tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 916a3b0fc1206f7e7ae8d00a21a3114b1dc67794 commit: 8e20fc3917117b42de316e87f073a1ca43d94c9f serial_core: Move sysrq functions from header file date: 6 months ago config: arm64-randconfig-s032-20200628 (attached as .config) compiler: aarch64-linux-gcc (GCC) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.2-dirty git checkout 8e20fc3917117b42de316e87f073a1ca43d94c9f # save the attached .config to linux build tree make W=1 C=1 ARCH=arm64 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'
If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <[email protected]> sparse warnings: (new ones prefixed by >>) >> drivers/tty/serial/8250/8250_omap.c:1044:12: sparse: sparse: context >> imbalance in 'omap_8250_dma_handle_irq' - different lock contexts for basic >> block vim +/omap_8250_dma_handle_irq +1044 drivers/tty/serial/8250/8250_omap.c 33d9b8b23a73d5 Peter Hurley 2016-04-09 1038 77285243a68fec Sebastian Andrzej Siewior 2014-09-29 1039 /* 77285243a68fec Sebastian Andrzej Siewior 2014-09-29 1040 * This is mostly serial8250_handle_irq(). We have a slightly different DMA 77285243a68fec Sebastian Andrzej Siewior 2014-09-29 1041 * hoook for RX/TX and need different logic for them in the ISR. Therefore we 77285243a68fec Sebastian Andrzej Siewior 2014-09-29 1042 * use the default routine in the non-DMA case and this one for with DMA. 77285243a68fec Sebastian Andrzej Siewior 2014-09-29 1043 */ 77285243a68fec Sebastian Andrzej Siewior 2014-09-29 @1044 static int omap_8250_dma_handle_irq(struct uart_port *port) 77285243a68fec Sebastian Andrzej Siewior 2014-09-29 1045 { 77285243a68fec Sebastian Andrzej Siewior 2014-09-29 1046 struct uart_8250_port *up = up_to_u8250p(port); 77285243a68fec Sebastian Andrzej Siewior 2014-09-29 1047 unsigned char status; 77285243a68fec Sebastian Andrzej Siewior 2014-09-29 1048 unsigned long flags; 77285243a68fec Sebastian Andrzej Siewior 2014-09-29 1049 u8 iir; 77285243a68fec Sebastian Andrzej Siewior 2014-09-29 1050 77285243a68fec Sebastian Andrzej Siewior 2014-09-29 1051 serial8250_rpm_get(up); 77285243a68fec Sebastian Andrzej Siewior 2014-09-29 1052 77285243a68fec Sebastian Andrzej Siewior 2014-09-29 1053 iir = serial_port_in(port, UART_IIR); 77285243a68fec Sebastian Andrzej Siewior 2014-09-29 1054 if (iir & UART_IIR_NO_INT) { 77285243a68fec Sebastian Andrzej Siewior 2014-09-29 1055 serial8250_rpm_put(up); 77285243a68fec Sebastian Andrzej Siewior 2014-09-29 1056 return 0; 77285243a68fec Sebastian Andrzej Siewior 2014-09-29 1057 } 77285243a68fec Sebastian Andrzej Siewior 2014-09-29 1058 77285243a68fec Sebastian Andrzej Siewior 2014-09-29 1059 spin_lock_irqsave(&port->lock, flags); 77285243a68fec Sebastian Andrzej Siewior 2014-09-29 1060 77285243a68fec Sebastian Andrzej Siewior 2014-09-29 1061 status = serial_port_in(port, UART_LSR); 77285243a68fec Sebastian Andrzej Siewior 2014-09-29 1062 77285243a68fec Sebastian Andrzej Siewior 2014-09-29 1063 if (status & (UART_LSR_DR | UART_LSR_BI)) { 33d9b8b23a73d5 Peter Hurley 2016-04-09 1064 if (handle_rx_dma(up, iir)) { 77285243a68fec Sebastian Andrzej Siewior 2014-09-29 1065 status = serial8250_rx_chars(up, status); 33d9b8b23a73d5 Peter Hurley 2016-04-09 1066 omap_8250_rx_dma(up); 77285243a68fec Sebastian Andrzej Siewior 2014-09-29 1067 } 77285243a68fec Sebastian Andrzej Siewior 2014-09-29 1068 } 77285243a68fec Sebastian Andrzej Siewior 2014-09-29 1069 serial8250_modem_status(up); 77285243a68fec Sebastian Andrzej Siewior 2014-09-29 1070 if (status & UART_LSR_THRE && up->dma->tx_err) { 77285243a68fec Sebastian Andrzej Siewior 2014-09-29 1071 if (uart_tx_stopped(&up->port) || 77285243a68fec Sebastian Andrzej Siewior 2014-09-29 1072 uart_circ_empty(&up->port.state->xmit)) { 77285243a68fec Sebastian Andrzej Siewior 2014-09-29 1073 up->dma->tx_err = 0; 77285243a68fec Sebastian Andrzej Siewior 2014-09-29 1074 serial8250_tx_chars(up); 77285243a68fec Sebastian Andrzej Siewior 2014-09-29 1075 } else { 77285243a68fec Sebastian Andrzej Siewior 2014-09-29 1076 /* 77285243a68fec Sebastian Andrzej Siewior 2014-09-29 1077 * try again due to an earlier failer which 77285243a68fec Sebastian Andrzej Siewior 2014-09-29 1078 * might have been resolved by now. 77285243a68fec Sebastian Andrzej Siewior 2014-09-29 1079 */ a86f50ed35a885 Peter Hurley 2016-04-09 1080 if (omap_8250_tx_dma(up)) 77285243a68fec Sebastian Andrzej Siewior 2014-09-29 1081 serial8250_tx_chars(up); 77285243a68fec Sebastian Andrzej Siewior 2014-09-29 1082 } 77285243a68fec Sebastian Andrzej Siewior 2014-09-29 1083 } 77285243a68fec Sebastian Andrzej Siewior 2014-09-29 1084 596f63da42b928 Douglas Anderson 2018-10-30 1085 uart_unlock_and_check_sysrq(port, flags); 77285243a68fec Sebastian Andrzej Siewior 2014-09-29 1086 serial8250_rpm_put(up); 77285243a68fec Sebastian Andrzej Siewior 2014-09-29 1087 return 1; 77285243a68fec Sebastian Andrzej Siewior 2014-09-29 1088 } 0a0661ddb8fc92 Sebastian Andrzej Siewior 2014-09-29 1089 :::::: The code at line 1044 was first introduced by commit :::::: 77285243a68fec6852041d1db0d5587684b9dc48 tty: serial: 8250: omap: add custom irq handling :::::: TO: Sebastian Andrzej Siewior <[email protected]> :::::: CC: Greg Kroah-Hartman <[email protected]> --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/[email protected]
.config.gz
Description: application/gzip
