RDMA/cxgb4: release hw resources on device removal
The c4iw_rdev_close() logic was not releasing all the hw
resources (PBL and RQT memory) during the device removal
event (driver unload / system reboot). This can cause panic
in gen_pool_destroy().
The module remove function will wait for all the hw
resources to be released during the device removal event.
Fixes c12a67fe(iw_cxgb4: free EQ queue memory on last deref)
Signed-off-by: Raju Rangoju <rajur@chelsio.com>
Reviewed-by: Steve Wise <swise@opengridcomputing.com>
Cc: stable@vger.kernel.org
Signed-off-by: Doug Ledford <dledford@redhat.com>
diff --git a/drivers/infiniband/hw/cxgb4/resource.c b/drivers/infiniband/hw/cxgb4/resource.c
index 3cf2599..0ef25ae 100644
--- a/drivers/infiniband/hw/cxgb4/resource.c
+++ b/drivers/infiniband/hw/cxgb4/resource.c
@@ -260,12 +260,22 @@ u32 c4iw_pblpool_alloc(struct c4iw_rdev *rdev, int size)
rdev->stats.pbl.cur += roundup(size, 1 << MIN_PBL_SHIFT);
if (rdev->stats.pbl.cur > rdev->stats.pbl.max)
rdev->stats.pbl.max = rdev->stats.pbl.cur;
+ kref_get(&rdev->pbl_kref);
} else
rdev->stats.pbl.fail++;
mutex_unlock(&rdev->stats.lock);
return (u32)addr;
}
+static void destroy_pblpool(struct kref *kref)
+{
+ struct c4iw_rdev *rdev;
+
+ rdev = container_of(kref, struct c4iw_rdev, pbl_kref);
+ gen_pool_destroy(rdev->pbl_pool);
+ complete(&rdev->pbl_compl);
+}
+
void c4iw_pblpool_free(struct c4iw_rdev *rdev, u32 addr, int size)
{
pr_debug("addr 0x%x size %d\n", addr, size);
@@ -273,6 +283,7 @@ void c4iw_pblpool_free(struct c4iw_rdev *rdev, u32 addr, int size)
rdev->stats.pbl.cur -= roundup(size, 1 << MIN_PBL_SHIFT);
mutex_unlock(&rdev->stats.lock);
gen_pool_free(rdev->pbl_pool, (unsigned long)addr, size);
+ kref_put(&rdev->pbl_kref, destroy_pblpool);
}
int c4iw_pblpool_create(struct c4iw_rdev *rdev)
@@ -310,7 +321,7 @@ int c4iw_pblpool_create(struct c4iw_rdev *rdev)
void c4iw_pblpool_destroy(struct c4iw_rdev *rdev)
{
- gen_pool_destroy(rdev->pbl_pool);
+ kref_put(&rdev->pbl_kref, destroy_pblpool);
}
/*
@@ -331,12 +342,22 @@ u32 c4iw_rqtpool_alloc(struct c4iw_rdev *rdev, int size)
rdev->stats.rqt.cur += roundup(size << 6, 1 << MIN_RQT_SHIFT);
if (rdev->stats.rqt.cur > rdev->stats.rqt.max)
rdev->stats.rqt.max = rdev->stats.rqt.cur;
+ kref_get(&rdev->rqt_kref);
} else
rdev->stats.rqt.fail++;
mutex_unlock(&rdev->stats.lock);
return (u32)addr;
}
+static void destroy_rqtpool(struct kref *kref)
+{
+ struct c4iw_rdev *rdev;
+
+ rdev = container_of(kref, struct c4iw_rdev, rqt_kref);
+ gen_pool_destroy(rdev->rqt_pool);
+ complete(&rdev->rqt_compl);
+}
+
void c4iw_rqtpool_free(struct c4iw_rdev *rdev, u32 addr, int size)
{
pr_debug("addr 0x%x size %d\n", addr, size << 6);
@@ -344,6 +365,7 @@ void c4iw_rqtpool_free(struct c4iw_rdev *rdev, u32 addr, int size)
rdev->stats.rqt.cur -= roundup(size << 6, 1 << MIN_RQT_SHIFT);
mutex_unlock(&rdev->stats.lock);
gen_pool_free(rdev->rqt_pool, (unsigned long)addr, size << 6);
+ kref_put(&rdev->rqt_kref, destroy_rqtpool);
}
int c4iw_rqtpool_create(struct c4iw_rdev *rdev)
@@ -380,7 +402,7 @@ int c4iw_rqtpool_create(struct c4iw_rdev *rdev)
void c4iw_rqtpool_destroy(struct c4iw_rdev *rdev)
{
- gen_pool_destroy(rdev->rqt_pool);
+ kref_put(&rdev->rqt_kref, destroy_rqtpool);
}
/*