From 40a4db81900d58050e42d354db4e2e0026714fd0 Mon Sep 17 00:00:00 2001 From: Harshit Mogalapalli Date: Thu, 20 Jul 2023 05:39:50 -0700 Subject: [PATCH] drm/loongson: Fix error handling in lsdc_pixel_pll_setup() [ 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 Reviewed-by: Sui Jingfeng Signed-off-by: Sui Jingfeng Link: https://patchwork.freedesktop.org/patch/msgid/20230720123950.543082-1-harshit.m.mogalapalli@oracle.com Signed-off-by: Sasha Levin --- 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 04c15b4..2609a22 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; -- 2.7.4