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drm/loongson: Fix error handling in lsdc_pixel_pll_setup()

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[ Upstream commit 5976a28b34 ]

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: f39db26c54 ("drm: Add kms driver for loongson display controller")
Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>
Reviewed-by: Sui Jingfeng <suijingfeng@loongson.cn>
Signed-off-by: Sui Jingfeng <sui.jingfeng@linux.dev>
Link: https://patchwork.freedesktop.org/patch/msgid/20230720123950.543082-1-harshit.m.mogalapalli@oracle.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Harshit Mogalapalli 2023-07-20 05:39:50 -07:00 committed by Greg Kroah-Hartman
parent 2f56a02e2a
commit 40a4db8190
1 changed files with 4 additions and 2 deletions
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6
drivers/gpu/drm/loongson/lsdc_pixpll.c
View file

@ -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;