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IB/hfi1: Fix memory leak during unexpected shutdown 

During an unexpected shutdown, references to tid_rb_node were NULL'ed out
without properly being released.

Fix this by calling clear_tid_node in the mmu notifier remove callback
rather than after these callbacks are called.

Reviewed-by: Dean Luick <dean.luick@intel.com>
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Ira Weiny 2016-07-28 15:21:26 -04:00 committed by Doug Ledford
parent 082b353291
commit 2677a7680e
1 changed files with 32 additions and 14 deletions
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46
drivers/infiniband/hw/hfi1/user_exp_rcv.c
View File

@ -87,13 +87,15 @@ static u32 find_phys_blocks(struct page **, unsigned, struct tid_pageset *);
static int set_rcvarray_entry(struct file *, unsigned long, u32,
struct tid_group *, struct page **, unsigned);
static int tid_rb_insert(void *, struct mmu_rb_node *);
static void cacheless_tid_rb_remove(struct hfi1_filedata *fdata,
struct tid_rb_node *tnode);
static void tid_rb_remove(void *, struct mmu_rb_node *);
static int tid_rb_invalidate(void *, struct mmu_rb_node *);
static int program_rcvarray(struct file *, unsigned long, struct tid_group *,
struct tid_pageset *, unsigned, u16, struct page **,
u32 *, unsigned *, unsigned *);
static int unprogram_rcvarray(struct file *, u32, struct tid_group **);
static void clear_tid_node(struct hfi1_filedata *, struct tid_rb_node *);
static void clear_tid_node(struct hfi1_filedata *fd, struct tid_rb_node *node);
static struct mmu_rb_ops tid_rb_ops = {
.insert = tid_rb_insert,
@ -899,14 +901,15 @@ static int unprogram_rcvarray(struct file *fp, u32 tidinfo,
node = fd->entry_to_rb[rcventry];
if (!node || node->rcventry != (uctxt->expected_base + rcventry))
return -EBADF;
if (!fd->handler)
tid_rb_remove(fd, &node->mmu);
else
hfi1_mmu_rb_remove(fd->handler, &node->mmu);
if (grp)
*grp = node->grp;
clear_tid_node(fd, node);
if (!fd->handler)
cacheless_tid_rb_remove(fd, node);
else
hfi1_mmu_rb_remove(fd->handler, &node->mmu);
return 0;
}
@ -943,6 +946,10 @@ static void clear_tid_node(struct hfi1_filedata *fd, struct tid_rb_node *node)
kfree(node);
}
/*
* As a simple helper for hfi1_user_exp_rcv_free, this function deals with
* clearing nodes in the non-cached case.
*/
static void unlock_exp_tids(struct hfi1_ctxtdata *uctxt,
struct exp_tid_set *set,
struct hfi1_filedata *fd)
@ -962,17 +969,20 @@ static void unlock_exp_tids(struct hfi1_ctxtdata *uctxt,
uctxt->expected_base];
if (!node || node->rcventry != rcventry)
continue;
if (!fd->handler)
tid_rb_remove(fd, &node->mmu);
else
hfi1_mmu_rb_remove(fd->handler,
&node->mmu);
clear_tid_node(fd, node);
cacheless_tid_rb_remove(fd, node);
}
}
}
}
/*
* Always return 0 from this function. A non-zero return indicates that the
* remove operation will be called and that memory should be unpinned.
* However, the driver cannot unpin out from under PSM. Instead, retain the
* memory (by returning 0) and inform PSM that the memory is going away. PSM
* will call back later when it has removed the memory from its list.
*/
static int tid_rb_invalidate(void *arg, struct mmu_rb_node *mnode)
{
struct hfi1_filedata *fdata = arg;
@ -1027,12 +1037,20 @@ static int tid_rb_insert(void *arg, struct mmu_rb_node *node)
return 0;
}
static void cacheless_tid_rb_remove(struct hfi1_filedata *fdata,
struct tid_rb_node *tnode)
{
u32 base = fdata->uctxt->expected_base;
fdata->entry_to_rb[tnode->rcventry - base] = NULL;
clear_tid_node(fdata, tnode);
}
static void tid_rb_remove(void *arg, struct mmu_rb_node *node)
{
struct hfi1_filedata *fdata = arg;
struct tid_rb_node *tnode =
container_of(node, struct tid_rb_node, mmu);
u32 base = fdata->uctxt->expected_base;
fdata->entry_to_rb[tnode->rcventry - base] = NULL;
cacheless_tid_rb_remove(fdata, tnode);
}