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media: staging: imgu: do not hold spinlock during freeing mmu page table

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[ Upstream commit e1ebe9f9c88e5a78fcc4670a9063c9b3cd87dda4 ]

ImgU need set the mmu page table in memory as uncached, and set back
to write-back when free the page table by set_memory_wb(),
set_memory_wb() can not do flushing without interrupt, so the spinlock
should not be hold during ImgU page alloc and free, the interrupt
should be enabled during memory cache flush.

This patch release spinlock before freeing pages table.

Signed-off-by: Bingbu Cao <bingbu.cao@intel.com>
Reviewed-by: Tomasz Figa <tfiga@chromium.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Bingbu Cao 2020-03-24 05:16:48 +01:00 • committed by Greg Kroah-Hartman
commit ff41c7b3c7
1 changed files with 6 additions and 4 deletions
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10
drivers/staging/media/ipu3/ipu3-mmu.c
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@ -174,8 +174,10 @@ static u32 *imgu_mmu_get_l2pt(struct imgu_mmu *mmu, u32 l1pt_idx)
spin_lock_irqsave(&mmu->lock, flags);
l2pt = mmu->l2pts[l1pt_idx];
if (l2pt)
goto done;
if (l2pt) {
spin_unlock_irqrestore(&mmu->lock, flags);
return l2pt;
}
spin_unlock_irqrestore(&mmu->lock, flags);
@ -190,8 +192,9 @@ static u32 *imgu_mmu_get_l2pt(struct imgu_mmu *mmu, u32 l1pt_idx)
l2pt = mmu->l2pts[l1pt_idx];
if (l2pt) {
spin_unlock_irqrestore(&mmu->lock, flags);
imgu_mmu_free_page_table(new_l2pt);
goto done;
return l2pt;
}
l2pt = new_l2pt;
@ -200,7 +203,6 @@ static u32 *imgu_mmu_get_l2pt(struct imgu_mmu *mmu, u32 l1pt_idx)
pteval = IPU3_ADDR2PTE(virt_to_phys(new_l2pt));
mmu->l1pt[l1pt_idx] = pteval;
done:
spin_unlock_irqrestore(&mmu->lock, flags);
return l2pt;
}