[lkml]   [2011]   [Jun]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: libata/ipr/powerpc: regression between 2.6.39-rc4 and 2.6.39-rc5
On 06/15/2011 02:17 PM, Nishanth Aravamudan wrote:
> From what I can tell, the only place that explicitly clears the FROZEN
> flag is the error-handling code via ata_eh_thaw_port().
> So I thought either we're not invoking the error-handler at probe time
> correctly to kick the port or perhaps the SAS code is not clearing the
> flag?
> I tried the following patch:
> diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
> index d51f979..abd0e0b 100644
> --- a/drivers/ata/libata-scsi.c
> +++ b/drivers/ata/libata-scsi.c
> @@ -3797,6 +3797,7 @@ EXPORT_SYMBOL_GPL(ata_sas_port_alloc);
> */
> int ata_sas_port_start(struct ata_port *ap)
> {
> + ap->pflags &= ~ATA_PFLAG_FROZEN;
> return 0;
> }
> EXPORT_SYMBOL_GPL(ata_sas_port_start);
> and the CD-ROM drive works, but I have no idea if it's the right thing
> to do. I chose this particular change, FWIW, because we call
> ata_sas_port_start before we probe in ata_sas_port_init and it seems
> like we need to mark the port as not frozen before we init it? Perhaps
> that should really be a call to a thaw function, not sure. Let's just
> say the ATA/SAS/SCSI interactions are a bit hard to follow at first :)

That looks like the right thing to do. For ipr's usage of
libata, we don't have the concept of a port frozen state, so this flag
should really never get set. The alternate way to fix this would be to
only set ATA_PFLAG_FROZEN in ata_port_alloc if ap->ops->error_handler
is not NULL.



Brian King
Linux on Power Virtualization
IBM Linux Technology Center

 \ /
  Last update: 2011-06-15 22:05    [W:0.054 / U:11.164 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site