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[ARM] Fix i2c-pxa slave mode support 

i2c-pxa times out when trying to enable slave mode due to an
incorrect test.  Also, check that i2c->slave is non-NULL
before dereferencing it.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2006-10-28 22:30:17 +01:00 committed by Russell King
parent e0f205d9c6
commit 84b5abe69f
1 changed files with 6 additions and 2 deletions
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8
drivers/i2c/busses/i2c-pxa.c
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@ -272,7 +272,8 @@ static int i2c_pxa_wait_slave(struct pxa_i2c *i2c)
dev_dbg(&i2c->adap.dev, "%s: %ld: ISR=%08x, ICR=%08x, IBMR=%02x\n",
__func__, (long)jiffies, ISR, ICR, IBMR);
if ((ISR & (ISR_UB|ISR_IBB|ISR_SAD)) == ISR_SAD ||
if ((ISR & (ISR_UB|ISR_IBB)) == 0 ||
(ISR & ISR_SAD) != 0 ||
(ICR & ICR_SCLE) == 0) {
if (i2c_debug > 1)
dev_dbg(&i2c->adap.dev, "%s: done\n", __func__);
@ -492,7 +493,10 @@ static void i2c_pxa_slave_txempty(struct pxa_i2c *i2c, u32 isr)
if (isr & ISR_BED) {
/* what should we do here? */
} else {
int ret = i2c->slave->read(i2c->slave->data);
int ret = 0;
if (i2c->slave != NULL)
ret = i2c->slave->read(i2c->slave->data);
IDBR = ret;
ICR |= ICR_TB; /* allow next byte */