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Commit a6b07d82 authored by Michael Neuling's avatar Michael Neuling Committed by Michael Ellerman
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cxl: Only check pid for userspace contexts 



We only need to check the pid attached to this context for userspace contexts.
Kernel contexts can skip this check.

Signed-off-by: default avatarMichael Neuling <mikey@neuling.org>
Acked-by: default avatarIan Munsie <imunsie@au1.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 1a1a94b8

drivers/misc/cxl/fault.c

+19 −15
Original line number Diff line number Diff line
@@ -172,8 +172,8 @@ void cxl_handle_fault(struct work_struct *fault_work) 
		container_of(fault_work, struct cxl_context, fault_work);

	u64 dsisr = ctx->dsisr;

	u64 dar = ctx->dar;

	struct task_struct *task;

	struct mm_struct *mm;

	struct task_struct *task = NULL;

	struct mm_struct *mm = NULL;



	if (cxl_p2n_read(ctx->afu, CXL_PSL_DSISR_An) != dsisr ||

	    cxl_p2n_read(ctx->afu, CXL_PSL_DAR_An) != dar ||
@@ -194,6 +194,7 @@ void cxl_handle_fault(struct work_struct *fault_work) 
	pr_devel("CXL BOTTOM HALF handling fault for afu pe: %i. "

		"DSISR: %#llx DAR: %#llx\n", ctx->pe, dsisr, dar);



	if (!ctx->kernel) {

		if (!(task = get_pid_task(ctx->pid, PIDTYPE_PID))) {

			pr_devel("cxl_handle_fault unable to get task %i\n",

				 pid_nr(ctx->pid));
@@ -206,6 +207,7 @@ void cxl_handle_fault(struct work_struct *fault_work) 
			cxl_ack_ae(ctx);

			goto out;

		}

	}



	if (dsisr & CXL_PSL_DSISR_An_DS)

		cxl_handle_segment_miss(ctx, mm, dar);
@@ -214,8 +216,10 @@ void cxl_handle_fault(struct work_struct *fault_work) 
	else

		WARN(1, "cxl_handle_fault has nothing to handle\n");



	if (mm)

		mmput(mm);

out:

	if (task)

		put_task_struct(task);

}