| Message ID | 20210414064724.27068-1-zhuguangqing83@gmail.com (mailing list archive) |
|---|---|
| State | Not Applicable, archived |
| Headers | show |
| Series | power: supply: cpcap-battery: fix invalid usage of list cursor | expand |
[+Cc Tony] Hi, On Wed, Apr 14, 2021 at 02:47:24PM +0800, zhuguangqing83@gmail.com wrote: > From: Guangqing Zhu <zhuguangqing83@gmail.com> > > Fix invalid usage of a list_for_each_entry in cpcap_battery_irq_thread(). > When list is empty or if the list is completely traversed (without breaking > from the loop on one of the entries) then the list cursor does not point > to a valid entry and therefore should not be used. "if (!d)" will never > happen, maybe we should use "if (&d->node == &ddata->irq_list)". Commit message does not make sense. I think you meant to say: Empty list or fully traversed list points to list head, which is not NULL (and before the first element containing real data). > Fixes: 874b2adbed125 ("power: supply: cpcap-battery: Add a battery driver") > Signed-off-by: Guangqing Zhu <zhuguangqing83@gmail.com> > --- > drivers/power/supply/cpcap-battery.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/power/supply/cpcap-battery.c b/drivers/power/supply/cpcap-battery.c > index 6d5bcdb9f45d..8169dc71a786 100644 > --- a/drivers/power/supply/cpcap-battery.c > +++ b/drivers/power/supply/cpcap-battery.c > @@ -786,7 +786,7 @@ static irqreturn_t cpcap_battery_irq_thread(int irq, void *data) > break; > } > > - if (!d) > + if (&d->node == &ddata->irq_list) > return IRQ_NONE; Please use list_entry_is_head() instead of open coding it. > latest = cpcap_battery_latest(ddata); Thanks, -- Sebastian
diff --git a/drivers/power/supply/cpcap-battery.c b/drivers/power/supply/cpcap-battery.c index 6d5bcdb9f45d..8169dc71a786 100644 --- a/drivers/power/supply/cpcap-battery.c +++ b/drivers/power/supply/cpcap-battery.c @@ -786,7 +786,7 @@ static irqreturn_t cpcap_battery_irq_thread(int irq, void *data) break; } - if (!d) + if (&d->node == &ddata->irq_list) return IRQ_NONE; latest = cpcap_battery_latest(ddata);