CIFS: Respect reconnect in MTU credits calculations

Every time after a session reconnect we don't need to account for
credits obtained in previous sessions. Introduce new struct cifs_credits
which contains both credits value and reconnect instance of the
time those credits were taken. Modify a routine that add credits
back to handle the reconnect instance by assuming zero credits
if the reconnect happened after the credits were obtained and
before we decided to add them back due to some errors during sending.

This patch fixes the MTU credits cases. The subsequent patch
will handle non-MTU ones.

Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

8 files changed, 118 insertions, 63 deletions

diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 0c796a27d1eb..4293b1f13f00 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -216,6 +216,7 @@ struct cifs_io_parms;
 struct cifs_search_info;
 struct cifsInodeInfo;
 struct cifs_open_parms;
+struct cifs_credits;
 
 struct smb_version_operations {
 	int (*send_cancel)(struct TCP_Server_Info *, struct smb_rqst *,
@@ -230,8 +231,9 @@ struct smb_version_operations {
 	/* check response: verify signature, map error */
 	int (*check_receive)(struct mid_q_entry *, struct TCP_Server_Info *,
 			     bool);
-	void (*add_credits)(struct TCP_Server_Info *, const unsigned int,
-			    const int);
+	void (*add_credits)(struct TCP_Server_Info *server,
+			    const struct cifs_credits *credits,
+			    const int optype);
 	void (*set_credits)(struct TCP_Server_Info *, const int);
 	int * (*get_credits_field)(struct TCP_Server_Info *, const int);
 	unsigned int (*get_credits)(struct mid_q_entry *);
@@ -454,7 +456,7 @@ struct smb_version_operations {
 	unsigned int (*wp_retry_size)(struct inode *);
 	/* get mtu credits */
 	int (*wait_mtu_credits)(struct TCP_Server_Info *, unsigned int,
-				unsigned int *, unsigned int *);
+				unsigned int *, struct cifs_credits *);
 	/* check if we need to issue closedir */
 	bool (*dir_needs_close)(struct cifsFileInfo *);
 	long (*fallocate)(struct file *, struct cifs_tcon *, int, loff_t,
@@ -713,6 +715,11 @@ struct TCP_Server_Info {
 	int nr_targets;
 };
 
+struct cifs_credits {
+	unsigned int value;
+	unsigned int instance;
+};
+
 static inline unsigned int
 in_flight(struct TCP_Server_Info *server)
 {
@@ -737,15 +744,17 @@ static inline void
 add_credits(struct TCP_Server_Info *server, const unsigned int add,
 	    const int optype)
 {
-	server->ops->add_credits(server, add, optype);
+	struct cifs_credits credits = { .value = add, .instance = 0 };
+
+	server->ops->add_credits(server, &credits, optype);
 }
 
 static inline void
-add_credits_and_wake_if(struct TCP_Server_Info *server, const unsigned int add,
-			const int optype)
+add_credits_and_wake_if(struct TCP_Server_Info *server,
+			const struct cifs_credits *credits, const int optype)
 {
-	if (add) {
-		server->ops->add_credits(server, add, optype);
+	if (credits->value) {
+		server->ops->add_credits(server, credits, optype);
 		wake_up(&server->request_q);
 	}
 }
@@ -1253,7 +1262,7 @@ struct cifs_readdata {
 	unsigned int			pagesz;
 	unsigned int			page_offset;
 	unsigned int			tailsz;
-	unsigned int			credits;
+	struct cifs_credits		credits;
 	unsigned int			nr_pages;
 	struct page			**pages;
 };
@@ -1279,7 +1288,7 @@ struct cifs_writedata {
 	unsigned int			pagesz;
 	unsigned int			page_offset;
 	unsigned int			tailsz;
-	unsigned int			credits;
+	struct cifs_credits		credits;
 	unsigned int			nr_pages;
 	struct page			**pages;
 };
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index 336c116995d7..7a9a9fd12ea9 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -115,7 +115,7 @@ extern int cifs_check_receive(struct mid_q_entry *mid,
 			struct TCP_Server_Info *server, bool log_error);
 extern int cifs_wait_mtu_credits(struct TCP_Server_Info *server,
 				 unsigned int size, unsigned int *num,
-				 unsigned int *credits);
+				 struct cifs_credits *credits);
 extern int SendReceive2(const unsigned int /* xid */ , struct cifs_ses *,
 			struct kvec *, int /* nvec to send */,
 			int * /* type of buf returned */, const int flags,
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 46bee3b4eeed..b95db2b593cb 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -593,6 +593,7 @@ cifs_reconnect(struct TCP_Server_Info *server)
 			msleep(3000);
 		} else {
 			atomic_inc(&tcpSesReconnectCount);
+			set_credits(server, 1);
 			spin_lock(&GlobalMid_Lock);
 			if (server->tcpStatus != CifsExiting)
 				server->tcpStatus = CifsNeedNegotiate;
@@ -4951,8 +4952,6 @@ cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses)
 	if (!server->ops->need_neg(server))
 		return 0;
 
