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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>
This commit is contained in:
Long Li 2020-04-02 13:42:06 -07:00 committed by Steve French
parent 3ffbe78aff
commit d4e5160d1a
1 changed files with 18 additions and 7 deletions
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25
fs/cifs/smbdirect.c
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@ -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;
}