tree 71dfcf330e5dc1faec9c7a54b235d700fc9df68d
parent e47373ec1c9aab9ee134f4e2b8249957e9f4c7ef
author Alan Stern <stern@rowland.harvard.edu> 1121179517 -0400
committer James Bottomley <jejb@mulgrave.(none)> 1126045313 -0500

[SCSI] sd: pause in sd_spinup_disk for slow USB devices

This patch adds a delay tailored for USB flash devices that are slow to
initialize their firmware.  The symptom is a repeated Unit Attention with
ASC=0x28 (Not Ready to Ready transition).  The patch will wait for up to 5
seconds for such devices to become ready.  Normal devices won't send the
repeated Unit Attention sense key and hence won't trigger the patch.

This fixes a problem with James Roberts-Thomson's USB device, and I've
seen several reports of other devices exhibiting the same symptoms --
presumably they will be helped as well.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>