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authorBjorn Helgaas <bhelgaas@google.com>2012-11-07 02:04:44 +0400
committerJames Bottomley <JBottomley@Parallels.com>2013-01-29 06:55:06 +0400
commit8108de9739abeec72f4811532109695e245df42a (patch)
treed7561a7747deee5ffb61e2a83c5c907a2b5d60f2 /drivers/scsi/gdth.c
parentf94d4fe0b5bbe8385245a1d9ef11d785c05df0da (diff)
downloadlinux-8108de9739abeec72f4811532109695e245df42a.tar.xz
[SCSI] gdth: Remove buggy ROM handling
The ROM address handling in gdth_init_pci() is useless and possibly dangerous. This patch removes it. "pci_resource_start(pdev, 8)" is not well-defined. PCI resources 0-5 are standard PCI BARs and 6 is the expansion ROM. Resource 8 is either an SR-IOV BAR (if CONFIG_PCI_IOV=y, resources 7-12 are SR-IOV BARs) or a bridge window (resources 7-10). The GDT device is neither an SR-IOV device nor a bridge, so in either case resource 8 should be zero since struct pci_dev is allocated with kzalloc(). It is illegal for a driver to write an arbitrary address to the ROM BAR because it has no way of knowing whether the ROM will conflict with another device. I think the only effect of the code being removed was to: 1) Enable the ROM at 0xFEFF0000 (possibly causing a conflict with another device) 2) Delay one millisecond 3) Write zero to the ROM BAR, disabling it I doubt the delay is needed, but I left it since it seems innocuous. Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'drivers/scsi/gdth.c')
-rw-r--r--drivers/scsi/gdth.c10
1 files changed, 2 insertions, 8 deletions
diff --git a/drivers/scsi/gdth.c b/drivers/scsi/gdth.c
index 599790e41a98..59bceac51a4c 100644
--- a/drivers/scsi/gdth.c
+++ b/drivers/scsi/gdth.c
@@ -1107,14 +1107,8 @@ static int gdth_init_pci(struct pci_dev *pdev, gdth_pci_str *pcistr,
pci_read_config_word(pdev, PCI_COMMAND, &command);
command |= 6;
pci_write_config_word(pdev, PCI_COMMAND, command);
- if (pci_resource_start(pdev, 8) == 1UL)
- pci_resource_start(pdev, 8) = 0UL;
- i = 0xFEFF0001UL;
- pci_write_config_dword(pdev, PCI_ROM_ADDRESS, i);
- gdth_delay(1);
- pci_write_config_dword(pdev, PCI_ROM_ADDRESS,
- pci_resource_start(pdev, 8));
-
+ gdth_delay(1);
+
dp6m_ptr = ha->brd;
/* Ensure that it is safe to access the non HW portions of DPMEM.