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V4L/DVB (8071): tda10023: Fix possible kernel oops during initialisation 

If the i2c write fails during initialisation, an oops happens
because state->frontend.dvb is still undefined. Fixed.

Thanks to Sigmund Augdal for reporting this bug,
and to Hartmut Birr for suggesting the fix.

Thanks-to: Sigmund Augdal <sigmund@snap.tv>
Thanks-to: Hartmut Birr <e9hack@gmail.com>

Signed-off-by: Oliver Endriss <o.endriss@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Oliver Endriss 2008-06-19 22:45:55 -03:00 committed by Mauro Carvalho Chehab
parent ad907fa395
commit c9fa2b1eee
1 changed files with 12 additions and 8 deletions
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20
drivers/media/dvb/frontends/tda10023.c
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@ -116,9 +116,12 @@ static u8 tda10023_readreg (struct tda10023_state* state, u8 reg)
int ret;
ret = i2c_transfer (state->i2c, msg, 2);
if (ret != 2)
printk("DVB: TDA10023: %s: readreg error (ret == %i)\n",
__func__, ret);
if (ret != 2) {
int num = state->frontend.dvb ? state->frontend.dvb->num : -1;
printk(KERN_ERR "DVB: TDA10023(%d): %s: readreg error "
"(reg == 0x%02x, ret == %i)\n",
num, __func__, reg, ret);
}
return b1[0];
}
@ -129,11 +132,12 @@ static int tda10023_writereg (struct tda10023_state* state, u8 reg, u8 data)
int ret;
ret = i2c_transfer (state->i2c, &msg, 1);
if (ret != 1)
printk("DVB: TDA10023(%d): %s, writereg error "
if (ret != 1) {
int num = state->frontend.dvb ? state->frontend.dvb->num : -1;
printk(KERN_ERR "DVB: TDA10023(%d): %s, writereg error "
"(reg == 0x%02x, val == 0x%02x, ret == %i)\n",
state->frontend.dvb->num, __func__, reg, data, ret);
num, __func__, reg, data, ret);
}
return (ret != 1) ? -EREMOTEIO : 0;
}
@ -464,7 +468,7 @@ struct dvb_frontend* tda10023_attach(const struct tda1002x_config* config,
int i;
/* allocate memory for the internal state */
state = kmalloc(sizeof(struct tda10023_state), GFP_KERNEL);
state = kzalloc(sizeof(struct tda10023_state), GFP_KERNEL);
if (state == NULL) goto error;
/* setup the state */