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wifi: mt76: mt7915: add locking for accessing mapped registers

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[ Upstream commit 0937f95ab0 ]

Sicne the mapping is global, mapped register access needs to be protected
against concurrent access, otherwise a race condition might cause the reads
or writes to go towards the wrong register

Signed-off-by: Shayne Chen <shayne.chen@mediatek.com>
Signed-off-by: Peter Chiu <chui-hao.chiu@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Shayne Chen 2023-08-15 17:28:30 +08:00 committed by Greg Kroah-Hartman
parent 2505a75a38
commit 9864f58eb2
2 changed files with 41 additions and 5 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

45
drivers/net/wireless/mediatek/mt76/mt7915/mmio.c
View file

@ -490,6 +490,11 @@ static u32 __mt7915_reg_addr(struct mt7915_dev *dev, u32 addr)
return dev->reg.map[i].maps + ofs;
}
return 0;
}
static u32 __mt7915_reg_remap_addr(struct mt7915_dev *dev, u32 addr)
{
if ((addr >= MT_INFRA_BASE && addr < MT_WFSYS0_PHY_START) ||
(addr >= MT_WFSYS0_PHY_START && addr < MT_WFSYS1_PHY_START) ||
(addr >= MT_WFSYS1_PHY_START && addr <= MT_WFSYS1_PHY_END))
@ -514,15 +519,30 @@ void mt7915_memcpy_fromio(struct mt7915_dev *dev, void *buf, u32 offset,
{
u32 addr = __mt7915_reg_addr(dev, offset);
memcpy_fromio(buf, dev->mt76.mmio.regs + addr, len);
if (addr) {
memcpy_fromio(buf, dev->mt76.mmio.regs + addr, len);
return;
}
spin_lock_bh(&dev->reg_lock);
memcpy_fromio(buf, dev->mt76.mmio.regs +
__mt7915_reg_remap_addr(dev, offset), len);
spin_unlock_bh(&dev->reg_lock);
}
static u32 mt7915_rr(struct mt76_dev *mdev, u32 offset)
{
struct mt7915_dev *dev = container_of(mdev, struct mt7915_dev, mt76);
u32 addr = __mt7915_reg_addr(dev, offset);
u32 addr = __mt7915_reg_addr(dev, offset), val;
return dev->bus_ops->rr(mdev, addr);
if (addr)
return dev->bus_ops->rr(mdev, addr);
spin_lock_bh(&dev->reg_lock);
val = dev->bus_ops->rr(mdev, __mt7915_reg_remap_addr(dev, offset));
spin_unlock_bh(&dev->reg_lock);
return val;
}
static void mt7915_wr(struct mt76_dev *mdev, u32 offset, u32 val)
@ -530,7 +550,14 @@ static void mt7915_wr(struct mt76_dev *mdev, u32 offset, u32 val)
struct mt7915_dev *dev = container_of(mdev, struct mt7915_dev, mt76);
u32 addr = __mt7915_reg_addr(dev, offset);
dev->bus_ops->wr(mdev, addr, val);
if (addr) {
dev->bus_ops->wr(mdev, addr, val);
return;
}
spin_lock_bh(&dev->reg_lock);
dev->bus_ops->wr(mdev, __mt7915_reg_remap_addr(dev, offset), val);
spin_unlock_bh(&dev->reg_lock);
}
static u32 mt7915_rmw(struct mt76_dev *mdev, u32 offset, u32 mask, u32 val)
@ -538,7 +565,14 @@ static u32 mt7915_rmw(struct mt76_dev *mdev, u32 offset, u32 mask, u32 val)
struct mt7915_dev *dev = container_of(mdev, struct mt7915_dev, mt76);
u32 addr = __mt7915_reg_addr(dev, offset);
return dev->bus_ops->rmw(mdev, addr, mask, val);
if (addr)
return dev->bus_ops->rmw(mdev, addr, mask, val);
spin_lock_bh(&dev->reg_lock);
val = dev->bus_ops->rmw(mdev, __mt7915_reg_remap_addr(dev, offset), mask, val);
spin_unlock_bh(&dev->reg_lock);
return val;
}
#ifdef CONFIG_NET_MEDIATEK_SOC_WED
@ -707,6 +741,7 @@ static int mt7915_mmio_init(struct mt76_dev *mdev,
dev = container_of(mdev, struct mt7915_dev, mt76);
mt76_mmio_init(&dev->mt76, mem_base);
spin_lock_init(&dev->reg_lock);
switch (device_id) {
case 0x7915:

1
drivers/net/wireless/mediatek/mt76/mt7915/mt7915.h
View file

@ -287,6 +287,7 @@ struct mt7915_dev {
struct list_head sta_rc_list;
struct list_head twt_list;
spinlock_t reg_lock;
u32 hw_pattern;