6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Harshit Mogalapalli <harshit.m.mogalapalli@xxxxxxxxxx>
[ Upstream commit 5976a28b344ecb6810882a01b76a320cac21d307 ]
There are two problems in lsdc_pixel_pll_setup()
1. If kzalloc() fails then call iounmap() to release the resources.
2. Both kzalloc and ioremap does not return error pointers on failure, so
using IS_ERR_OR_NULL() checks is a bit confusing and not very right,
fix this by changing those to NULL checks instead.
Fixes: f39db26c5428 ("drm: Add kms driver for loongson display controller")
Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@xxxxxxxxxx>
Reviewed-by: Sui Jingfeng <suijingfeng@xxxxxxxxxxx>
Signed-off-by: Sui Jingfeng <sui.jingfeng@xxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20230720123950.543082-1-harshit.m.mogalapalli@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/gpu/drm/loongson/lsdc_pixpll.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/loongson/lsdc_pixpll.c b/drivers/gpu/drm/loongson/lsdc_pixpll.c
index 04c15b4697e21..2609a2256da4b 100644
--- a/drivers/gpu/drm/loongson/lsdc_pixpll.c
+++ b/drivers/gpu/drm/loongson/lsdc_pixpll.c
@@ -120,12 +120,14 @@ static int lsdc_pixel_pll_setup(struct lsdc_pixpll * const this)
struct lsdc_pixpll_parms *pparms;
this->mmio = ioremap(this->reg_base, this->reg_size);
- if (IS_ERR_OR_NULL(this->mmio))
+ if (!this->mmio)
return -ENOMEM;
pparms = kzalloc(sizeof(*pparms), GFP_KERNEL);
- if (IS_ERR_OR_NULL(pparms))
+ if (!pparms) {
+ iounmap(this->mmio);
return -ENOMEM;
+ }
pparms->ref_clock = LSDC_PLL_REF_CLK_KHZ;
--
2.42.0
