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Commit c4e16abf authored by Deepak Kumar's avatar Deepak Kumar Committed by Gerrit - the friendly Code Review server
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msm: kgsl: Prevent race condition when freeing memory 



Add a check to set the pending_free flag if it is not already
set before freeing sparse memory entry. This is required to
prevent multiple ioctl threads from freeing the same sparse
memory entry.

Change-Id: I4e2bbe6fcd98c58d36340c4f87cdff27fc1de22e
Signed-off-by: default avatarDeepak Kumar <dkumar@codeaurora.org>
parent 3f33435e

drivers/gpu/msm/kgsl.c

+12 −0
Original line number Diff line number Diff line
@@ -3356,7 +3356,13 @@ long kgsl_ioctl_sparse_phys_free(struct kgsl_device_private *dev_priv, 
	if (entry == NULL)

		return -EINVAL;



	if (!kgsl_mem_entry_set_pend(entry)) {

		kgsl_mem_entry_put(entry);

		return -EBUSY;

	}



	if (entry->memdesc.cur_bindings != 0) {

		kgsl_mem_entry_unset_pend(entry);

		kgsl_mem_entry_put(entry);

		return -EINVAL;

	}
@@ -3425,7 +3431,13 @@ long kgsl_ioctl_sparse_virt_free(struct kgsl_device_private *dev_priv, 
	if (entry == NULL)

		return -EINVAL;



	if (!kgsl_mem_entry_set_pend(entry)) {

		kgsl_mem_entry_put(entry);

		return -EBUSY;

	}



	if (entry->bind_tree.rb_node != NULL) {

		kgsl_mem_entry_unset_pend(entry);

		kgsl_mem_entry_put(entry);

		return -EINVAL;

	}