possible esata regression in 2.6.35

[Nicolas Jungers <nicolas@jungers.net>]

My arm box doesn't succeed to use my esata port multiplier (addonics 
sil3726 based).  It was working well with 2.6.34.1 and 2.6.34.4 but not 
with both 2.6.35.2 and 2.6.35.3.  I haven't test other kernels.

The kernels are from http://sheeva.with-linux.com/sheeva/ with for 
example the following config 
http://sheeva.with-linux.com/sheeva/2.6.35.3/sheeva-2.6.35.3.config

The symptoms are in the console a loop on the esata links.  Here is the 
start of it:

ata2: exception Emask 0x10 SAct 0x0 SErr 0x4010000 action 0xe frozen
ata2: edma_err_cause=00000010 pp_flags=00000000, dev connect
ata2: SError: { PHYRdyChg DevExch }
ata2: hard resetting link
ata2: SATA link up 3.0 Gbps (SStatus 123 SControl F300)
ata2.15: Port Multiplier 1.1, 0x1095:0x3726 r23, 6 ports, feat 0x1/0x9
ata2.00: hard resetting link
ata2.01: hard resetting link
ata2.02: hard resetting link
ata2.03: hard resetting link
ata2.04: hard resetting link
ata2.05: hard resetting link
ata2.00: qc timeout (cmd 0xec)
ata2.00: failed to IDENTIFY (I/O error, err_mask=0x4)
ata2.15: hard resetting link
ata2.15: SATA link up 3.0 Gbps (SStatus 123 SControl F300)
ata2.00: hard resetting link
ata2.01: hard resetting link
ata2.02: hard resetting link
ata2.04: hard resetting link
ata2.05: hard resetting link
ata2.00: qc timeout (cmd 0xec)
ata2.00: failed to IDENTIFY (I/O error, err_mask=0x4)
ata2.15: hard resetting link
ata2.15: SATA link up 3.0 Gbps (SStatus 123 SControl F300)
ata2.00: hard resetting link
ata2.01: hard resetting link
ata2.02: hard resetting link
ata2.03: hard resetting link
ata2.04: hard resetting link
ata2.05: hard resetting link
ata2.00: qc timeout (cmd 0xec)
ata2.00: failed to IDENTIFY (I/O error, err_mask=0x4)
ata2.00: failed to recover link after 3 tries, disabling
ata2.15: hard resetting link
ata2.15: SATA link up 3.0 Gbps (SStatus 123 SControl F300)

N.