diff options
| author | Long Li <longli@microsoft.com> | 2020-04-02 23:42:06 +0300 |
|---|---|---|
| committer | Steve French <stfrench@microsoft.com> | 2020-04-07 20:41:16 +0300 |
| commit | d4e5160d1a0bf089af41c21f273a507e6ace45cd (patch) | |
| tree | 27691d264d448e7b08419eff205e4a27eb737111 /fs/cifs/smbdirect.c | |
| parent | 3ffbe78aff93586d3e09e8af4501c563ab367c75 (diff) | |
| download | linux-d4e5160d1a0bf089af41c21f273a507e6ace45cd.tar.xz | |
cifs: smbd: Update receive credits before sending and deal with credits roll back on failure before sending
Recevie credits should be updated before sending the packet, not
before a work is scheduled. Also, the value needs roll back if
something fails and cannot send.
Signed-off-by: Long Li <longli@microsoft.com>
Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Diffstat (limited to 'fs/cifs/smbdirect.c')
| -rw-r--r-- | fs/cifs/smbdirect.c | 25 |
1 files changed, 18 insertions, 7 deletions
diff --git a/fs/cifs/smbdirect.c b/fs/cifs/smbdirect.c index c7ef2d7ce0ef..fa52bf3e0236 100644 --- a/fs/cifs/smbdirect.c +++ b/fs/cifs/smbdirect.c @@ -450,8 +450,6 @@ static void smbd_post_send_credits(struct work_struct *work) info->new_credits_offered += ret; spin_unlock(&info->lock_new_credits_offered); - atomic_add(ret, &info->receive_credits); - /* Check if we can post new receive and grant credits to peer */ check_and_send_immediate(info); } @@ -822,6 +820,7 @@ static int smbd_create_header(struct smbd_connection *info, struct smbd_request *request; struct smbd_data_transfer *packet; int header_length; + int new_credits; int rc; /* Wait for send credits. A SMBD packet needs one credit */ @@ -840,7 +839,7 @@ static int smbd_create_header(struct smbd_connection *info, request = mempool_alloc(info->request_mempool, GFP_KERNEL); if (!request) { rc = -ENOMEM; - goto err; + goto err_alloc; } request->info = info; @@ -848,8 +847,11 @@ static int smbd_create_header(struct smbd_connection *info, /* Fill in the packet header */ packet = smbd_request_payload(request); packet->credits_requested = cpu_to_le16(info->send_credit_target); - packet->credits_granted = - cpu_to_le16(manage_credits_prior_sending(info)); + + new_credits = manage_credits_prior_sending(info); + atomic_add(new_credits, &info->receive_credits); + packet->credits_granted = cpu_to_le16(new_credits); + info->send_immediate = false; packet->flags = 0; @@ -887,7 +889,7 @@ static int smbd_create_header(struct smbd_connection *info, if (ib_dma_mapping_error(info->id->device, request->sge[0].addr)) { mempool_free(request, info->request_mempool); rc = -EIO; - goto err; + goto err_dma; } request->sge[0].length = header_length; @@ -896,8 +898,17 @@ static int smbd_create_header(struct smbd_connection *info, *request_out = request; return 0; -err: +err_dma: + /* roll back receive credits */ + spin_lock(&info->lock_new_credits_offered); + info->new_credits_offered += new_credits; + spin_unlock(&info->lock_new_credits_offered); + atomic_sub(new_credits, &info->receive_credits); + +err_alloc: + /* roll back send credits */ atomic_inc(&info->send_credits); + return rc; } |