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usb: renesas_usbhs: prevent NULL pointer crash 

usbhs_status_get_each_irq/usbhs_irq_callback_update might be called
with mod == NULL

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Kuninori Morimoto 2011-04-28 16:41:07 +09:00 committed by Greg Kroah-Hartman
parent 6e267da8f1
commit 5ea68d541d
1 changed files with 19 additions and 15 deletions
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34
drivers/usb/renesas_usbhs/mod.c
View File

@ -179,15 +179,17 @@ static void usbhs_status_get_each_irq(struct usbhs_priv *priv,
state->intsts0 = usbhs_read(priv, INTSTS0);
state->intsts1 = usbhs_read(priv, INTSTS1);
state->brdysts = usbhs_read(priv, BRDYSTS);
state->nrdysts = usbhs_read(priv, NRDYSTS);
state->bempsts = usbhs_read(priv, BEMPSTS);
state->dvstctr = usbhs_read(priv, DVSTCTR);
/* mask */
state->bempsts &= mod->irq_bempsts;
state->brdysts &= mod->irq_brdysts;
if (mod) {
state->brdysts = usbhs_read(priv, BRDYSTS);
state->nrdysts = usbhs_read(priv, NRDYSTS);
state->bempsts = usbhs_read(priv, BEMPSTS);
state->bempsts &= mod->irq_bempsts;
state->brdysts &= mod->irq_brdysts;
}
}
/*
@ -259,17 +261,19 @@ void usbhs_irq_callback_update(struct usbhs_priv *priv, struct usbhs_mod *mod)
* but "mod->irq_dev_state" will be called.
*/
if (mod->irq_ctrl_stage)
intenb0 |= CTRE;
if (mod) {
if (mod->irq_ctrl_stage)
intenb0 |= CTRE;
if (mod->irq_empty && mod->irq_bempsts) {
usbhs_write(priv, BEMPENB, mod->irq_bempsts);
intenb0 |= BEMPE;
}
if (mod->irq_empty && mod->irq_bempsts) {
usbhs_write(priv, BEMPENB, mod->irq_bempsts);
intenb0 |= BEMPE;
}
if (mod->irq_ready && mod->irq_brdysts) {
usbhs_write(priv, BRDYENB, mod->irq_brdysts);
intenb0 |= BRDYE;
if (mod->irq_ready && mod->irq_brdysts) {
usbhs_write(priv, BRDYENB, mod->irq_brdysts);
intenb0 |= BRDYE;
}
}
usbhs_write(priv, INTENB0, intenb0);