From 2074a106f52b6371885afbd714e929d60d0e3f64 Mon Sep 17 00:00:00 2001 From: Alan Cox Date: Thu, 24 May 2007 02:42:38 +0200 Subject: [PATCH] ide/pci/serverworks.c: Fix corruption/timeouts with MegaIDE It turns out from customer reports to Red Hat and some PCI dumps that the MegaIDE in RAID mode doesn't provide the drive tuning data that the serverworks driver expects but sometimes does provide something that fools the code. For the RAID class case skip the oem setup and don't trust the BIOS data. We then tune from scratch and this sorts it out. (This has been confirmed on an afflicted IBM blade) [libata serverworks.c never trusts the BIOS in the first place so is accidentally immune] Signed-off-by: Alan Cox Signed-off-by: Bartlomiej Zolnierkiewicz --- drivers/ide/pci/serverworks.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/ide/pci/serverworks.c b/drivers/ide/pci/serverworks.c index 6234f806c6b..1f80c6d5880 100644 --- a/drivers/ide/pci/serverworks.c +++ b/drivers/ide/pci/serverworks.c @@ -158,6 +158,12 @@ static int svwks_tune_chipset (ide_drive_t *drive, u8 xferspeed) pci_read_config_word(dev, 0x4A, &csb5_pio); pci_read_config_byte(dev, 0x54, &ultra_enable); + /* If we are in RAID mode (eg AMI MegaIDE) then we can't it + turns out trust the firmware configuration */ + + if ((dev->class >> 8) != PCI_CLASS_STORAGE_IDE) + goto oem_setup_failed; + /* Per Specified Design by OEM, and ASIC Architect */ if ((dev->device == PCI_DEVICE_ID_SERVERWORKS_CSB6IDE) || (dev->device == PCI_DEVICE_ID_SERVERWORKS_CSB6IDE2)) { -- 2.20.1