diff --git a/drivers/gpio/gpiolib-cdev.c b/drivers/gpio/gpiolib-cdev.c
index 40d0196d8bdcc02ad3c34efdb6a23f639bd21415..b273cb988aec2bce2a7b9d90f3cefc55084bdb05 100644
--- a/drivers/gpio/gpiolib-cdev.c
+++ b/drivers/gpio/gpiolib-cdev.c
@@ -2345,9 +2345,9 @@ static int gpio_chrdev_release(struct inode *inode, struct file *file)
 	struct gpio_chardev_data *cdev = file->private_data;
 	struct gpio_device *gdev = cdev->gdev;
 
-	bitmap_free(cdev->watched_lines);
 	blocking_notifier_chain_unregister(&gdev->notifier,
 					   &cdev->lineinfo_changed_nb);
+	bitmap_free(cdev->watched_lines);
 	put_device(&gdev->dev);
 	kfree(cdev);
 
diff --git a/drivers/media/dvb-frontends/stv0367.c b/drivers/media/dvb-frontends/stv0367.c
index 0bfca1174e9e7d9dc47b60efaada3d320cd614d0..8cbae8235b174c5dd795e9055e1e52189c7e0d33 100644
--- a/drivers/media/dvb-frontends/stv0367.c
+++ b/drivers/media/dvb-frontends/stv0367.c
@@ -118,50 +118,32 @@ static const s32 stv0367cab_RF_LookUp2[RF_LOOKUP_TABLE2_SIZE][RF_LOOKUP_TABLE2_S
 	}
 };
 
-static
-int stv0367_writeregs(struct stv0367_state *state, u16 reg, u8 *data, int len)
+static noinline_for_stack
+int stv0367_writereg(struct stv0367_state *state, u16 reg, u8 data)
 {
-	u8 buf[MAX_XFER_SIZE];
+	u8 buf[3] = { MSB(reg), LSB(reg), data };
 	struct i2c_msg msg = {
 		.addr = state->config->demod_address,
 		.flags = 0,
 		.buf = buf,
-		.len = len + 2
+		.len = 3,
 	};
 	int ret;
 
-	if (2 + len > sizeof(buf)) {
-		printk(KERN_WARNING
-		       "%s: i2c wr reg=%04x: len=%d is too big!\n",
-		       KBUILD_MODNAME, reg, len);
-		return -EINVAL;
-	}
-
-
-	buf[0] = MSB(reg);
-	buf[1] = LSB(reg);
-	memcpy(buf + 2, data, len);
-
 	if (i2cdebug)
 		printk(KERN_DEBUG "%s: [%02x] %02x: %02x\n", __func__,
-			state->config->demod_address, reg, buf[2]);
+			state->config->demod_address, reg, data);
 
 	ret = i2c_transfer(state->i2c, &msg, 1);
 	if (ret != 1)
 		printk(KERN_ERR "%s: i2c write error! ([%02x] %02x: %02x)\n",
-			__func__, state->config->demod_address, reg, buf[2]);
+			__func__, state->config->demod_address, reg, data);
 
 	return (ret != 1) ? -EREMOTEIO : 0;
 }
 
-static int stv0367_writereg(struct stv0367_state *state, u16 reg, u8 data)
-{
-	u8 tmp = data; /* see gcc.gnu.org/bugzilla/show_bug.cgi?id=81715 */
-
-	return stv0367_writeregs(state, reg, &tmp, 1);
-}
-
-static u8 stv0367_readreg(struct stv0367_state *state, u16 reg)
+static noinline_for_stack
+u8 stv0367_readreg(struct stv0367_state *state, u16 reg)
 {
 	u8 b0[] = { 0, 0 };
 	u8 b1[] = { 0 };
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index ed9d561b11050d43ee4cb497862750709ee7520f..702ac7d98333707374dfc0f66d04a41b618183f7 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -70,6 +70,11 @@ struct f2fs_fault_info {
 
 extern const char *f2fs_fault_name[FAULT_MAX];
 #define IS_FAULT_SET(fi, type) ((fi)->inject_type & (1 << (type)))
+
+/* maximum retry count for injected failure */
+#define DEFAULT_FAILURE_RETRY_COUNT		8
+#else
+#define DEFAULT_FAILURE_RETRY_COUNT		1
 #endif
 
 /*
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 8be510a9b4c95b55506fb082ea09140a5c2fa74f..98ec85495d8c6fbb2fda05a8098816f8ca16eef8 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -3642,10 +3642,10 @@ static int f2fs_release_compress_blocks(struct file *filp, unsigned long arg)
 	return ret;
 }
 
-static int reserve_compress_blocks(struct dnode_of_data *dn, pgoff_t count)
+static int reserve_compress_blocks(struct dnode_of_data *dn, pgoff_t count,
+		unsigned int *reserved_blocks)
 {
 	struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
-	unsigned int reserved_blocks = 0;
 	int cluster_size = F2FS_I(dn->inode)->i_cluster_size;
 	block_t blkaddr;
 	int i;
@@ -3695,12 +3695,12 @@ static int reserve_compress_blocks(struct dnode_of_data *dn, pgoff_t count)
 
 		f2fs_i_compr_blocks_update(dn->inode, compr_blocks, true);
 