-	set_credits(server, 1);
-
 	rc = server->ops->negotiate(xid, ses);
 	if (rc == 0) {
 		spin_lock(&GlobalMid_Lock);
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index da1f05f4ac0c..61b4dc7cfb91 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -2143,11 +2143,13 @@ static int cifs_writepages(struct address_space *mapping,
 	server = cifs_sb_master_tcon(cifs_sb)->ses->server;
 retry:
 	while (!done && index <= end) {
-		unsigned int i, nr_pages, found_pages, wsize, credits;
+		unsigned int i, nr_pages, found_pages, wsize;
 		pgoff_t next = 0, tofind, saved_index = index;
+		struct cifs_credits credits_on_stack;
+		struct cifs_credits *credits = &credits_on_stack;
 
 		rc = server->ops->wait_mtu_credits(server, cifs_sb->wsize,
-						   &wsize, &credits);
+						   &wsize, credits);
 		if (rc != 0) {
 			done = true;
 			break;
@@ -2180,13 +2182,13 @@ retry:
 			continue;
 		}
 
-		wdata->credits = credits;
+		wdata->credits = credits_on_stack;
 
 		rc = wdata_send_pages(wdata, nr_pages, mapping, wbc);
 
 		/* send failure -- clean up the mess */
 		if (rc != 0) {
-			add_credits_and_wake_if(server, wdata->credits, 0);
+			add_credits_and_wake_if(server, &wdata->credits, 0);
 			for (i = 0; i < nr_pages; ++i) {
 				if (is_retryable_error(rc))
 					redirty_page_for_writepage(wbc,
@@ -2567,7 +2569,8 @@ static int
 cifs_resend_wdata(struct cifs_writedata *wdata, struct list_head *wdata_list,
 	struct cifs_aio_ctx *ctx)
 {
-	unsigned int wsize, credits;
+	unsigned int wsize;
+	struct cifs_credits credits;
 	int rc;
 	struct TCP_Server_Info *server =
 		tlink_tcon(wdata->cfile->tlink)->ses->server;
@@ -2577,18 +2580,19 @@ cifs_resend_wdata(struct cifs_writedata *wdata, struct list_head *wdata_list,
 	 * Note: we are attempting to resend the whole wdata not in segments
 	 */
 	do {
-		rc = server->ops->wait_mtu_credits(
-			server, wdata->bytes, &wsize, &credits);
+		rc = server->ops->wait_mtu_credits(server, wdata->bytes, &wsize,
+						   &credits);
 
 		if (rc)
 			goto out;
 
 		if (wsize < wdata->bytes) {
-			add_credits_and_wake_if(server, credits, 0);
+			add_credits_and_wake_if(server, &credits, 0);
 			msleep(1000);
 		}
 	} while (wsize < wdata->bytes);
 
+	wdata->credits = credits;
 	rc = -EAGAIN;
 	while (rc == -EAGAIN) {
 		rc = 0;
@@ -2604,7 +2608,7 @@ cifs_resend_wdata(struct cifs_writedata *wdata, struct list_head *wdata_list,
 		return 0;
 	}
 
-	add_credits_and_wake_if(server, wdata->credits, 0);
+	add_credits_and_wake_if(server, &wdata->credits, 0);
 out:
 	kref_put(&wdata->refcount, cifs_uncached_writedata_release);
 
