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mrf24j40: avoid uninitialized byte in SPI transfer to radio. 

isr function issues SPI read command to mrf to obtain INTSTAT.
SPI transfer is 2 bytes, but value of 2nd byte is not defined.
This had the effect that only the first ISR worked as intended. The
second ISR read incorrect INTSTAT values. Observed on Raspberry PI B+.

Signed-off-by: Walter Mack <wmack@componentsw.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Walter Mack 2016-07-11 20:02:16 -07:00 committed by Marcel Holtmann
parent 12d868964f
commit 3faf564372
1 changed files with 2 additions and 0 deletions
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2
drivers/net/ieee802154/mrf24j40.c
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@ -1054,6 +1054,8 @@ static irqreturn_t mrf24j40_isr(int irq, void *data)
disable_irq_nosync(irq);
devrec->irq_buf[0] = MRF24J40_READSHORT(REG_INTSTAT);
devrec->irq_buf[1] = 0;
/* Read the interrupt status */
ret = spi_async(devrec->spi, &devrec->irq_msg);
if (ret) {