-		reserved_blocks += reserved;
+		*reserved_blocks += reserved;
 next:
 		count -= cluster_size;
 	}
 
-	return reserved_blocks;
+	return 0;
 }
 
 static int f2fs_reserve_compress_blocks(struct file *filp, unsigned long arg)
@@ -3761,7 +3761,7 @@ static int f2fs_reserve_compress_blocks(struct file *filp, unsigned long arg)
 		count = min(end_offset - dn.ofs_in_node, last_idx - page_idx);
 		count = round_up(count, F2FS_I(inode)->i_cluster_size);
 
-		ret = reserve_compress_blocks(&dn, count);
+		ret = reserve_compress_blocks(&dn, count, &reserved_blocks);
 
 		f2fs_put_dnode(&dn);
 
@@ -3769,7 +3769,6 @@ static int f2fs_reserve_compress_blocks(struct file *filp, unsigned long arg)
 			break;
 
 		page_idx += count;
-		reserved_blocks += ret;
 	}
 
 	up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
@@ -3786,7 +3785,7 @@ static int f2fs_reserve_compress_blocks(struct file *filp, unsigned long arg)
 out:
 	mnt_drop_write_file(filp);
 
-	if (ret >= 0) {
+	if (!ret) {
 		ret = put_user(reserved_blocks, (u64 __user *)arg);
 	} else if (reserved_blocks &&
 			atomic_read(&F2FS_I(inode)->i_compr_blocks)) {
diff --git a/fs/f2fs/recovery.c b/fs/f2fs/recovery.c
index c3c527afdd07491774c1da7181ab2937ace8c880..2e4cac1aed76f2541950de122f2447e59a8dceeb 100644
--- a/fs/f2fs/recovery.c
+++ b/fs/f2fs/recovery.c
@@ -543,6 +543,19 @@ static int check_index_in_prev_nodes(struct f2fs_sb_info *sbi,
 	return 0;
 }
 
+static int f2fs_reserve_new_block_retry(struct dnode_of_data *dn)
+{
+	int i, err = 0;
+
+	for (i = DEFAULT_FAILURE_RETRY_COUNT; i > 0; i--) {
+		err = f2fs_reserve_new_block(dn);
+		if (!err)
+			break;
+	}
+
+	return err;
+}
+
 static int do_recover_data(struct f2fs_sb_info *sbi, struct inode *inode,
 					struct page *page)
 {
@@ -641,20 +654,17 @@ static int do_recover_data(struct f2fs_sb_info *sbi, struct inode *inode,
 		 */
 		if (dest == NEW_ADDR) {
 			f2fs_truncate_data_blocks_range(&dn, 1);
-			f2fs_reserve_new_block(&dn);
+
+			err = f2fs_reserve_new_block_retry(&dn);
+			if (err)
+				goto err;
 			continue;
 		}
 
 		/* dest is valid block, try to recover from src to dest */
 		if (f2fs_is_valid_blkaddr(sbi, dest, META_POR)) {
-
 			if (src == NULL_ADDR) {
-				err = f2fs_reserve_new_block(&dn);
-				while (err &&
-				       IS_ENABLED(CONFIG_F2FS_FAULT_INJECTION))
-					err = f2fs_reserve_new_block(&dn);
-				/* We should not get -ENOSPC */
-				f2fs_bug_on(sbi, err);
+				err = f2fs_reserve_new_block_retry(&dn);
 				if (err)
 					goto err;
 			}
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index b40780fde7915451b5a6351da7b45a1071f6e679..93ee52e530eed9721ae64ab1907b2403016c7969 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -153,6 +153,12 @@ int tcp_twsk_unique(struct sock *sk, struct sock *sktw, void *twp)
 	if (tcptw->tw_ts_recent_stamp &&
 	    (!twp || (reuse && time_after32(ktime_get_seconds(),
 					    tcptw->tw_ts_recent_stamp)))) {
+		/* inet_twsk_hashdance() sets sk_refcnt after putting twsk
+		 * and releasing the bucket lock.
+		 */
+		if (unlikely(!refcount_inc_not_zero(&sktw->sk_refcnt)))
+			return 0;
+
 		/* In case of repair and re-using TIME-WAIT sockets we still
 		 * want to be sure that it is safe as above but honor the
 		 * sequence numbers and time stamps set as part of the repair
@@ -173,7 +179,7 @@ int tcp_twsk_unique(struct sock *sk, struct sock *sktw, void *twp)
 			tp->rx_opt.ts_recent	   = tcptw->tw_ts_recent;
 			tp->rx_opt.ts_recent_stamp = tcptw->tw_ts_recent_stamp;
 		}
-		sock_hold(sktw);
+
 		return 1;
 	}