From: Zachary Amsden <zach@xxxxxxxxxx>
I got so sick of seing the check_region warnings from BusLogic.c I actually
fixed it properly. Never use check region, reserve it before the probe
with request region instead and check the error result; free region if
setup fails. Should be functionally identical to the original except for
fixing the potential race.
Signed-off-by: Zachary Amsden <zach@xxxxxxxxxx>
Cc: James Bottomley <James.Bottomley@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/scsi/BusLogic.c | 73 ++++++++++++++++++++++++--------------
1 file changed, 48 insertions(+), 25 deletions(-)
diff -puN drivers/scsi/BusLogic.c~fix-buslogic-to-stop-using-check_region drivers/scsi/BusLogic.c
--- a/drivers/scsi/BusLogic.c~fix-buslogic-to-stop-using-check_region
+++ a/drivers/scsi/BusLogic.c
@@ -579,17 +579,17 @@ static void __init BusLogic_InitializePr
/*
Append the list of standard BusLogic MultiMaster ISA I/O Addresses.
*/
- if (BusLogic_ProbeOptions.LimitedProbeISA ? BusLogic_ProbeOptions.Probe330 : check_region(0x330, BusLogic_MultiMasterAddressCount) == 0)
+ if (!BusLogic_ProbeOptions.LimitedProbeISA || BusLogic_ProbeOptions.Probe330)
BusLogic_AppendProbeAddressISA(0x330);
- if (BusLogic_ProbeOptions.LimitedProbeISA ? BusLogic_ProbeOptions.Probe334 : check_region(0x334, BusLogic_MultiMasterAddressCount) == 0)
+ if (!BusLogic_ProbeOptions.LimitedProbeISA || BusLogic_ProbeOptions.Probe334)
BusLogic_AppendProbeAddressISA(0x334);
- if (BusLogic_ProbeOptions.LimitedProbeISA ? BusLogic_ProbeOptions.Probe230 : check_region(0x230, BusLogic_MultiMasterAddressCount) == 0)
+ if (!BusLogic_ProbeOptions.LimitedProbeISA || BusLogic_ProbeOptions.Probe230)
BusLogic_AppendProbeAddressISA(0x230);
- if (BusLogic_ProbeOptions.LimitedProbeISA ? BusLogic_ProbeOptions.Probe234 : check_region(0x234, BusLogic_MultiMasterAddressCount) == 0)
+ if (!BusLogic_ProbeOptions.LimitedProbeISA || BusLogic_ProbeOptions.Probe234)
BusLogic_AppendProbeAddressISA(0x234);
- if (BusLogic_ProbeOptions.LimitedProbeISA ? BusLogic_ProbeOptions.Probe130 : check_region(0x130, BusLogic_MultiMasterAddressCount) == 0)
+ if (!BusLogic_ProbeOptions.LimitedProbeISA || BusLogic_ProbeOptions.Probe130)
BusLogic_AppendProbeAddressISA(0x130);
- if (BusLogic_ProbeOptions.LimitedProbeISA ? BusLogic_ProbeOptions.Probe134 : check_region(0x134, BusLogic_MultiMasterAddressCount) == 0)
+ if (!BusLogic_ProbeOptions.LimitedProbeISA || BusLogic_ProbeOptions.Probe134)
BusLogic_AppendProbeAddressISA(0x134);
}
@@ -795,7 +795,9 @@ static int __init BusLogic_InitializeMul
host adapters are probed.
*/
if (!BusLogic_ProbeOptions.NoProbeISA)
- if (PrimaryProbeInfo->IO_Address == 0 && (BusLogic_ProbeOptions.LimitedProbeISA ? BusLogic_ProbeOptions.Probe330 : check_region(0x330, BusLogic_MultiMasterAddressCount) == 0)) {
+ if (PrimaryProbeInfo->IO_Address == 0 &&
+ (!BusLogic_ProbeOptions.LimitedProbeISA ||
+ BusLogic_ProbeOptions.Probe330)) {
PrimaryProbeInfo->HostAdapterType = BusLogic_MultiMaster;
PrimaryProbeInfo->HostAdapterBusType = BusLogic_ISA_Bus;
PrimaryProbeInfo->IO_Address = 0x330;
@@ -805,15 +807,25 @@ static int __init BusLogic_InitializeMul
omitting the Primary I/O Address which has already been handled.
