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can: mcp251x: read-modify-write eflag only when needed
[cascardo/linux.git]
/
drivers
/
net
/
can
/
mcp251x.c
diff --git
a/drivers/net/can/mcp251x.c
b/drivers/net/can/mcp251x.c
index
9b3466a
..
7e2f951
100644
(file)
--- a/
drivers/net/can/mcp251x.c
+++ b/
drivers/net/can/mcp251x.c
@@
-785,7
+785,8
@@
static irqreturn_t mcp251x_can_ist(int irq, void *dev_id)
mcp251x_write_bits(spi, CANINTF, intf, 0x00);
- mcp251x_write_reg(spi, EFLG, 0x00);
+ if (eflag)
+ mcp251x_write_bits(spi, EFLG, eflag, 0x00);
/* Update can state */
if (eflag & EFLG_TXBO) {