| Message ID | 20160620105056.25843-3-m.niestroj@grinn-global.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Mon, Jun 20, 2016 at 12:50 PM, Marcin Niestroj <m.niestroj@grinn-global.com> wrote: > This bug leads to: > > [ 1.906411] Unable to handle kernel NULL pointer dereference at virtual address 0000000c > [ 1.914878] pgd = c0004000 > [ 1.917786] [0000000c] *pgd=00000000 > [ 1.921536] Internal error: Oops: 5 [#1] SMP ARM > [ 1.926357] Modules linked in: > [ 1.929556] CPU: 0 PID: 14 Comm: kworker/0:1 Not tainted 4.4.5 #18 > [ 1.936006] Hardware name: Generic AM33XX (Flattened Device Tree) > [ 1.942383] Workqueue: events power_supply_changed_work > [ 1.947842] task: de2c41c0 ti: de2c8000 task.ti: de2c8000 > [ 1.953483] PC is at tps65217_ac_get_property+0x14/0x28 > [ 1.958937] LR is at tps65217_ac_get_property+0x10/0x28 > > Driver was trying to use drv_data in property get handler. However drv_data > was not set, so it caused NULL pointer dereference. This patch properly > sets drv_data during probe by power_supply_config parameter, so the > property get handler works as desired. > > Signed-off-by: Marcin Niestroj <m.niestroj@grinn-global.com> > --- > Changes v1 -> v4: none This should crash on first try (get_property() is called just after power supply register)... I wonder how was it working before... Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Fixes: 3636859b280c ("power_supply: Add support for tps65217-charger.") Cc: <stable@vger.kernel.org> Best regards, Krzysztof -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/power/tps65217_charger.c b/drivers/power/tps65217_charger.c index d9f5673..73dfae4 100644 --- a/drivers/power/tps65217_charger.c +++ b/drivers/power/tps65217_charger.c @@ -197,6 +197,7 @@ static int tps65217_charger_probe(struct platform_device *pdev) { struct tps65217 *tps = dev_get_drvdata(pdev->dev.parent); struct tps65217_charger *charger; + struct power_supply_config cfg = {}; int ret; dev_dbg(&pdev->dev, "%s\n", __func__); @@ -208,9 +209,12 @@ static int tps65217_charger_probe(struct platform_device *pdev) charger->tps = tps; charger->dev = &pdev->dev; + cfg.of_node = pdev->dev.of_node; + cfg.drv_data = charger; + charger->ac = devm_power_supply_register(&pdev->dev, &tps65217_charger_desc, - NULL); + &cfg); if (IS_ERR(charger->ac)) { dev_err(&pdev->dev, "failed: power supply register\n"); return PTR_ERR(charger->ac);
This bug leads to: [ 1.906411] Unable to handle kernel NULL pointer dereference at virtual address 0000000c [ 1.914878] pgd = c0004000 [ 1.917786] [0000000c] *pgd=00000000 [ 1.921536] Internal error: Oops: 5 [#1] SMP ARM [ 1.926357] Modules linked in: [ 1.929556] CPU: 0 PID: 14 Comm: kworker/0:1 Not tainted 4.4.5 #18 [ 1.936006] Hardware name: Generic AM33XX (Flattened Device Tree) [ 1.942383] Workqueue: events power_supply_changed_work [ 1.947842] task: de2c41c0 ti: de2c8000 task.ti: de2c8000 [ 1.953483] PC is at tps65217_ac_get_property+0x14/0x28 [ 1.958937] LR is at tps65217_ac_get_property+0x10/0x28 Driver was trying to use drv_data in property get handler. However drv_data was not set, so it caused NULL pointer dereference. This patch properly sets drv_data during probe by power_supply_config parameter, so the property get handler works as desired. Signed-off-by: Marcin Niestroj <m.niestroj@grinn-global.com> --- Changes v1 -> v4: none drivers/power/tps65217_charger.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)