[PATCH AUTOSEL 4.4 04/40] powerpc/iommu: Avoid derefence before pointer check

[PATCH AUTOSEL 4.4 04/40] powerpc/iommu: Avoid derefence before pointer check

[Sasha Levin]

From: Breno Leitao <leitao@debian.org>

[ Upstream commit 984ecdd68de0fa1f63ce205d6c19ef5a7bc67b40 ]

The tbl pointer is being derefenced by IOMMU_PAGE_SIZE prior the check
if it is not NULL.

Just moving the dereference code to after the check, where there will
be guarantee that 'tbl' will not be NULL.

Signed-off-by: Breno Leitao <leitao@debian.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 arch/powerpc/kernel/iommu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/kernel/iommu.c b/arch/powerpc/kernel/iommu.c
index a8e3490b54e3b..4c9b5970af371 100644
--- a/arch/powerpc/kernel/iommu.c
+++ b/arch/powerpc/kernel/iommu.c
@@ -764,9 +764,9 @@ dma_addr_t iommu_map_page(struct device *dev, struct iommu_table *tbl,
 
 	vaddr = page_address(page) + offset;
 	uaddr = (unsigned long)vaddr;
-	npages = iommu_num_pages(uaddr, size, IOMMU_PAGE_SIZE(tbl));
 
 	if (tbl) {
+		npages = iommu_num_pages(uaddr, size, IOMMU_PAGE_SIZE(tbl));
 		align = 0;
 		if (tbl->it_page_shift < PAGE_SHIFT && size >= PAGE_SIZE &&
 		    ((unsigned long)vaddr & ~PAGE_MASK) == 0)
-- 
2.20.1

[PATCH AUTOSEL 4.4 05/40] powerpc/64s/hash: Fix stab_rr off by one initialization

[Sasha Levin]

From: Nicholas Piggin <npiggin@gmail.com>

[ Upstream commit 09b4438db13fa83b6219aee5993711a2aa2a0c64 ]

This causes SLB alloation to start 1 beyond the start of the SLB.
There is no real problem because after it wraps it stats behaving
properly, it's just surprisig to see when looking at SLB traces.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 arch/powerpc/mm/slb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/mm/slb.c b/arch/powerpc/mm/slb.c
index 309027208f7c0..27f00a7c1085f 100644
--- a/arch/powerpc/mm/slb.c
+++ b/arch/powerpc/mm/slb.c
@@ -322,7 +322,7 @@ void slb_initialize(void)
 #endif
 	}
 
-	get_paca()->stab_rr = SLB_NUM_BOLTED;
+	get_paca()->stab_rr = SLB_NUM_BOLTED - 1;
 
 	lflags = SLB_VSID_KERNEL | linear_llp;
 	vflags = SLB_VSID_KERNEL | vmalloc_llp;
-- 
2.20.1

[PATCH AUTOSEL 4.4 06/40] powerpc/pseries: Disable CPU hotplug across migrations

[Sasha Levin]

From: Nathan Fontenot <nfont@linux.vnet.ibm.com>

[ Upstream commit 85a88cabad57d26d826dd94ea34d3a785824d802 ]

When performing partition migrations all present CPUs must be online
as all present CPUs must make the H_JOIN call as part of the migration
process. Once all present CPUs make the H_JOIN call, one CPU is returned
to make the rtas call to perform the migration to the destination system.

During testing of migration and changing the SMT state we have found
instances where CPUs are offlined, as part of the SMT state change,
before they make the H_JOIN call. This results in a hung system where
every CPU is either in H_JOIN or offline.

To prevent this this patch disables CPU hotplug during the migration
process.

