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IB/hfi1: Fix an Oops on pci device force remove

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This patch fixes an Oops on device unbind, when the device is used
by a PSM user process. PSM processes access device resources which
are freed on device removal. Similar protection exists in uverbs
in ib_core for Verbs clients, but PSM doesn't use ib_uverbs hence
a separate protection is required for PSM clients.

Cc: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Dean Luick <dean.luick@intel.com>
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Tadeusz Struk <tadeusz.struk@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Tadeusz Struk
2016-10-25 08:57:55 -07:00
committed by Doug Ledford
parent d9ac4555fb
commit acd7c8fe14
4 changed files with 44 additions and 5 deletions
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4
drivers/infiniband/hw/hfi1/hfi.h
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@@ -1174,6 +1174,10 @@ struct hfi1_devdata {
spinlock_t aspm_lock;
/* Number of verbs contexts which have disabled ASPM */
atomic_t aspm_disabled_cnt;
/* Keeps track of user space clients */
atomic_t user_refcount;
/* Used to wait for outstanding user space clients before dev removal */
struct completion user_comp;
struct hfi1_affinity *affinity;
struct rhashtable sdma_rht;