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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-03-25 03:53:42 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-03-25 03:53:42 -0300
commit03dd4cb26d967f9588437b0fc9cc0e8353322bb7 (patch)
treefa581f6dc1c0596391690d1f67eceef3af8246dc /drivers/misc/cxl/context.c
parentd4e493caf788ef44982e131ff9c786546904d934 (diff)
Linux-libre 4.5-gnu
Diffstat (limited to 'drivers/misc/cxl/context.c')
-rw-r--r--drivers/misc/cxl/context.c15
1 files changed, 14 insertions, 1 deletions
diff --git a/drivers/misc/cxl/context.c b/drivers/misc/cxl/context.c
index 2faa1270d..262b88eac 100644
--- a/drivers/misc/cxl/context.c
+++ b/drivers/misc/cxl/context.c
@@ -42,7 +42,7 @@ int cxl_context_init(struct cxl_context *ctx, struct cxl_afu *afu, bool master,
spin_lock_init(&ctx->sste_lock);
ctx->afu = afu;
ctx->master = master;
- ctx->pid = NULL; /* Set in start work ioctl */
+ ctx->pid = ctx->glpid = NULL; /* Set in start work ioctl */
mutex_init(&ctx->mapping_lock);
ctx->mapping = mapping;
@@ -97,6 +97,12 @@ int cxl_context_init(struct cxl_context *ctx, struct cxl_afu *afu, bool master,
ctx->pe = i;
ctx->elem = &ctx->afu->spa[i];
ctx->pe_inserted = false;
+
+ /*
+ * take a ref on the afu so that it stays alive at-least till
+ * this context is reclaimed inside reclaim_ctx.
+ */
+ cxl_afu_get(afu);
return 0;
}
@@ -211,7 +217,11 @@ int __detach_context(struct cxl_context *ctx)
WARN_ON(cxl_detach_process(ctx) &&
cxl_adapter_link_ok(ctx->afu->adapter));
flush_work(&ctx->fault_work); /* Only needed for dedicated process */
+
+ /* release the reference to the group leader and mm handling pid */
put_pid(ctx->pid);
+ put_pid(ctx->glpid);
+
cxl_ctx_put();
return 0;
}
@@ -278,6 +288,9 @@ static void reclaim_ctx(struct rcu_head *rcu)
if (ctx->irq_bitmap)
kfree(ctx->irq_bitmap);
+ /* Drop ref to the afu device taken during cxl_context_init */
+ cxl_afu_put(ctx->afu);
+
kfree(ctx);
}