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RDMA/nes: Correct handling of PBL resources

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* Roll back allocated structures on failures.
    * Use GFP_ATOMIC instead of GFP_KERNEL since we are holding a lock.
    * Acquire nesadapter->pbl_lock when modifying PBL counters.
    * Decrement PBL counters on deallocation.

Signed-off-by: Chien Tung <chien.tin.tung@intel.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Chien Tung 2008-11-02 21:37:35 -08:00 committed by Roland Dreier
parent 5880ff19fa
commit 35c6d6942c
1 changed files with 33 additions and 11 deletions
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44
drivers/infiniband/hw/nes/nes_verbs.c
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@ -349,7 +349,7 @@ static struct ib_fmr *nes_alloc_fmr(struct ib_pd *ibpd,
if (nesfmr->nesmr.pbls_used > nesadapter->free_4kpbl) {
spin_unlock_irqrestore(&nesadapter->pbl_lock, flags);
ret = -ENOMEM;
goto failed_vpbl_alloc;
goto failed_vpbl_avail;
} else {
nesadapter->free_4kpbl -= nesfmr->nesmr.pbls_used;
}
@ -357,7 +357,7 @@ static struct ib_fmr *nes_alloc_fmr(struct ib_pd *ibpd,
if (nesfmr->nesmr.pbls_used > nesadapter->free_256pbl) {
spin_unlock_irqrestore(&nesadapter->pbl_lock, flags);
ret = -ENOMEM;
goto failed_vpbl_alloc;
goto failed_vpbl_avail;
} else {
nesadapter->free_256pbl -= nesfmr->nesmr.pbls_used;
}
@ -391,14 +391,14 @@ static struct ib_fmr *nes_alloc_fmr(struct ib_pd *ibpd,
goto failed_vpbl_alloc;
}
nesfmr->root_vpbl.leaf_vpbl = kzalloc(sizeof(*nesfmr->root_vpbl.leaf_vpbl)*1024, GFP_KERNEL);
nesfmr->leaf_pbl_cnt = nesfmr->nesmr.pbls_used-1;
nesfmr->root_vpbl.leaf_vpbl = kzalloc(sizeof(*nesfmr->root_vpbl.leaf_vpbl)*1024, GFP_ATOMIC);
if (!nesfmr->root_vpbl.leaf_vpbl) {
spin_unlock_irqrestore(&nesadapter->pbl_lock, flags);
ret = -ENOMEM;
goto failed_leaf_vpbl_alloc;
}
nesfmr->leaf_pbl_cnt = nesfmr->nesmr.pbls_used-1;
nes_debug(NES_DBG_MR, "two level pbl, root_vpbl.pbl_vbase=%p"
" leaf_pbl_cnt=%d root_vpbl.leaf_vpbl=%p\n",
nesfmr->root_vpbl.pbl_vbase, nesfmr->leaf_pbl_cnt, nesfmr->root_vpbl.leaf_vpbl);
@ -519,6 +519,16 @@ static struct ib_fmr *nes_alloc_fmr(struct ib_pd *ibpd,
nesfmr->root_vpbl.pbl_pbase);
failed_vpbl_alloc:
if (nesfmr->nesmr.pbls_used != 0) {
spin_lock_irqsave(&nesadapter->pbl_lock, flags);
if (nesfmr->nesmr.pbl_4k)
nesadapter->free_4kpbl += nesfmr->nesmr.pbls_used;
else
nesadapter->free_256pbl += nesfmr->nesmr.pbls_used;
spin_unlock_irqrestore(&nesadapter->pbl_lock, flags);
}
failed_vpbl_avail:
kfree(nesfmr);
failed_fmr_alloc:
@ -534,18 +544,14 @@ static struct ib_fmr *nes_alloc_fmr(struct ib_pd *ibpd,
*/
static int nes_dealloc_fmr(struct ib_fmr *ibfmr)
{
unsigned long flags;
struct nes_mr *nesmr = to_nesmr_from_ibfmr(ibfmr);
struct nes_fmr *nesfmr = to_nesfmr(nesmr);
struct nes_vnic *nesvnic = to_nesvnic(ibfmr->device);
struct nes_device *nesdev = nesvnic->nesdev;
struct nes_mr temp_nesmr = *nesmr;
struct nes_adapter *nesadapter = nesdev->nesadapter;
int i = 0;
temp_nesmr.ibmw.device = ibfmr->device;
temp_nesmr.ibmw.pd = ibfmr->pd;
temp_nesmr.ibmw.rkey = ibfmr->rkey;
temp_nesmr.ibmw.uobject = NULL;
/* free the resources */
if (nesfmr->leaf_pbl_cnt == 0) {
/* single PBL case */
@ -561,8 +567,24 @@ static int nes_dealloc_fmr(struct ib_fmr *ibfmr)
pci_free_consistent(nesdev->pcidev, 8192, nesfmr->root_vpbl.pbl_vbase,
nesfmr->root_vpbl.pbl_pbase);
}
nesmr->ibmw.device = ibfmr->device;
nesmr->ibmw.pd = ibfmr->pd;
nesmr->ibmw.rkey = ibfmr->rkey;
nesmr->ibmw.uobject = NULL;
return nes_dealloc_mw(&temp_nesmr.ibmw);
if (nesfmr->nesmr.pbls_used != 0) {
spin_lock_irqsave(&nesadapter->pbl_lock, flags);
if (nesfmr->nesmr.pbl_4k) {
nesadapter->free_4kpbl += nesfmr->nesmr.pbls_used;
WARN_ON(nesadapter->free_4kpbl > nesadapter->max_4kpbl);
} else {
nesadapter->free_256pbl += nesfmr->nesmr.pbls_used;
WARN_ON(nesadapter->free_256pbl > nesadapter->max_256pbl);
}
spin_unlock_irqrestore(&nesadapter->pbl_lock, flags);
}
return nes_dealloc_mw(&nesmr->ibmw);
}