@@ -2627,6 +2631,7 @@ cifs_write_from_iter(loff_t offset, size_t len, struct iov_iter *from,
 	struct TCP_Server_Info *server;
 	struct page **pagevec;
 	size_t start;
+	unsigned int xid;
 
 	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
 		pid = open_file->pid;
@@ -2634,12 +2639,15 @@ cifs_write_from_iter(loff_t offset, size_t len, struct iov_iter *from,
 		pid = current->tgid;
 
 	server = tlink_tcon(open_file->tlink)->ses->server;
+	xid = get_xid();
 
 	do {
-		unsigned int wsize, credits;
+		unsigned int wsize;
+		struct cifs_credits credits_on_stack;
+		struct cifs_credits *credits = &credits_on_stack;
 
 		rc = server->ops->wait_mtu_credits(server, cifs_sb->wsize,
-						   &wsize, &credits);
+						   &wsize, credits);
 		if (rc)
 			break;
 
@@ -2731,7 +2739,7 @@ cifs_write_from_iter(loff_t offset, size_t len, struct iov_iter *from,
 		wdata->pid = pid;
 		wdata->bytes = cur_len;
 		wdata->pagesz = PAGE_SIZE;
-		wdata->credits = credits;
+		wdata->credits = credits_on_stack;
 		wdata->ctx = ctx;
 		kref_get(&ctx->refcount);
 
@@ -2740,7 +2748,7 @@ cifs_write_from_iter(loff_t offset, size_t len, struct iov_iter *from,
 			rc = server->ops->async_writev(wdata,
 					cifs_uncached_writedata_release);
 		if (rc) {
-			add_credits_and_wake_if(server, wdata->credits, 0);
+			add_credits_and_wake_if(server, &wdata->credits, 0);
 			kref_put(&wdata->refcount,
 				 cifs_uncached_writedata_release);
 			if (rc == -EAGAIN) {
@@ -2756,6 +2764,7 @@ cifs_write_from_iter(loff_t offset, size_t len, struct iov_iter *from,
 		len -= cur_len;
 	} while (len > 0);
 
+	free_xid(xid);
 	return rc;
 }
 
@@ -3260,7 +3269,8 @@ static int cifs_resend_rdata(struct cifs_readdata *rdata,
 			struct list_head *rdata_list,
 			struct cifs_aio_ctx *ctx)
 {
-	unsigned int rsize, credits;
+	unsigned int rsize;
+	struct cifs_credits credits;
 	int rc;
 	struct TCP_Server_Info *server =
 		tlink_tcon(rdata->cfile->tlink)->ses->server;
@@ -3277,11 +3287,12 @@ static int cifs_resend_rdata(struct cifs_readdata *rdata,
 			goto out;
 
 		if (rsize < rdata->bytes) {
-			add_credits_and_wake_if(server, credits, 0);
+			add_credits_and_wake_if(server, &credits, 0);
 			msleep(1000);
 		}
 	} while (rsize < rdata->bytes);
 
+	rdata->credits = credits;
 	rc = -EAGAIN;
 	while (rc == -EAGAIN) {
 		rc = 0;
@@ -3297,7 +3308,7 @@ static int cifs_resend_rdata(struct cifs_readdata *rdata,
 		return 0;
 	}
 
-	add_credits_and_wake_if(server, rdata->credits, 0);
+	add_credits_and_wake_if(server, &rdata->credits, 0);
 out:
 	kref_put(&rdata->refcount,
 		cifs_uncached_readdata_release);
@@ -3311,7 +3322,9 @@ cifs_send_async_read(loff_t offset, size_t len, struct cifsFileInfo *open_file,
 		     struct cifs_aio_ctx *ctx)
 {
 	struct cifs_readdata *rdata;
-	unsigned int npages, rsize, credits;
+	unsigned int npages, rsize;
+	struct cifs_credits credits_on_stack;
+	struct cifs_credits *credits = &credits_on_stack;
 	size_t cur_len;
 	int rc;
 	pid_t pid;
@@ -3332,7 +3345,7 @@ cifs_send_async_read(loff_t offset, size_t len, struct cifsFileInfo *open_file,
 
 	do {
 		rc = server->ops->wait_mtu_credits(server, cifs_sb->rsize,
-						   &rsize, &credits);
+						   &rsize, credits);
 		if (rc)
 			break;
 
