On 11/5/18 6:58 PM, He, Bo wrote:
Hi,
I submit the patch based on tag v4.19.
Please don't post on mailing lists.
-----Original Message-----
From: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>
Sent: Tuesday, November 6, 2018 1:02 AM
To: He, Bo <bo.he@xxxxxxxxx>; alsa-devel@xxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx
Cc: liam.r.girdwood@xxxxxxxxxxxxxxx; perex@xxxxxxxx; tiwai@xxxxxxxx; Singh, Guneshwor O <guneshwor.o.singh@xxxxxxxxx>; Periyasamy, SriramX <sriramx.periyasamy@xxxxxxxxx>; Kale, Sanyog R <sanyog.r.kale@xxxxxxxxx>; Kesapragada, Pardha Saradhi <pardha.saradhi.kesapragada@xxxxxxxxx>; kuninori.morimoto.gx@xxxxxxxxxxx; guruprasadx.pawse@xxxxxxxxx; Ughreja, Rakesh A <rakesh.a.ughreja@xxxxxxxxx>; Prakash, Divya1 <divya1.prakash@xxxxxxxxx>; Diwakar, Praveen <praveen.diwakar@xxxxxxxxx>; Zhang, Yanmin <yanmin.zhang@xxxxxxxxx>
Subject: Re: [PATCH] fix the kernel panic due to wrong use the dev memory API
On 11/5/18 2:29 AM, He, Bo wrote:
skl->dais is allocated with devm_kcalloc, can't free with
the krealloc. Memory allocated with devm API is automatically freed on
driver detach, Like all other devres resources.
Refer to drivers/base/devres.c devm_kmalloc for more details.
What code are you looking at?
I see this in the Mark's tree
int skl_platform_register(struct device *dev) {
int ret;
struct snd_soc_dai_driver *dais;
int num_dais = ARRAY_SIZE(skl_platform_dai);
struct hdac_bus *bus = dev_get_drvdata(dev);
struct skl *skl = bus_to_skl(bus);
INIT_LIST_HEAD(&skl->ppl_list);
INIT_LIST_HEAD(&skl->bind_list);
skl->dais = kmemdup(skl_platform_dai, sizeof(skl_platform_dai),
GFP_KERNEL);
if (!skl->dais) {
ret = -ENOMEM;
goto err;
}
if (!skl->use_tplg_pcm) {
dais = krealloc(skl->dais, sizeof(skl_fe_dai) +
sizeof(skl_platform_dai), GFP_KERNEL);
No trace of devm as you mention it? I checked the Chrome tree as well and it's not there.
What am I missing?
The code is completely identical in v4.19. skl->dais is allocated with
kmemdup, which is a kmalloc+memcpy, i just don't understand what you are
trying to fix.
Signed-off-by: he, bo <bo.he@xxxxxxxxx>
---
sound/soc/intel/skylake/skl-pcm.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/sound/soc/intel/skylake/skl-pcm.c
b/sound/soc/intel/skylake/skl-pcm.c
index 823e391..928d314 100644
--- a/sound/soc/intel/skylake/skl-pcm.c
+++ b/sound/soc/intel/skylake/skl-pcm.c
@@ -1438,7 +1438,8 @@ int skl_platform_register(struct device *dev)
}
if (!skl->use_tplg_pcm) {
- dais = krealloc(skl->dais, sizeof(skl_fe_dai) +
+ devm_kfree(dev, skl->dais);
+ dais = devm_kcalloc(dev, skl->dais, sizeof(skl_fe_dai) +
sizeof(skl_platform_dai), GFP_KERNEL);
if (!dais) {
ret = -ENOMEM;
@@ -1472,7 +1473,5 @@ int skl_platform_unregister(struct device *dev)
}
}
- kfree(skl->dais);
-
return 0;
}
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