ahci_host_intr BUG

[Meelis Roos <mroos@linux.ee>]

Background: I have a yet-unidentified problem with 2 HDD-s that are very 
slow and often time out. They are connected to Intel ICH5R SATA 
controller. I tried with both ata_piix and ahci drivers. I 2.6.15 era 
driver, any such SATA error hung up the disk. In 2.6.17 (Debian 
2.6.17-2-686 kernel, package version 2.6.17-7) the errors are handled 
much better, woprk is resumed after timeout. ata_piix just logs the 
messages about timeout, drive being { Busy} and then reset and continue. 
AHCI driver on the other hand logs this on every error but then 
continues fine (albeit slowly):

Info fld=0xb530a4
ata1: handling error/timeout
ata1: port reset, p_is 0 is 0 pis 0 cmd 4017 tf d0 ss 113 se 0
BUG: warning at drivers/scsi/ahci.c:853/ahci_host_intr()
 <f003945c> ahci_interrupt+0xda/0x1b5 [ahci]  <b0139ada> handle_IRQ_event+0x23/0x4c
 <b0139b81> __do_IRQ+0x7e/0xd1  <b0104fe1> do_IRQ+0x19/0x24
 <b0103592> common_interrupt+0x1a/0x20  <b0120a49> __do_softirq+0x4f/0xc2
 <b0120aea> do_softirq+0x2e/0x32  <b0103620> apic_timer_interrupt+0x1c/0x24
 <b0271d13> _spin_unlock_irqrestore+0x6/0x7  <f003960d> ahci_eng_timeout+0x65/0x71 [ahci]
 <f004aad8> ata_scsi_error+0x8c/0xe8 [libata]  <f005d213> scsi_error_handler+0xab/0xa4a [scsi_mod]
 <f005d168> scsi_error_handler+0x0/0xa4a [scsi_mod]  <b012c1e6> kthread+0x9f/0xcb
 <b012c147> kthread+0x0/0xcb  <b0101005> kernel_thread_helper+0x5/0xb
BUG: warning at drivers/scsi/ahci.c:853/ahci_host_intr()
 <f003945c> ahci_interrupt+0xda/0x1b5 [ahci]  <b0139ada> handle_IRQ_event+0x23/0x4c
 <b0139b81> __do_IRQ+0x7e/0xd1  <b0104fe1> do_IRQ+0x19/0x24
 <b0103592> common_interrupt+0x1a/0x20  <b0101eaf> mwait_idle+0x1f/0x34
 <b0101e77> cpu_idle+0x8f/0xa8
ata1: status=0x50 { DriveReady SeekComplete }
sda: Current: sense key: No Sense
    Additional sense: No additional sense information


--
Meelis Roos (mroos@linux.ee)
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