Signed-off-by: Nathan Fontenot <nfont@linux.vnet.ibm.com>
Reviewed-by: Tyrel Datwyler <tyreld@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 arch/powerpc/kernel/rtas.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/powerpc/kernel/rtas.c b/arch/powerpc/kernel/rtas.c
index 0c42e872d548b..4fcaa7d3d544f 100644
--- a/arch/powerpc/kernel/rtas.c
+++ b/arch/powerpc/kernel/rtas.c
@@ -967,6 +967,7 @@ int rtas_ibm_suspend_me(u64 handle)
 		goto out;
 	}
 
+	cpu_hotplug_disable();
 	stop_topology_update();
 
 	/* Call function on all CPUs.  One of us will make the
@@ -981,6 +982,7 @@ int rtas_ibm_suspend_me(u64 handle)
 		printk(KERN_ERR "Error doing global join\n");
 
 	start_topology_update();
+	cpu_hotplug_enable();
 
 	/* Take down CPUs not online prior to suspend */
 	cpuret = rtas_offline_cpus_mask(offline_mask);
-- 
2.20.1

[PATCH AUTOSEL 4.4 07/40] libfdt: Ensure INT_MAX is defined in libfdt_env.h

[Sasha Levin]

From: Rob Herring <robh@kernel.org>

[ Upstream commit 53dd9dce6979bc54d64a3a09a2fb20187a025be7 ]

The next update of libfdt has a new dependency on INT_MAX. Update the
instances of libfdt_env.h in the kernel to either include the necessary
header with the definition or define it locally.

Cc: Russell King <linux@armlinux.org.uk>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 arch/arm/boot/compressed/libfdt_env.h | 2 ++
 arch/powerpc/boot/libfdt_env.h        | 2 ++
 include/linux/libfdt_env.h            | 1 +
 3 files changed, 5 insertions(+)

diff --git a/arch/arm/boot/compressed/libfdt_env.h b/arch/arm/boot/compressed/libfdt_env.h
index 17ae0f3efac8e..005bf4ff1b4cb 100644
--- a/arch/arm/boot/compressed/libfdt_env.h
+++ b/arch/arm/boot/compressed/libfdt_env.h
@@ -5,6 +5,8 @@
 #include <linux/string.h>
 #include <asm/byteorder.h>
 
+#define INT_MAX			((int)(~0U>>1))
+
 typedef __be16 fdt16_t;
 typedef __be32 fdt32_t;
 typedef __be64 fdt64_t;
diff --git a/arch/powerpc/boot/libfdt_env.h b/arch/powerpc/boot/libfdt_env.h
index 7e3789ea396b8..0b3db6322c793 100644
--- a/arch/powerpc/boot/libfdt_env.h
+++ b/arch/powerpc/boot/libfdt_env.h
@@ -4,6 +4,8 @@
 #include <types.h>
 #include <string.h>
 
+#define INT_MAX			((int)(~0U>>1))
+
 #include "of.h"
 
 typedef u32 uint32_t;
diff --git a/include/linux/libfdt_env.h b/include/linux/libfdt_env.h
index 2a663c6bb4285..8850e243c9406 100644
--- a/include/linux/libfdt_env.h
+++ b/include/linux/libfdt_env.h
@@ -1,6 +1,7 @@
 #ifndef _LIBFDT_ENV_H
 #define _LIBFDT_ENV_H
 
+#include <linux/kernel.h>	/* For INT_MAX */
 #include <linux/string.h>
 
 #include <asm/byteorder.h>
-- 
2.20.1

[PATCH AUTOSEL 4.4 10/40] net: toshiba: fix return type of ndo_start_xmit function

[Sasha Levin]

From: YueHaibing <yuehaibing@huawei.com>

[ Upstream commit bacade822524e02f662d88f784d2ae821a5546fb ]

The method ndo_start_xmit() is defined as returning an 'netdev_tx_t',
which is a typedef for an enum type, so make sure the implementation in
this driver has returns 'netdev_tx_t' value, and change the function
return type to netdev_tx_t.

Found by coccinelle.

Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/ethernet/toshiba/ps3_gelic_net.c | 4 ++--
 drivers/net/ethernet/toshiba/ps3_gelic_net.h | 2 +-
 drivers/net/ethernet/toshiba/spider_net.c    | 4 ++--
 drivers/net/ethernet/toshiba/tc35815.c       | 6 ++++--
 4 files changed, 9 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/toshiba/ps3_gelic_net.c b/drivers/net/ethernet/toshiba/ps3_gelic_net.c
index 79f0ec4e51ace..964df98b54ea1 100644
--- a/drivers/net/ethernet/toshiba/ps3_gelic_net.c
+++ b/drivers/net/ethernet/toshiba/ps3_gelic_net.c
@@ -845,9 +845,9 @@ static int gelic_card_kick_txdma(struct gelic_card *card,
  * @skb: packet to send out
  * @netdev: interface device structure
  *
- * returns 0 on success, <0 on failure
+ * returns NETDEV_TX_OK on success, NETDEV_TX_BUSY on failure
  */
-int gelic_net_xmit(struct sk_buff *skb, struct net_device *netdev)
+netdev_tx_t gelic_net_xmit(struct sk_buff *skb, struct net_device *netdev)
 {
 	struct gelic_card *card = netdev_card(netdev);
 	struct gelic_descr *descr;
diff --git a/drivers/net/ethernet/toshiba/ps3_gelic_net.h b/drivers/net/ethernet/toshiba/ps3_gelic_net.h
index 8505196be9f52..d123644bd720b 100644
--- a/drivers/net/ethernet/toshiba/ps3_gelic_net.h
+++ b/drivers/net/ethernet/toshiba/ps3_gelic_net.h
@@ -370,7 +370,7 @@ void gelic_card_up(struct gelic_card *card);
 void gelic_card_down(struct gelic_card *card);
 int gelic_net_open(struct net_device *netdev);
 int gelic_net_stop(struct net_device *netdev);
-int gelic_net_xmit(struct sk_buff *skb, struct net_device *netdev);
+netdev_tx_t gelic_net_xmit(struct sk_buff *skb, struct net_device *netdev);
 void gelic_net_set_multi(struct net_device *netdev);
 void gelic_net_tx_timeout(struct net_device *netdev);
 int gelic_net_change_mtu(struct net_device *netdev, int new_mtu);
diff --git a/drivers/net/ethernet/toshiba/spider_net.c b/drivers/net/ethernet/toshiba/spider_net.c
index 3c54a2cae5dfd..8e53211aedd82 100644
--- a/drivers/net/ethernet/toshiba/spider_net.c
+++ b/drivers/net/ethernet/toshiba/spider_net.c
@@ -881,9 +881,9 @@ spider_net_kick_tx_dma(struct spider_net_card *card)
  * @skb: packet to send out
  * @netdev: interface device structure
  *
- * returns 0 on success, !0 on failure
+ * returns NETDEV_TX_OK on success, NETDEV_TX_BUSY on failure
  */
-static int
+static netdev_tx_t
 spider_net_xmit(struct sk_buff *skb, struct net_device *netdev)
 {
 	int cnt;
diff --git a/drivers/net/ethernet/toshiba/tc35815.c b/drivers/net/ethernet/toshiba/tc35815.c
index 868fb6306df02..3e33c165a4278 100644
--- a/drivers/net/ethernet/toshiba/tc35815.c
+++ b/drivers/net/ethernet/toshiba/tc35815.c
@@ -475,7 +475,8 @@ static void free_rxbuf_skb(struct pci_dev *hwdev, struct sk_buff *skb, dma_addr_
 /* Index to functions, as function prototypes. */
 
 static int	tc35815_open(struct net_device *dev);
-static int	tc35815_send_packet(struct sk_buff *skb, struct net_device *dev);
+static netdev_tx_t	tc35815_send_packet(struct sk_buff *skb,
+					    struct net_device *dev);
 static irqreturn_t	tc35815_interrupt(int irq, void *dev_id);
 static int	tc35815_rx(struct net_device *dev, int limit);
 static int	tc35815_poll(struct napi_struct *napi, int budget);
@@ -1279,7 +1280,8 @@ tc35815_open(struct net_device *dev)
  * invariant will hold if you make sure that the netif_*_queue()
  * calls are done at the proper times.
  */
-static int tc35815_send_packet(struct sk_buff *skb, struct net_device *dev)
+static netdev_tx_t
+tc35815_send_packet(struct sk_buff *skb, struct net_device *dev)
 {
 	struct tc35815_local *lp = netdev_priv(dev);
 	struct TxFD *txfd;
-- 
2.20.1