msm: kgsl Fix stack exception occurring during axi error
When an axi error happens and the GPU is using IOMMU then a warning stack
trace was being reported. This is because during axi error interrupt
handling the IOMMU clocks were being turned on to read the current
pagetable base address. Switching the IOMMU clocks from interrupt context
is not allowed. Fix this by reporting the axi error and displaying 0
as the pagetable base address since we cannot read its value from
the axi error interrupt code.
Change-Id: If98538bc1b2df51a1b3632faf449d5d332bccc3e
Signed-off-by: Shubhraprakash Das <sadas@codeaurora.org>
diff --git a/drivers/gpu/msm/kgsl_iommu.c b/drivers/gpu/msm/kgsl_iommu.c
index b3f2d1e..e42c7b6 100644
--- a/drivers/gpu/msm/kgsl_iommu.c
+++ b/drivers/gpu/msm/kgsl_iommu.c
@@ -837,6 +837,10 @@
{
unsigned int pt_base;
struct kgsl_iommu *iommu = mmu->priv;
+ /* We cannot enable or disable the clocks in interrupt context, this
+ function is called from interrupt context if there is an axi error */
+ if (in_interrupt())
+ return 0;
/* Return the current pt base by reading IOMMU pt_base register */
kgsl_iommu_enable_clk(mmu, KGSL_IOMMU_CONTEXT_USER);
pt_base = readl_relaxed(iommu->iommu_units[0].reg_map.hostptr +