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can: mcp251x: avoid write to error flag register if it's unnecessary

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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>
This commit is contained in:
Ed Spiridonov 2016-03-04 09:07:27 +03:00 committed by Marc Kleine-Budde
parent c1bb0a5588
commit d694b06c42
1 changed files with 1 additions and 1 deletions
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2
drivers/net/can/spi/mcp251x.c
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@ -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 */