Fix null pointer deference in clk_core_enable() when driver unbind is run
when there is an application has an active pipeline playing. At this point,
system hangs and needs to be power cycled.
s5p_mfc_release() gets called after s5p_mfc_final_pm() disables and does
clk_put() and s5p_mfc_release() attempts to enable clock and runs into
null pointer deference accessing invalid pointer. With this fix, null
pointer dereference is fixed and there is no hang.
Run unbind while the following pipeline is playing:
gst-launch-1.0 filesrc location=/home/odroid/GH3_MOV_HD.mp4 ! qtdemux !
h264parse ! v4l2video4dec ! videoconvert ! autovideosink
[ 4869.434709] Unable to handle kernel NULL pointer dereference at virtual addr0
[ 4869.441312] pgd = e91ac000
[ 4869.443996] [00000010] *pgd=ba4f7835
[ 4869.447552] Internal error: Oops: 17 [#1] PREEMPT SMP ARM
[ 4869.452921] Modules linked in: cpufreq_userspace cpufreq_powersave cpufreq_ca
[ 4869.471728] CPU: 4 PID: 2965 Comm: lt-gst-launch-1 Not tainted 4.7.0-rc2-nex0
[ 4869.481778] Hardware name: SAMSUNG EXYNOS (Flattened Device Tree)
[ 4869.487844] task: e91f1e00 ti: ed650000 task.ti: ed650000
[ 4869.493227] PC is at clk_core_enable+0x4c/0x98
[ 4869.497637] LR is at clk_core_enable+0x40/0x98
[ 4869.502056] pc : [<c0559714>] lr : [<c0559708>] psr: 60060093
[ 4869.502056] sp : ed651f18 ip : 00000000 fp : 002641b4
[ 4869.513493] r10: e9088c08 r9 : 00000008 r8 : ed676d68
[ 4869.518692] r7 : ee3ac000 r6 : bf16b3c0 r5 : a0060013 r4 : ee37a8c0
[ 4869.525191] r3 : 00000000 r2 : 00000001 r1 : 00000004 r0 : 00000000
[ 4869.531692] Flags: nZCv IRQs off FIQs on Mode SVC_32 ISA ARM Segment noe
[ 4869.538883] Control: 10c5387d Table: 691ac06a DAC: 00000051
[ 4869.544603] Process lt-gst-launch-1 (pid: 2965, stack limit = 0xed650210)
[ 4869.551361] Stack: (0xed651f18 to 0xed652000)
[ 4869.555694] 1f00: ee373
[ 4869.563841] 1f20: bf16b3c0 c055a0e0 ee3ac004 ed676c10 bf16b3c0 bf1558e0 e9080
[ 4869.571986] 1f40: 00000000 ee98a510 ee502e40 bf047344 e9088c00 ee986938 00004
[ 4869.580132] 1f60: 00000000 00000000 e91f2204 00000000 c0b4658c e91f1e00 c0100
[ 4869.588277] 1f80: 00000000 c0135c58 ed650000 c0107904 ed651fb0 00000006 c0104
[ 4869.596423] 1fa0: 00229500 b6581000 b6f7b544 c0107794 00000000 00000002 b6f90
[ 4869.604568] 1fc0: 00229500 b6581000 b6f7b544 00000006 0017b600 0002c038 00264
[ 4869.612714] 1fe0: 00000000 bee56ef0 00000000 b6d49612 00060030 00000006 00000
[ 4869.620865] [<c0559714>] (clk_core_enable) from [<c055a0e0>] (clk_enable+0x2)
[ 4869.628509] [<c055a0e0>] (clk_enable) from [<bf1558e0>] (s5p_mfc_release+0x3)
[ 4869.637111] [<bf1558e0>] (s5p_mfc_release [s5p_mfc]) from [<bf047344>] (v4l2)
[ 4869.646706] [<bf047344>] (v4l2_release [videodev]) from [<c01e4274>] (__fput)
[ 4869.654745] [<c01e4274>] (__fput) from [<c0135c58>] (task_work_run+0x94/0xc8)
[ 4869.661852] [<c0135c58>] (task_work_run) from [<c010a9d4>] (do_work_pending+)
[ 4869.669735] [<c010a9d4>] (do_work_pending) from [<c0107794>] (slow_work_pend)
[ 4869.677878] Code: ebffffef e3500000 18bd8070 e5943004 (e5933010)
Signed-off-by: Shuah Khan <shuahkh@xxxxxxxxxxxxxxx>
---
drivers/media/platform/s5p-mfc/s5p_mfc_pm.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/drivers/media/platform/s5p-mfc/s5p_mfc_pm.c b/drivers/media/platform/s5p-mfc/s5p_mfc_pm.c
index d011f30..d88f1ba 100644
--- a/drivers/media/platform/s5p-mfc/s5p_mfc_pm.c
+++ b/drivers/media/platform/s5p-mfc/s5p_mfc_pm.c
@@ -76,8 +76,10 @@ int s5p_mfc_init_pm(struct s5p_mfc_dev *dev)
err_s_clk:
clk_put(pm->clock);
+ pm->clock = NULL;
err_p_ip_clk:
clk_put(pm->clock_gate);
+ pm->clock_gate = NULL;
err_g_ip_clk:
return ret;
}
@@ -88,9 +90,11 @@ void s5p_mfc_final_pm(struct s5p_mfc_dev *dev)
!IS_ERR_OR_NULL(pm->clock)) {
clk_disable_unprepare(pm->clock);
clk_put(pm->clock);
+ pm->clock = NULL;
}
clk_unprepare(pm->clock_gate);
clk_put(pm->clock_gate);
+ pm->clock_gate = NULL;
#ifdef CONFIG_PM
pm_runtime_disable(pm->device);
#endif
@@ -98,12 +102,13 @@ void s5p_mfc_final_pm(struct s5p_mfc_dev *dev)
int s5p_mfc_clock_on(void)
{
- int ret;
+ int ret = 0;
#ifdef CLK_DEBUG
atomic_inc(&clk_ref);
mfc_debug(3, "+ %d\n", atomic_read(&clk_ref));
#endif
- ret = clk_enable(pm->clock_gate);
+ if (!IS_ERR_OR_NULL(pm->clock_gate))
+ ret = clk_enable(pm->clock_gate);
return ret;
}
@@ -113,7 +118,8 @@ void s5p_mfc_clock_off(void)
atomic_dec(&clk_ref);
mfc_debug(3, "- %d\n", atomic_read(&clk_ref));
#endif
- clk_disable(pm->clock_gate);
+ if (!IS_ERR_OR_NULL(pm->clock_gate))
+ clk_disable(pm->clock_gate);
}
int s5p_mfc_power_on(void)
--
2.7.4
--
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