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tty: xilinx_uartps: split sysrq handling

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BugLink: https://bugs.launchpad.net/bugs/2114239

commit b06f388994500297bb91be60ffaf6825ecfd2afe upstream.

lockdep detects the following circular locking dependency:

CPU 0                      CPU 1
========================== ============================
cdns_uart_isr()            printk()
  uart_port_lock(port)       console_lock()
			     cdns_uart_console_write()
                               if (!port->sysrq)
                                 uart_port_lock(port)
  uart_handle_break()
    port->sysrq = ...
  uart_handle_sysrq_char()
    printk()
      console_lock()

The fixed commit attempts to avoid this situation by only taking the
port lock in cdns_uart_console_write if port->sysrq unset. However, if
(as shown above) cdns_uart_console_write runs before port->sysrq is set,
then it will try to take the port lock anyway. This may result in a
deadlock.

Fix this by splitting sysrq handling into two parts. We use the prepare
helper under the port lock and defer handling until we release the lock.

Fixes: 74ea66d4ca ("tty: xuartps: Improve sysrq handling")
Signed-off-by: Sean Anderson <sean.anderson@linux.dev>
Cc: stable@vger.kernel.org # c980248179: serial: xilinx_uartps: Use port lock wrappers
Acked-by: John Ogness <john.ogness@linutronix.de>
Link: https://lore.kernel.org/r/20250110213822.2107462-1-sean.anderson@linux.dev
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Noah Wager <noah.wager@canonical.com>
Signed-off-by: Mehmet Basaran <mehmet.basaran@canonical.com>
This commit is contained in:
Sean Anderson
2025-01-10 16:38:22 -05:00
committed by Mehmet Basaran
parent f1966cffdc
commit e728c55f61
1 changed files with 3 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/tty/serial/xilinx_uartps.c
+3 -5
View File
@@ -268,7 +268,7 @@ static void cdns_uart_handle_rx(void *dev_id, unsigned int isrstatus)
continue;
}
if (uart_handle_sysrq_char(port, data))
if (uart_prepare_sysrq_char(port, data))
continue;
if (is_rxbs_support) {
@@ -369,7 +369,7 @@ static irqreturn_t cdns_uart_isr(int irq, void *dev_id)
!(readl(port->membase + CDNS_UART_CR) & CDNS_UART_CR_RX_DIS))
cdns_uart_handle_rx(dev_id, isrstatus);
uart_port_unlock(port);
uart_unlock_and_check_sysrq(port);
return IRQ_HANDLED;
}
@@ -1229,9 +1229,7 @@ static void cdns_uart_console_write(struct console *co, const char *s,
unsigned int imr, ctrl;
int locked = 1;
if (port->sysrq)
locked = 0;
else if (oops_in_progress)
if (oops_in_progress)
locked = uart_port_trylock_irqsave(port, &flags);
else
uart_port_lock_irqsave(port, &flags);