serial: sh-sci: describe locking requirements for invalidating RXDMA

Wolfram Sang · gregkh · commit 8efc44054908 · 2024-05-10T11:48:33.000+01:00
Make sure everyone knows that calling this function needs protection. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Link: https://lore.kernel.org/r/20240506114016.30498-8-wsa+renesas@sang-engineering.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
@@ -1257,6 +1257,7 @@ static int sci_dma_rx_find_active(struct sci_port *s)
 	return -1;
 }
 
+/* Must only be called with uart_port_lock taken */
 static void sci_dma_rx_chan_invalidate(struct sci_port *s)
 {
 	unsigned int i;

Original file line number	Diff line number	Diff line change
`@@ -1257,6 +1257,7 @@ static int sci_dma_rx_find_active(struct sci_port *s)`
`1257`	`1257`	`return -1;`
`1258`	`1258`	`}`
`1259`	`1259`
	`1260`	`+/* Must only be called with uart_port_lock taken */`
`1260`	`1261`	`static void sci_dma_rx_chan_invalidate(struct sci_port *s)`
`1261`	`1262`	`{`
`1262`	`1263`	`unsigned int i;`