*/
if (!BusLogic_ProbeOptions.NoProbeISA) {
- if (!StandardAddressSeen[1] && (BusLogic_ProbeOptions.LimitedProbeISA ? BusLogic_ProbeOptions.Probe334 : check_region(0x334, BusLogic_MultiMasterAddressCount) == 0))
+ if (!StandardAddressSeen[1] &&
+ (!BusLogic_ProbeOptions.LimitedProbeISA ||
+ BusLogic_ProbeOptions.Probe334))
BusLogic_AppendProbeAddressISA(0x334);
- if (!StandardAddressSeen[2] && (BusLogic_ProbeOptions.LimitedProbeISA ? BusLogic_ProbeOptions.Probe230 : check_region(0x230, BusLogic_MultiMasterAddressCount) == 0))
+ if (!StandardAddressSeen[2] &&
+ (!BusLogic_ProbeOptions.LimitedProbeISA ||
+ BusLogic_ProbeOptions.Probe230))
BusLogic_AppendProbeAddressISA(0x230);
- if (!StandardAddressSeen[3] && (BusLogic_ProbeOptions.LimitedProbeISA ? BusLogic_ProbeOptions.Probe234 : check_region(0x234, BusLogic_MultiMasterAddressCount) == 0))
+ if (!StandardAddressSeen[3] &&
+ (!BusLogic_ProbeOptions.LimitedProbeISA ||
+ BusLogic_ProbeOptions.Probe234))
BusLogic_AppendProbeAddressISA(0x234);
- if (!StandardAddressSeen[4] && (BusLogic_ProbeOptions.LimitedProbeISA ? BusLogic_ProbeOptions.Probe130 : check_region(0x130, BusLogic_MultiMasterAddressCount) == 0))
+ if (!StandardAddressSeen[4] &&
+ (!BusLogic_ProbeOptions.LimitedProbeISA ||
+ BusLogic_ProbeOptions.Probe130))
BusLogic_AppendProbeAddressISA(0x130);
- if (!StandardAddressSeen[5] && (BusLogic_ProbeOptions.LimitedProbeISA ? BusLogic_ProbeOptions.Probe134 : check_region(0x134, BusLogic_MultiMasterAddressCount) == 0))
+ if (!StandardAddressSeen[5] &&
+ (!BusLogic_ProbeOptions.LimitedProbeISA ||
+ BusLogic_ProbeOptions.Probe134))
BusLogic_AppendProbeAddressISA(0x134);
}
/*
@@ -2220,22 +2232,35 @@ static int __init BusLogic_init(void)
HostAdapter->PCI_Device = ProbeInfo->PCI_Device;
HostAdapter->IRQ_Channel = ProbeInfo->IRQ_Channel;
HostAdapter->AddressCount = BusLogic_HostAdapterAddressCount[HostAdapter->HostAdapterType];
+
+ /*
+ Make sure region is free prior to probing.
+ */
+ if (!request_region(HostAdapter->IO_Address, HostAdapter->AddressCount,
+ "BusLogic"))
+ continue;
/*
Probe the Host Adapter. If unsuccessful, abort further initialization.
*/
- if (!BusLogic_ProbeHostAdapter(HostAdapter))
+ if (!BusLogic_ProbeHostAdapter(HostAdapter)) {
+ release_region(HostAdapter->IO_Address, HostAdapter->AddressCount);
continue;
+ }
/*
Hard Reset the Host Adapter. If unsuccessful, abort further
initialization.
*/
- if (!BusLogic_HardwareResetHostAdapter(HostAdapter, true))
+ if (!BusLogic_HardwareResetHostAdapter(HostAdapter, true)) {
+ release_region(HostAdapter->IO_Address, HostAdapter->AddressCount);
continue;
+ }
/*
Check the Host Adapter. If unsuccessful, abort further initialization.
*/
- if (!BusLogic_CheckHostAdapter(HostAdapter))
+ if (!BusLogic_CheckHostAdapter(HostAdapter)) {
+ release_region(HostAdapter->IO_Address, HostAdapter->AddressCount);
continue;
+ }
/*
Initialize the Driver Options field if provided.
*/
@@ -2247,16 +2272,6 @@ static int __init BusLogic_init(void)
*/
BusLogic_AnnounceDriver(HostAdapter);
/*
- Register usage of the I/O Address range. From this point onward, any
- failure will be assumed to be due to a problem with the Host Adapter,
- rather than due to having mistakenly identified this port as belonging
- to a BusLogic Host Adapter. The I/O Address range will not be
- released, thereby preventing it from being incorrectly identified as
- any other type of Host Adapter.
- */
- if (!request_region(HostAdapter->IO_Address, HostAdapter->AddressCount, "BusLogic"))
- continue;
- /*
Register the SCSI Host structure.
*/
@@ -2280,6 +2295,12 @@ static int __init BusLogic_init(void)
Acquire the System Resources necessary to use the Host Adapter, then
Create the Initial CCBs, Initialize the Host Adapter, and finally
perform Target Device Inquiry.
+
+ From this point onward, any failure will be assumed to be due to a
+ problem with the Host Adapter, rather than due to having mistakenly
+ identified this port as belonging to a BusLogic Host Adapter. The
+ I/O Address range will not be released, thereby preventing it from
+ being incorrectly identified as any other type of Host Adapter.
*/
if (BusLogic_ReadHostAdapterConfiguration(HostAdapter) &&
BusLogic_ReportHostAdapterConfiguration(HostAdapter) &&
@@ -3598,6 +3619,7 @@ static void __exit BusLogic_exit(void)
__setup("BusLogic=", BusLogic_Setup);
+#ifdef MODULE
static struct pci_device_id BusLogic_pci_tbl[] __devinitdata = {
{ PCI_VENDOR_ID_BUSLOGIC, PCI_DEVICE_ID_BUSLOGIC_MULTIMASTER,
PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
@@ -3607,6 +3629,7 @@ static struct pci_device_id BusLogic_pci
PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
{ }
};
+#endif
MODULE_DEVICE_TABLE(pci, BusLogic_pci_tbl);
module_init(BusLogic_init);
_
-
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