4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Raju Rangoju <rajur@xxxxxxxxxxx>
commit 26bff1bd74a4f7417509a83295614e9dab995b2a upstream.
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@xxxxxxxxxxx>
Reviewed-by: Steve Wise <swise@xxxxxxxxxxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Doug Ledford <dledford@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/infiniband/hw/cxgb4/device.c | 9 ++++++++-
drivers/infiniband/hw/cxgb4/iw_cxgb4.h | 4 ++++
drivers/infiniband/hw/cxgb4/resource.c | 26 ++++++++++++++++++++++++--
3 files changed, 36 insertions(+), 3 deletions(-)
--- a/drivers/infiniband/hw/cxgb4/device.c
+++ b/drivers/infiniband/hw/cxgb4/device.c
@@ -856,6 +856,11 @@ static int c4iw_rdev_open(struct c4iw_rd
rdev->status_page->db_off = 0;
+ init_completion(&rdev->rqt_compl);
+ init_completion(&rdev->pbl_compl);
+ kref_init(&rdev->rqt_kref);
+ kref_init(&rdev->pbl_kref);
+
return 0;
err_free_status_page:
free_page((unsigned long)rdev->status_page);
@@ -872,12 +877,14 @@ destroy_resource:
static void c4iw_rdev_close(struct c4iw_rdev *rdev)
{
- destroy_workqueue(rdev->free_workq);
kfree(rdev->wr_log);
free_page((unsigned long)rdev->status_page);
c4iw_pblpool_destroy(rdev);
c4iw_rqtpool_destroy(rdev);
+ wait_for_completion(&rdev->pbl_compl);
+ wait_for_completion(&rdev->rqt_compl);
c4iw_destroy_resource(&rdev->resource);
+ destroy_workqueue(rdev->free_workq);
}
static void c4iw_dealloc(struct uld_ctx *ctx)
--- a/drivers/infiniband/hw/cxgb4/iw_cxgb4.h
+++ b/drivers/infiniband/hw/cxgb4/iw_cxgb4.h
@@ -186,6 +186,10 @@ struct c4iw_rdev {
struct wr_log_entry *wr_log;
int wr_log_size;
struct workqueue_struct *free_workq;
+ struct completion rqt_compl;
+ struct completion pbl_compl;
+ struct kref rqt_kref;
+ struct kref pbl_kref;
};
static inline int c4iw_fatal_error(struct c4iw_rdev *rdev)
--- 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->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)
{
PDBG("%s addr 0x%x size %d\n", __func__, addr, size);
@@ -273,6 +283,7 @@ void c4iw_pblpool_free(struct c4iw_rdev
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)
@@ -312,7 +323,7 @@ int c4iw_pblpool_create(struct c4iw_rdev
void c4iw_pblpool_destroy(struct c4iw_rdev *rdev)
{
- gen_pool_destroy(rdev->pbl_pool);
+ kref_put(&rdev->pbl_kref, destroy_pblpool);
}
/*
@@ -333,12 +344,22 @@ u32 c4iw_rqtpool_alloc(struct c4iw_rdev
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)
{
PDBG("%s addr 0x%x size %d\n", __func__, addr, size << 6);
@@ -346,6 +367,7 @@ void c4iw_rqtpool_free(struct c4iw_rdev
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)
@@ -383,7 +405,7 @@ int c4iw_rqtpool_create(struct c4iw_rdev
void c4iw_rqtpool_destroy(struct c4iw_rdev *rdev)
{
- gen_pool_destroy(rdev->rqt_pool);
+ kref_put(&rdev->rqt_kref, destroy_rqtpool);
}
/*