@@ -3406,7 +3419,7 @@ cifs_send_async_read(loff_t offset, size_t len, struct cifsFileInfo *open_file,
 		rdata->pagesz = PAGE_SIZE;
 		rdata->read_into_pages = cifs_uncached_read_into_pages;
 		rdata->copy_into_pages = cifs_uncached_copy_into_pages;
-		rdata->credits = credits;
+		rdata->credits = credits_on_stack;
 		rdata->ctx = ctx;
 		kref_get(&ctx->refcount);
 
@@ -3414,7 +3427,7 @@ cifs_send_async_read(loff_t offset, size_t len, struct cifsFileInfo *open_file,
 		    !(rc = cifs_reopen_file(rdata->cfile, true)))
 			rc = server->ops->async_readv(rdata);
 		if (rc) {
-			add_credits_and_wake_if(server, rdata->credits, 0);
+			add_credits_and_wake_if(server, &rdata->credits, 0);
 			kref_put(&rdata->refcount,
 				cifs_uncached_readdata_release);
 			if (rc == -EAGAIN) {
@@ -4093,10 +4106,11 @@ static int cifs_readpages(struct file *file, struct address_space *mapping,
 		loff_t offset;
 		struct page *page, *tpage;
 		struct cifs_readdata *rdata;
-		unsigned credits;
+		struct cifs_credits credits_on_stack;
+		struct cifs_credits *credits = &credits_on_stack;
 
 		rc = server->ops->wait_mtu_credits(server, cifs_sb->rsize,
-						   &rsize, &credits);
+						   &rsize, credits);
 		if (rc)
 			break;
 
@@ -4142,7 +4156,7 @@ static int cifs_readpages(struct file *file, struct address_space *mapping,
 		rdata->tailsz = PAGE_SIZE;
 		rdata->read_into_pages = cifs_readpages_read_into_pages;
 		rdata->copy_into_pages = cifs_readpages_copy_into_pages;
-		rdata->credits = credits;
+		rdata->credits = credits_on_stack;
 
 		list_for_each_entry_safe(page, tpage, &tmplist, lru) {
 			list_del(&page->lru);
@@ -4153,7 +4167,7 @@ static int cifs_readpages(struct file *file, struct address_space *mapping,
 		    !(rc = cifs_reopen_file(rdata->cfile, true)))
 			rc = server->ops->async_readv(rdata);
 		if (rc) {
-			add_credits_and_wake_if(server, rdata->credits, 0);
+			add_credits_and_wake_if(server, &rdata->credits, 0);
 			for (i = 0; i < rdata->nr_pages; i++) {
 				page = rdata->pages[i];
 				lru_cache_add_file(page);
diff --git a/fs/cifs/smb1ops.c b/fs/cifs/smb1ops.c
index 32a6c020478f..6f92d649f6fb 100644
--- a/fs/cifs/smb1ops.c
+++ b/fs/cifs/smb1ops.c
@@ -117,11 +117,11 @@ cifs_find_mid(struct TCP_Server_Info *server, char *buffer)
 }
 
 static void
-cifs_add_credits(struct TCP_Server_Info *server, const unsigned int add,
-		 const int optype)
+cifs_add_credits(struct TCP_Server_Info *server,
+		 const struct cifs_credits *credits, const int optype)
 {
 	spin_lock(&server->req_lock);
-	server->credits += add;
+	server->credits += credits->value;
 	server->in_flight--;
 	spin_unlock(&server->req_lock);
 	wake_up(&server->request_q);
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index 7291d8289511..6f1a5f504c02 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -67,10 +67,13 @@ change_conf(struct TCP_Server_Info *server)
 }
 
 static void
-smb2_add_credits(struct TCP_Server_Info *server, const unsigned int add,
-		 const int optype)
+smb2_add_credits(struct TCP_Server_Info *server,
+		 const struct cifs_credits *credits, const int optype)
 {
 	int *val, rc = -1;
+	unsigned int add = credits->value;
+	unsigned int instance = credits->instance;
+	bool reconnect_detected = false;
 
 	spin_lock(&server->req_lock);
 	val = server->ops->get_credits_field(server, optype);
@@ -79,8 +82,11 @@ smb2_add_credits(struct TCP_Server_Info *server, const unsigned int add,
 	if (((optype & CIFS_OP_MASK) == CIFS_NEG_OP) && (*val != 0))
 		trace_smb3_reconnect_with_invalid_credits(server->CurrentMid,
 			server->hostname, *val);
+	if ((instance == 0) || (instance == server->reconnect_instance))
+		*val += add;
+	else
+		reconnect_detected = true;
 
