Re: [PATCH] OPP: Fix _set_required_opps when opp is NULL
From: Viresh Kumar
Date: Thu Dec 28 2023 - 00:29:28 EST
On 27-12-23, 12:41, Bryan O'Donoghue wrote:
> Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@xxxxxxxxxx>
> Tested-by: Bryan O'Donoghue <bryan.odonoghue@xxxxxxxxxx>
Thanks Bryan. Here is the merged commit:
From: Bryan O'Donoghue <bryan.odonoghue@xxxxxxxxxx>
Date: Sat, 23 Dec 2023 02:34:21 +0000
Subject: [PATCH] OPP: Fix _set_required_opps when opp is NULL
_set_required_opps can be called with opp NULL in _disable_opp_table().
commit e37440e7e2c2 ("OPP: Call dev_pm_opp_set_opp() for required OPPs")
requires the opp pointer to be non-NULL to function.
[ 81.253439] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000048
[ 81.438407] Hardware name: Qualcomm Technologies, Inc. Robotics RB5 (DT)
[ 81.445296] Workqueue: pm pm_runtime_work
[ 81.449446] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[ 81.456609] pc : _set_required_opps+0x178/0x28c
[ 81.461288] lr : _set_required_opps+0x178/0x28c
[ 81.465962] sp : ffff80008078bb00
[ 81.469375] x29: ffff80008078bb00 x28: ffffd1cd71bfe308 x27: 0000000000000000
[ 81.476730] x26: ffffd1cd70ebc578 x25: ffffd1cd70a08710 x24: 00000000ffffffff
[ 81.484083] x23: 00000000ffffffff x22: 0000000000000000 x21: ffff56ff892b3c48
[ 81.491435] x20: ffff56f1071c10 x19: 0000000000000000 x18: ffffffffffffffff
[ 81.498788] x17: 2030207865646e69 x16: 2030303131207370 x15: 706f5f6465726975
[ 81.506141] x14: 7165725f7465735f x13: ffff5700f5c00000 x12: 00000000000008ac
[ 81.513495] x11: 00000000000002e4 x10: ffff5700f6700000 x9 : ffff5700f5c00000
[ 81.520848] x8 : 00000000fffdffff x7 : ffff5700f6700000 x6 : 80000000fffe0000
[ 81.528200] x5 : ffff5700fef40d08 x4 : 0000000000000000 x3 : 0000000000000000
[ 81.535551] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff56ff81298f80
[ 81.542904] Call trace:
[ 81.545437] _set_required_opps+0x178/0x28c
[ 81.549754] _set_opp+0x3fc/0x5c0
[ 81.553181] dev_pm_opp_set_rate+0x90/0x26c
[ 81.557498] core_power_v4+0x44/0x15c [venus_core]
[ 81.562509] venus_runtime_suspend+0x40/0xd0 [venus_core]
[ 81.568135] pm_generic_runtime_suspend+0x2c/0x44
[ 81.572983] __rpm_callback+0x48/0x1d8
[ 81.576852] rpm_callback+0x6c/0x78
[ 81.580453] rpm_suspend+0x10c/0x570
[ 81.584143] pm_runtime_work+0xc4/0xc8
[ 81.588011] process_one_work+0x138/0x244
[ 81.592153] worker_thread+0x320/0x438
[ 81.596021] kthread+0x110/0x114
[ 81.599355] ret_from_fork+0x10/0x20
[ 81.603052] Code: f10000ff fa5410e0 54fffbe1 97f05ae8 (f94026c5)
[ 81.609317] ---[ end trace 0000000000000000 ]---
Fix it.
Fixes: e37440e7e2c2 ("OPP: Call dev_pm_opp_set_opp() for required OPPs")
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@xxxxxxxxxx>
[ Viresh: Implemented the fix differently ]
Signed-off-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@xxxxxxxxxx>
Tested-by: Bryan O'Donoghue <bryan.odonoghue@xxxxxxxxxx>
---
drivers/opp/core.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index 49b429984bdb..a6e80f566e9b 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -1066,6 +1066,7 @@ static int _set_required_opps(struct device *dev, struct opp_table *opp_table,
struct dev_pm_opp *opp, bool up)
{
struct device **devs = opp_table->required_devs;
+ struct dev_pm_opp *required_opp;
int index, target, delta, ret;
if (!devs)
@@ -1088,7 +1089,9 @@ static int _set_required_opps(struct device *dev, struct opp_table *opp_table,
while (index != target) {
if (devs[index]) {
- ret = dev_pm_opp_set_opp(devs[index], opp->required_opps[index]);
+ required_opp = opp ? opp->required_opps[index] : NULL;
+
+ ret = dev_pm_opp_set_opp(devs[index], required_opp);
if (ret)
return ret;
}