Roland Dreier wrote:
quoted text
> It seems that commit 305d2a1a ("libata: unify mechanism to request
> follow-up SRST") causes sata_nv not to see the HD on a system I have
> here; with current git (80750147), I get this in my bootlog:
> 
> [    2.425108] Driver 'sd' needs updating - please use bus_type methods
> [    2.435751] ACPI: PCI Interrupt Link [LSA0] enabled at IRQ 23
> [    2.441508] ACPI: PCI Interrupt 0000:00:05.0[A] -> Link [LSA0] -> GSI 23 (level, low) -> IRQ 23
> [    2.452929] sata_nv 0000:00:05.0: Using SWNCQ mode
> [    2.457892] scsi0 : sata_nv
> [    2.461813] scsi1 : sata_nv
> [    2.465891] ata1: SATA max UDMA/133 cmd 0xd480 ctl 0xd400 bmdma 0xcc00 irq 23
> [    2.473034] ata2: SATA max UDMA/133 cmd 0xd080 ctl 0xd000 bmdma 0xcc08 irq 23
> [    2.565962] ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
> [    3.003517] ata2: SATA link down (SStatus 0 SControl 300)
> [    3.137171] ACPI: PCI Interrupt Link [LSA1] enabled at IRQ 22
> [    3.142926] ACPI: PCI Interrupt 0000:00:05.1[B] -> Link [LSA1] -> GSI 22 (level, low) -> IRQ 22
> [    3.151675] sata_nv 0000:00:05.1: Using SWNCQ mode
> [    3.156582] scsi2 : sata_nv
> [    3.160553] scsi3 : sata_nv
> 
> ie no HD is found, even thought he ata1 link comes up, which of course
> leads to:
> 
> [    4.763274] VFS: Cannot open root device "sda1" or unknown-block(0,0)
> [    4.769724] Please append a correct "root=" boot option; here are the available partitions:
> 
> and the system is dead.
> 
> I did a bisection and came up with 305d2a1a as the culprit.  Then I
> applied the revert patch below by hand (since 305d2a1a doesn't revert
> entirely cleanly), and things worked again:

Thanks for the bisection.  Hmmm... it's not supposed to change probe 
behavior (well, of course).  I'll try to reproduce the problem here and 
report back.

-- 
tejun
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