On Tue, 2 Apr 2024 19:35:41 +0530
Harshit Mogalapalli <harshit.m.mogalapalli@xxxxxxxxxx> wrote:
> Hi Boris,
> On 02/04/24 19:32, Boris Brezillon wrote:
> > On Tue, 2 Apr 2024 06:47:08 -0700
> > Harshit Mogalapalli <harshit.m.mogalapalli@xxxxxxxxxx> wrote:
> >
> >> 1. The devm_drm_dev_alloc() function returns error pointers.
> >> Update the error handling to check for error pointers instead of NULL.
> >> 2. Currently panthor_vm_get_heap_pool() returns both ERR_PTR() and
> >> NULL(when create is false and if there is no poool attached to the
> >> VM)
> >> - Change the function to return error pointers, when pool is
> >> NULL return -ENOENT
> >> - Also handle the callers to check for IS_ERR() on failure.
> >>
> >> Fixes: 4bdca1150792 ("drm/panthor: Add the driver frontend block")
> >> Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@xxxxxxxxxx>
> >> ---
> >> This is spotted by smatch and the patch is only compile tested
> >>
> >> v1->v2: Fix the function panthor_vm_get_heap_pool() to only return error
> >> pointers and handle the caller sites [Suggested by Boris Brezillon]
> >> - Also merge these IS_ERR() vs NULL bugs into same patch
> >> ---
> >> drivers/gpu/drm/panthor/panthor_drv.c | 6 +++---
> >> drivers/gpu/drm/panthor/panthor_mmu.c | 2 ++
> >> drivers/gpu/drm/panthor/panthor_sched.c | 2 +-
> >> 3 files changed, 6 insertions(+), 4 deletions(-)
> >>
> >> diff --git a/drivers/gpu/drm/panthor/panthor_drv.c b/drivers/gpu/drm/panthor/panthor_drv.c
> >> index 11b3ccd58f85..c8374cd4a30d 100644
> >> --- a/drivers/gpu/drm/panthor/panthor_drv.c
> >> +++ b/drivers/gpu/drm/panthor/panthor_drv.c
> >> @@ -1090,8 +1090,8 @@ static int panthor_ioctl_tiler_heap_destroy(struct drm_device *ddev, void *data,
> >> return -EINVAL;
> >>
> >> pool = panthor_vm_get_heap_pool(vm, false);
> >> - if (!pool) {
> >> - ret = -EINVAL;
> >> + if (IS_ERR(pool)) {
> >> + ret = PTR_ERR(pool);
> >> goto out_put_vm;
> >> }
> >>
> >> @@ -1385,7 +1385,7 @@ static int panthor_probe(struct platform_device *pdev)
> >>
> >> ptdev = devm_drm_dev_alloc(&pdev->dev, &panthor_drm_driver,
> >> struct panthor_device, base);
> >> - if (!ptdev)
> >> + if (IS_ERR(ptdev))
> >> return -ENOMEM;
> >>
> >
> > Sorry, that one deserves a separate patch.
> >
>
> Ah okay, I was confused about the same.
> So I will send a V3 removing that part and could you please use the
> independent patch that I sent before ?
>
> https://lore.kernel.org/all/20240402104041.1689951-1-harshit.m.mogalapalli@xxxxxxxxxx/
Yes, I already added my R-b on that one.
