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drm/lima: fix shared irq handling on driver remove

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[ Upstream commit a6683c690bbfd1f371510cb051e8fa49507f3f5e ]

lima uses a shared interrupt, so the interrupt handlers must be prepared
to be called at any time. At driver removal time, the clocks are
disabled early and the interrupts stay registered until the very end of
the remove process due to the devm usage.
This is potentially a bug as the interrupts access device registers
which assumes clocks are enabled. A crash can be triggered by removing
the driver in a kernel with CONFIG_DEBUG_SHIRQ enabled.
This patch frees the interrupts at each lima device finishing callback
so that the handlers are already unregistered by the time we fully
disable clocks.

Signed-off-by: Erico Nunes <nunes.erico@gmail.com>
Signed-off-by: Qiang Yu <yuq825@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240401224329.1228468-2-nunes.erico@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Erico Nunes 2024-04-02 00:43:28 +02:00 committed by Greg Kroah-Hartman
parent 94ffdde326
commit 25d0d9b83d
3 changed files with 11 additions and 0 deletions
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2
drivers/gpu/drm/lima/lima_gp.c
View File

@ -324,7 +324,9 @@ int lima_gp_init(struct lima_ip *ip)
void lima_gp_fini(struct lima_ip *ip)
{
struct lima_device *dev = ip->dev;
devm_free_irq(dev->dev, ip->irq, ip);
}
int lima_gp_pipe_init(struct lima_device *dev)

5
drivers/gpu/drm/lima/lima_mmu.c
View File

@ -118,7 +118,12 @@ int lima_mmu_init(struct lima_ip *ip)
void lima_mmu_fini(struct lima_ip *ip)
{
struct lima_device *dev = ip->dev;
if (ip->id == lima_ip_ppmmu_bcast)
return;
devm_free_irq(dev->dev, ip->irq, ip);
}
void lima_mmu_flush_tlb(struct lima_ip *ip)

4
drivers/gpu/drm/lima/lima_pp.c
View File

@ -266,7 +266,9 @@ int lima_pp_init(struct lima_ip *ip)
void lima_pp_fini(struct lima_ip *ip)
{
struct lima_device *dev = ip->dev;
devm_free_irq(dev->dev, ip->irq, ip);
}
int lima_pp_bcast_resume(struct lima_ip *ip)
@ -299,7 +301,9 @@ int lima_pp_bcast_init(struct lima_ip *ip)
void lima_pp_bcast_fini(struct lima_ip *ip)
{
struct lima_device *dev = ip->dev;
devm_free_irq(dev->dev, ip->irq, ip);
}
static int lima_pp_task_validate(struct lima_sched_pipe *pipe,