while others still
may use the old xmit_buf. mxser will be the first user in the next
few patches.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20220124071430.14907-4-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/tty_port.h')
| -rw-r--r-- | include/linux/tty_port.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/tty_port.h b/include/linux/tty_port.h index d3ea9ed0b98e..58e9619116b7 100644 --- a/include/linux/tty_port.h +++ b/include/linux/tty_port.h @@ -2,6 +2,7 @@ #ifndef _LINUX_TTY_PORT_H #define _LINUX_TTY_PORT_H +#include <linux/kfifo.h> #include <linux/kref.h> #include <linux/mutex.h> #include <linux/tty_buffer.h> @@ -67,6 +68,7 @@ extern const struct tty_port_client_operations tty_port_default_client_ops; * @mutex: locking, for open, shutdown and other port operations * @buf_mutex: @xmit_buf alloc lock * @xmit_buf: optional xmit buffer used by some drivers + * @xmit_fifo: optional xmit buffer used by some drivers * @close_delay: delay in jiffies to wait when closing the port * @closing_wait: delay in jiffies for output to be sent before closing * @drain_delay: set to zero if no pure time based drain is needed else set to @@ -110,6 +112,7 @@ struct tty_port { struct mutex mutex; struct mutex buf_mutex; unsigned char *xmit_buf; + DECLARE_KFIFO_PTR(xmit_fifo, unsigned char); unsigned int close_delay; unsigned int closing_wait; int drain_delay; |