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Commit d828a036 authored by Harshdeep Dhatt's avatar Harshdeep Dhatt
Browse files

msm: kgsl: Fix NULL pointer dereference 



Before dereferencing the register base, check
if it has been initialized or not. This saves us
a device crash during gmu snapshot that occurs
before the register base is initialized.

Change-Id: I5402a82b0549b219f75f9268724f7a114aaeddf0
Signed-off-by: default avatarHarshdeep Dhatt <hdhatt@codeaurora.org>
parent 81ecb311

drivers/gpu/msm/kgsl_iommu.c

+6 −2
Original line number Diff line number Diff line
@@ -2090,6 +2090,8 @@ kgsl_iommu_get_current_ttbr0(struct kgsl_mmu *mmu) 
{

	u64 val;

	struct kgsl_iommu *iommu = _IOMMU_PRIV(mmu);

	struct kgsl_iommu_context *ctx = &iommu->ctx[KGSL_IOMMU_CONTEXT_USER];



	/*

	 * We cannot enable or disable the clocks in interrupt context, this

	 * function is called from interrupt context if there is an axi error
@@ -2097,9 +2099,11 @@ kgsl_iommu_get_current_ttbr0(struct kgsl_mmu *mmu) 
	if (in_interrupt())

		return 0;



	if (ctx->regbase == NULL)

		return 0;



	kgsl_iommu_enable_clk(mmu);

	val = KGSL_IOMMU_GET_CTX_REG_Q(&iommu->ctx[KGSL_IOMMU_CONTEXT_USER],

					TTBR0);

	val = KGSL_IOMMU_GET_CTX_REG_Q(ctx, TTBR0);

	kgsl_iommu_disable_clk(mmu);

	return val;

}