CVE ID:	CVE-2023-52456
Description:	In the Linux kernel, the following vulnerability has been resolved: serial: imx: fix tx statemachine deadlock When using the serial port as RS485 port, the tx statemachine is used to control the RTS pin to drive the RS485 transceiver TX_EN pin. When the TTY port is closed in the middle of a transmission (for instance during userland application crash), imx_uart_shutdown disables the interface and disables the Transmission Complete interrupt. afer that, imx_uart_stop_tx bails on an incomplete transmission, to be retriggered by the TC interrupt. This interrupt is disabled and therefore the tx statemachine never transitions out of SEND. The statemachine is in deadlock now, and the TX_EN remains low, making the interface useless. imx_uart_stop_tx now checks for incomplete transmission AND whether TC interrupts are enabled before bailing to be retriggered. This makes sure the state machine handling is reached, and is properly set to WAIT_AFTER_SEND.
Test IDs:	None available
Cross References:	Common Vulnerability Exposure (CVE) ID: CVE-2023-52456 https://git.kernel.org/stable/c/63ee7be01a3f7d28b1ea8b8d7944f12bb7b0ed06 https://git.kernel.org/stable/c/63ee7be01a3f7d28b1ea8b8d7944f12bb7b0ed06 https://git.kernel.org/stable/c/6e04a9d30509fb53ba6df5d655ed61d607a7cfda https://git.kernel.org/stable/c/6e04a9d30509fb53ba6df5d655ed61d607a7cfda https://git.kernel.org/stable/c/763cd68746317b5d746dc2649a3295c1efb41181 https://git.kernel.org/stable/c/763cd68746317b5d746dc2649a3295c1efb41181 https://git.kernel.org/stable/c/78d60dae9a0c9f09aa3d6477c94047df2fe6f7b0 https://git.kernel.org/stable/c/78d60dae9a0c9f09aa3d6477c94047df2fe6f7b0 https://git.kernel.org/stable/c/9a662d06c22ddfa371958c2071dc350436be802b https://git.kernel.org/stable/c/9a662d06c22ddfa371958c2071dc350436be802b https://git.kernel.org/stable/c/ff168d4fdb0e1ba35fb413a749b3d6cce918ec19 https://git.kernel.org/stable/c/ff168d4fdb0e1ba35fb413a749b3d6cce918ec19