Matthew R. Ochs a5ed99bc6f scsi: cxlflash: Avoid clobbering context control register value ... [ Upstream commit 465891fe92 ] The SISLite specification originally defined the context control register with a single field of bits to represent the LISN and also stipulated that the register reset value be 0. The cxlflash driver took advantage of this when programming the LISN for the master contexts via an unconditional write - no other bits were preserved. When unmap support was added, SISLite was updated to define bit 0 of the context control register as a way for the AFU to notify the context owner that unmap operations were supported. Thus the assumptions under which the register is setup changed and the existing unconditional write is clobbering the unmap state for master contexts. This is presently not an issue due to the order in which the context control register is programmed in relation to the unmap bit being queried but should be addressed to avoid a future regression in the event this code is moved elsewhere. To remedy this issue, preserve the bits when programming the LISN field in the context control register. Since the LISN will now be programmed using a read value, assert that the initial state of the LISN field is as described in SISLite (0). Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2018-08-03 07:50:41 +02:00
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Kconfig	scsi: cxlflash: Select IRQ_POLL	2017-05-08 22:09:21 -04:00
Makefile	cxlflash: Virtual LUN support	2015-08-26 18:05:39 -07:00
common.h	scsi: cxlflash: Remove zeroing of private command data	2017-06-26 15:01:13 -04:00
lunmgt.c	scsi: cxlflash: Remove port configuration assumptions	2017-04-13 22:55:41 -04:00
main.c	scsi: cxlflash: Avoid clobbering context control register value	2018-08-03 07:50:41 +02:00
main.h	scsi: cxlflash: Support AFU debug	2017-06-26 15:01:12 -04:00
sislite.h	scsi: cxlflash: Avoid clobbering context control register value	2018-08-03 07:50:41 +02:00
superpipe.c	scsi: cxlflash: Avoid double mutex unlock	2017-08-25 18:23:34 -04:00
superpipe.h	scsi: cxlflash: Fix warnings/errors	2017-04-13 22:55:41 -04:00
vlun.c	scsi: cxlflash: Fix vlun resize failure in the shrink path	2017-08-25 18:24:04 -04:00
vlun.h	scsi: cxlflash: Fix warnings/errors	2017-04-13 22:55:41 -04:00