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authorDarrick J. Wong <djwong@us.ibm.com>2007-01-30 12:07:27 -0800
committerJames Bottomley <jejb@mulgrave.il.steeleye.com>2007-02-03 08:15:15 -0600
commit423f7cf467045eab616f97309aed87a54b5e351d (patch)
tree32d1b6fdb65dfa0816bf176bfdf1df2257caa563 /include/scsi
parent9abe16c670bd3d4ab5519257514f9f291383d104 (diff)
[SCSI] libsas: Don't BUG when connecting two expanders via wide port
libsas: Don't BUG when connecting two expanders via wide port When a device is connected to an expander, the discovery process goes through sas_ex_discover_dev to figure out what's attached to the phy. If it is the case that the phy being discovered happens to be the second phy of a wide link to an expander, that discover_dev function will incorrectly call sas_ex_discover_expander, which creates another sas_port and tries to attach the other sas_phys to the new port, thus triggering a BUG. The correct thing to do is to check the other ex_phys of the expander to see if there's a sas_port for this sas_phy, and attach the sas_phy to the existing sas_port. This is easily triggered if one enables the phys of a wide port between expanders one by one. This second version of the patch fixes a small regression in the case where all the phys show up at once and we accidentally try to attach to a port that hasn't been created yet. Signed-off-by: Darrick J. Wong <djwong@us.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
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