Commit 424d79183af0 ("serial: 8250_dw: Avoid "too much work" from bogus rx timeout interrupt")
added a bit check with quite a wide mask. To be concise with the other
similar calls in this driver, change it to mask against the flag we want to
check only. This thus removes a magic value/mask.
Some very minor code cleanups, such as including the bitops header for
DW_UART_MCR_SIRE, use the BIT() macro as suggested by checkpatc and
removed a whitespace to match other invocations.
Signed-off-by: Olliver Schinagl <oliver@xxxxxxxxxxx>
---
drivers/tty/serial/8250/8250_dw.c | 25 +++++++++++++------------
1 file changed, 13 insertions(+), 12 deletions(-)
diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
index e65808c482f1..49117bdc7b6a 100644
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -13,6 +13,7 @@
* LCR is written whilst busy. If it is, then a busy detect interrupt is
* raised, the LCR needs to be rewritten and the uart status register read.
*/
+#include <linux/bitops.h>
#include <linux/device.h>
#include <linux/io.h>
#include <linux/module.h>
@@ -39,16 +40,16 @@
/* Component Parameter Register bits */
#define DW_UART_CPR_ABP_DATA_WIDTH (3 << 0)
-#define DW_UART_CPR_AFCE_MODE (1 << 4)
-#define DW_UART_CPR_THRE_MODE (1 << 5)
-#define DW_UART_CPR_SIR_MODE (1 << 6)
-#define DW_UART_CPR_SIR_LP_MODE (1 << 7)
-#define DW_UART_CPR_ADDITIONAL_FEATURES (1 << 8)
-#define DW_UART_CPR_FIFO_ACCESS (1 << 9)
-#define DW_UART_CPR_FIFO_STAT (1 << 10)
-#define DW_UART_CPR_SHADOW (1 << 11)
-#define DW_UART_CPR_ENCODED_PARMS (1 << 12)
-#define DW_UART_CPR_DMA_EXTRA (1 << 13)
+#define DW_UART_CPR_AFCE_MODE BIT(4)
+#define DW_UART_CPR_THRE_MODE BIT(5)
+#define DW_UART_CPR_SIR_MODE BIT(6)
+#define DW_UART_CPR_SIR_LP_MODE BIT(7)
+#define DW_UART_CPR_ADDITIONAL_FEATURES BIT(8)
+#define DW_UART_CPR_FIFO_ACCESS BIT(9)
+#define DW_UART_CPR_FIFO_STAT BIT(10)
+#define DW_UART_CPR_SHADOW BIT(11)
+#define DW_UART_CPR_ENCODED_PARMS BIT(12)
+#define DW_UART_CPR_DMA_EXTRA BIT(13)
#define DW_UART_CPR_FIFO_MODE (0xff << 16)
/* Helper for fifo size calculation */
#define DW_UART_CPR_FIFO_SIZE(a) (((a >> 16) & 0xff) * 16)
@@ -217,12 +218,12 @@ static int dw8250_handle_irq(struct uart_port *p)
* This problem has only been observed so far when not in DMA mode
* so we limit the workaround only to non-DMA mode.
*/
- if (!up->dma && ((iir & 0x3f) == UART_IIR_RX_TIMEOUT)) {
+ if (!up->dma && ((iir & UART_IIR_RX_TIMEOUT) == UART_IIR_RX_TIMEOUT)) {
spin_lock_irqsave(&p->lock, flags);
status = p->serial_in(p, UART_LSR);
if (!(status & (UART_LSR_DR | UART_LSR_BI)))
- (void) p->serial_in(p, UART_RX);
+ (void)p->serial_in(p, UART_RX);
spin_unlock_irqrestore(&p->lock, flags);
}
--
2.11.0
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