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bi_end_io functions must be IRQ-safe. A quote from a discussion between Alan Cox, Mikulas Patocka and Jens Axboe (http://lkml.org/lkml/2008/7/2/69): > >Right, that wont work of course. Completions are typically done through > >a softirq, so it is not currently done with hard interrupts disabled. > > I thought, from hardirq - that's what IDE is doing. And they are called > with interrupts disabled (maybe unless you specify unmaskirq, which is not > default). What block driver does completions with softirq? ... and why? The key word is 'typically', the old IDE driver really isn't used very much. The SCSI layer and eg cciss uses the block layer softirq completions, so that is what 99% of the uses will be. The patch itself was provided by Arne Redlich. git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@2913 d57e44dd-8a1f-0410-8b47-8ef2f437770f
This is the SCST development repository. It contains not a single project SCST as one can think, but a number of them, which are divided as the following: 1. SCST core in scst/ subdirectory 2. Administration utility for SCST core scstadmin in scstadmin/ 3. Target drivers in own subdirectories qla2x00t/, iscsi-scst/, etc. 4. User space programs in usr/ subdirectory, like fileio_tgt. 5. Some various docs in doc/ subdirectory. Those subprojects are in most cases independent from each other, although some of them depend from the SCST core. They put in the single repository only to simplify their development, they are released independently. Thus, use "make all" only if you really need to build everything. Otherwise build only what you need, like for iSCSI-SCST: make scst scst_install iscsi iscsi_install For more information about each subproject see their README files. Vladislav Bolkhovitin <vst@vlnb.net>, http://scst.sourceforge.net