-	*val += add;
 	if (*val > 65000) {
 		*val = 65000; /* Don't get near 64K credits, avoid srv bugs */
 		printk_once(KERN_WARNING "server overflowed SMB3 credits\n");
@@ -102,6 +108,10 @@ smb2_add_credits(struct TCP_Server_Info *server, const unsigned int add,
 	spin_unlock(&server->req_lock);
 	wake_up(&server->request_q);
 
+	if (reconnect_detected)
+		cifs_dbg(FYI, "trying to put %d credits from the old server instance %d\n",
+			 add, instance);
+
 	if (server->tcpStatus == CifsNeedReconnect
 	    || server->tcpStatus == CifsExiting)
 		return;
@@ -164,7 +174,7 @@ smb2_get_credits(struct mid_q_entry *mid)
 
 static int
 smb2_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size,
-		      unsigned int *num, unsigned int *credits)
+		      unsigned int *num, struct cifs_credits *credits)
 {
 	int rc = 0;
 	unsigned int scredits;
@@ -190,7 +200,8 @@ smb2_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size,
 			/* can deadlock with reopen */
 			if (scredits <= 8) {
 				*num = SMB2_MAX_BUFFER_SIZE;
-				*credits = 0;
+				credits->value = 0;
+				credits->instance = 0;
 				break;
 			}
 
@@ -199,8 +210,10 @@ smb2_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size,
 			*num = min_t(unsigned int, size,
 				     scredits * SMB2_MAX_BUFFER_SIZE);
 
-			*credits = DIV_ROUND_UP(*num, SMB2_MAX_BUFFER_SIZE);
-			server->credits -= *credits;
+			credits->value =
+				DIV_ROUND_UP(*num, SMB2_MAX_BUFFER_SIZE);
+			credits->instance = server->reconnect_instance;
+			server->credits -= credits->value;
 			server->in_flight++;
 			break;
 		}
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 77f2c723befa..04581f06f29f 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -3294,9 +3294,9 @@ smb2_async_readv(struct cifs_readdata *rdata)
 	rc = smb2_new_read_req(
 		(void **) &buf, &total_len, &io_parms, rdata, 0, 0);
 	if (rc) {
-		if (rc == -EAGAIN && rdata->credits) {
+		if (rc == -EAGAIN && rdata->credits.value) {
 			/* credits was reset by reconnect */
-			rdata->credits = 0;
+			rdata->credits.value = 0;
 			/* reduce in_flight value since we won't send the req */
 			spin_lock(&server->req_lock);
 			server->in_flight--;
@@ -3313,17 +3313,26 @@ smb2_async_readv(struct cifs_readdata *rdata)
 
 	shdr = (struct smb2_sync_hdr *)buf;
 
-	if (rdata->credits) {
+	if (rdata->credits.value > 0) {
 		shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
 						SMB2_MAX_BUFFER_SIZE));
 		shdr->CreditRequest =
 			cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 1);
 		spin_lock(&server->req_lock);
-		server->credits += rdata->credits -
+		if (server->reconnect_instance == rdata->credits.instance)
+			server->credits += rdata->credits.value -
 						le16_to_cpu(shdr->CreditCharge);
+		else {
+			spin_unlock(&server->req_lock);
+			cifs_dbg(VFS, "trying to return %u credits to old session\n",
+				 rdata->credits.value
+				 - le16_to_cpu(shdr->CreditCharge));
+			rc = -EAGAIN;
+			goto async_readv_out;
+		}
 		spin_unlock(&server->req_lock);
 		wake_up(&server->request_q);
-		rdata->credits = le16_to_cpu(shdr->CreditCharge);
+		rdata->credits.value = le16_to_cpu(shdr->CreditCharge);
 		flags |= CIFS_HAS_CREDITS;
 	}
 
