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powerpc/pseries/ddw: simplify enable_ddw()

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[ Upstream commit fb4ee2b30c ]

This drops rather useless ddw_enabled flag as direct_mapping implies
it anyway.

While at this, fix indents in enable_ddw().

This should not cause any behavioral change.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211108040320.3857636-3-aik@ozlabs.ru
Stable-dep-of: 3bf983e4e9 ("powerpc/pseries/iommu: enable_ddw incorrectly returns direct mapping for SR-IOV device")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Alexey Kardashevskiy 2021-11-08 15:03:18 +11:00 committed by Greg Kroah-Hartman
parent b3e993de40
commit ad0b74d0f3
1 changed files with 4 additions and 7 deletions
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11
arch/powerpc/platforms/pseries/iommu.c
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@ -1241,7 +1241,6 @@ static bool enable_ddw(struct pci_dev *dev, struct device_node *pdn)
u32 ddw_avail[DDW_APPLICABLE_SIZE];
struct dma_win *window;
struct property *win64;
bool ddw_enabled = false;
struct failed_ddw_pdn *fpdn;
bool default_win_removed = false, direct_mapping = false;
bool pmem_present;
@ -1256,7 +1255,6 @@ static bool enable_ddw(struct pci_dev *dev, struct device_node *pdn)
if (find_existing_ddw(pdn, &dev->dev.archdata.dma_offset, &len)) {
direct_mapping = (len >= max_ram_len);
ddw_enabled = true;
goto out_unlock;
}
@ -1411,8 +1409,8 @@ static bool enable_ddw(struct pci_dev *dev, struct device_node *pdn)
dev_info(&dev->dev, "failed to map DMA window for %pOF: %d\n",
dn, ret);
/* Make sure to clean DDW if any TCE was set*/
clean_dma_window(pdn, win64->value);
/* Make sure to clean DDW if any TCE was set*/
clean_dma_window(pdn, win64->value);
goto out_del_list;
}
} else {
@ -1459,7 +1457,6 @@ static bool enable_ddw(struct pci_dev *dev, struct device_node *pdn)
spin_unlock(&dma_win_list_lock);
dev->dev.archdata.dma_offset = win_addr;
ddw_enabled = true;
goto out_unlock;
out_del_list:
@ -1495,10 +1492,10 @@ out_unlock:
* as RAM, then we failed to create a window to cover persistent
* memory and need to set the DMA limit.
*/
if (pmem_present && ddw_enabled && direct_mapping && len == max_ram_len)
if (pmem_present && direct_mapping && len == max_ram_len)
dev->dev.bus_dma_limit = dev->dev.archdata.dma_offset + (1ULL << len);
return ddw_enabled && direct_mapping;
return direct_mapping;
}
static void pci_dma_dev_setup_pSeriesLP(struct pci_dev *dev)