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| author |   David S. Miller <davem@davemloft.net> | 2019-01-27 10:43:17 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-01-27 10:43:17 -0800 |
| commit | 1d68101367a92336e633d0c3681bf8c86644e124 (patch) | |
| tree | 8fdacef561481c25c71641b8fa91a5dfa0ba7f96 /drivers/tty/serial/serial_core.c | |
| parent | net: lmc: remove -I. header search path (diff) | |
| parent | Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm (diff) | |
| download | linux-dev-1d68101367a92336e633d0c3681bf8c86644e124.tar.xz linux-dev-1d68101367a92336e633d0c3681bf8c86644e124.zip | |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Diffstat (limited to 'drivers/tty/serial/serial_core.c')
| -rw-r--r-- | drivers/tty/serial/serial_core.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c index d4cca5bdaf1c..5c01bb6d1c24 100644 --- a/drivers/tty/serial/serial_core.c +++ b/drivers/tty/serial/serial_core.c @@ -550,10 +550,12 @@ static int uart_put_char(struct tty_struct *tty, unsigned char c) int ret = 0; circ = &state->xmit; - if (!circ->buf) + port = uart_port_lock(state, flags); + if (!circ->buf) { + uart_port_unlock(port, flags); return 0; + } - port = uart_port_lock(state, flags); if (port && uart_circ_chars_free(circ) != 0) { circ->buf[circ->head] = c; circ->head = (circ->head + 1) & (UART_XMIT_SIZE - 1); @@ -586,11 +588,13 @@ static int uart_write(struct tty_struct *tty, return -EL3HLT; } + port = uart_port_lock(state, flags); circ = &state->xmit; - if (!circ->buf) + if (!circ->buf) { + uart_port_unlock(port, flags); return 0; + } - port = uart_port_lock(state, flags); while (port) { c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE); if (count < c) |