@@ -3340,6 +3349,7 @@ smb2_async_readv(struct cifs_readdata *rdata)
 				    io_parms.offset, io_parms.length, rc);
 	}
 
+async_readv_out:
 	cifs_small_buf_release(buf);
 	return rc;
 }
@@ -3508,9 +3518,9 @@ smb2_async_writev(struct cifs_writedata *wdata,
 
 	rc = smb2_plain_req_init(SMB2_WRITE, tcon, (void **) &req, &total_len);
 	if (rc) {
-		if (rc == -EAGAIN && wdata->credits) {
+		if (rc == -EAGAIN && wdata->credits.value) {
 			/* credits was reset by reconnect */
-			wdata->credits = 0;
+			wdata->credits.value = 0;
 			/* reduce in_flight value since we won't send the req */
 			spin_lock(&server->req_lock);
 			server->in_flight--;
@@ -3603,17 +3613,26 @@ smb2_async_writev(struct cifs_writedata *wdata,
 	req->Length = cpu_to_le32(wdata->bytes);
 #endif
 
-	if (wdata->credits) {
+	if (wdata->credits.value > 0) {
 		shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
 						    SMB2_MAX_BUFFER_SIZE));
 		shdr->CreditRequest =
 			cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 1);
 		spin_lock(&server->req_lock);
-		server->credits += wdata->credits -
+		if (server->reconnect_instance == wdata->credits.instance)
+			server->credits += wdata->credits.value -
 						le16_to_cpu(shdr->CreditCharge);
+		else {
+			spin_unlock(&server->req_lock);
+			cifs_dbg(VFS, "trying to return %d credits to old session\n",
+				 wdata->credits.value
+				 - le16_to_cpu(shdr->CreditCharge));
+			rc = -EAGAIN;
+			goto async_writev_out;
+		}
 		spin_unlock(&server->req_lock);
 		wake_up(&server->request_q);
-		wdata->credits = le16_to_cpu(shdr->CreditCharge);
+		wdata->credits.value = le16_to_cpu(shdr->CreditCharge);
 		flags |= CIFS_HAS_CREDITS;
 	}
 
diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c
index 9544eb99b5a2..099a1c914720 100644
--- a/fs/cifs/transport.c
+++ b/fs/cifs/transport.c
@@ -512,10 +512,11 @@ wait_for_free_request(struct TCP_Server_Info *server, const int timeout,
 
 int
 cifs_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size,
-		      unsigned int *num, unsigned int *credits)
+		      unsigned int *num, struct cifs_credits *credits)
 {
 	*num = size;
-	*credits = 0;
+	credits->value = 0;
+	credits->instance = server->reconnect_instance;
 	return 0;
 }
 
@@ -606,7 +607,7 @@ cifs_call_async(struct TCP_Server_Info *server, struct smb_rqst *rqst,
 {
 	int rc, timeout, optype;
 	struct mid_q_entry *mid;
-	unsigned int credits = 0;
+	struct cifs_credits credits = { .value = 0, .instance = 0 };
 
 	timeout = flags & CIFS_TIMEOUT_MASK;
 	optype = flags & CIFS_OP_MASK;
@@ -615,14 +616,14 @@ cifs_call_async(struct TCP_Server_Info *server, struct smb_rqst *rqst,
 		rc = wait_for_free_request(server, timeout, optype);
 		if (rc)
 			return rc;
-		credits = 1;
+		credits.value = 1;
 	}
 
 	mutex_lock(&server->srv_mutex);
 	mid = server->ops->setup_async_request(server, rqst);
 	if (IS_ERR(mid)) {
 		mutex_unlock(&server->srv_mutex);
-		add_credits_and_wake_if(server, credits, optype);
+		add_credits_and_wake_if(server, &credits, optype);
 		return PTR_ERR(mid);
 	}
 
@@ -657,7 +658,7 @@ cifs_call_async(struct TCP_Server_Info *server, struct smb_rqst *rqst,
 	if (rc == 0)
 		return 0;
 
-	add_credits_and_wake_if(server, credits, optype);
+	add_credits_and_wake_if(server, &credits, optype);
 	return rc;
 }