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authorEd Spiridonov <edo.rus@gmail.com>2016-03-04 09:07:27 +0300
committerMarc Kleine-Budde <mkl@pengutronix.de>2016-03-04 10:45:17 +0300
commitd694b06c42a56c9610861ee0474b4d441af8ada6 (patch)
tree1988f2ad6c038661dd1b5a925b624dad908c1332 /drivers/net/can/spi/mcp251x.c
parentc1bb0a5588816ec26abc08aa9adcf90e32656781 (diff)
downloadlinux-d694b06c42a56c9610861ee0474b4d441af8ada6.tar.xz
can: mcp251x: avoid write to error flag register if it's unnecessary
Only two bits (RX0OVR and RX1OVR) are writable in EFLG, write is useless if these bits aren't set. Signed-off-by: Ed Spiridonov <edo.rus@gmail.com> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Diffstat (limited to 'drivers/net/can/spi/mcp251x.c')
-rw-r--r--drivers/net/can/spi/mcp251x.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/can/spi/mcp251x.c b/drivers/net/can/spi/mcp251x.c
index 575790e8a75a..74a7dfecee27 100644
--- a/drivers/net/can/spi/mcp251x.c
+++ b/drivers/net/can/spi/mcp251x.c
@@ -843,7 +843,7 @@ static irqreturn_t mcp251x_can_ist(int irq, void *dev_id)
if (clear_intf)
mcp251x_write_bits(spi, CANINTF, clear_intf, 0x00);
- if (eflag)
+ if (eflag & (EFLG_RX0OVR | EFLG_RX1OVR))
mcp251x_write_bits(spi, EFLG, eflag, 0x00);
/* Update can state */