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path: root/drivers/misc/cxl/vphb.c
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Diffstat (limited to 'drivers/misc/cxl/vphb.c')
-rw-r--r--drivers/misc/cxl/vphb.c18
1 files changed, 14 insertions, 4 deletions
diff --git a/drivers/misc/cxl/vphb.c b/drivers/misc/cxl/vphb.c
index 639a343b7836..512a4897dbf6 100644
--- a/drivers/misc/cxl/vphb.c
+++ b/drivers/misc/cxl/vphb.c
@@ -83,6 +83,16 @@ static inline struct cxl_afu *pci_bus_to_afu(struct pci_bus *bus)
return phb ? phb->private_data : NULL;
}
+static void cxl_afu_configured_put(struct cxl_afu *afu)
+{
+ atomic_dec_if_positive(&afu->configured_state);
+}
+
+static bool cxl_afu_configured_get(struct cxl_afu *afu)
+{
+ return atomic_inc_unless_negative(&afu->configured_state);
+}
+
static inline int cxl_pcie_config_info(struct pci_bus *bus, unsigned int devfn,
struct cxl_afu *afu, int *_record)
{
@@ -107,7 +117,7 @@ static int cxl_pcie_read_config(struct pci_bus *bus, unsigned int devfn,
afu = pci_bus_to_afu(bus);
/* Grab a reader lock on afu. */
- if (afu == NULL || !down_read_trylock(&afu->configured_rwsem))
+ if (afu == NULL || !cxl_afu_configured_get(afu))
return PCIBIOS_DEVICE_NOT_FOUND;
rc = cxl_pcie_config_info(bus, devfn, afu, &record);
@@ -132,7 +142,7 @@ static int cxl_pcie_read_config(struct pci_bus *bus, unsigned int devfn,
}
out:
- up_read(&afu->configured_rwsem);
+ cxl_afu_configured_put(afu);
return rc ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
}
@@ -144,7 +154,7 @@ static int cxl_pcie_write_config(struct pci_bus *bus, unsigned int devfn,
afu = pci_bus_to_afu(bus);
/* Grab a reader lock on afu. */
- if (afu == NULL || !down_read_trylock(&afu->configured_rwsem))
+ if (afu == NULL || !cxl_afu_configured_get(afu))
return PCIBIOS_DEVICE_NOT_FOUND;
rc = cxl_pcie_config_info(bus, devfn, afu, &record);
@@ -166,7 +176,7 @@ static int cxl_pcie_write_config(struct pci_bus *bus, unsigned int devfn,
}
out:
- up_read(&afu->configured_rwsem);
+ cxl_afu_configured_put(afu);
return rc ? PCIBIOS_SET_FAILED : PCIBIOS_SUCCESSFUL;
}