linux/drivers/scsi/ufs
Subhash Jadavani 38135535dc scsi: ufs: add reference counting for scsi block requests
Currently we call the scsi_block_requests()/scsi_unblock_requests()
whenever we want to block/unblock scsi requests but as there is no
reference counting, nesting of these calls could leave us in undesired
state sometime. Consider following call flow sequence:

1. func1() calls scsi_block_requests() but calls func2() before
   calling scsi_unblock_requests()
2. func2() calls scsi_block_requests()
3. func2() calls scsi_unblock_requests()
4. func1() calls scsi_unblock_requests()

As there is no reference counting, we will have scsi requests unblocked
after #3 instead of it to be unblocked only after #4. Though we may not
have failures seen with this, we might run into some failures in future.
Better solution would be to fix this by adding reference counting.

Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Can Guo <cang@codeaurora.org>
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-05-18 12:20:48 -04:00
..
Kconfig
Makefile scsi: ufs: sysfs: attribute group for existing sysfs entries. 2018-02-15 18:34:24 -05:00
tc-dwc-g210-pci.c scsi: ufs: Fix kernel-doc errors and warnings 2018-03-01 21:00:23 -05:00
tc-dwc-g210-pltfrm.c scsi: ufs: Fix kernel-doc errors and warnings 2018-03-01 21:00:23 -05:00
tc-dwc-g210.c scsi: ufs: tc-dwc-g210: make arrays static, reduces object code size 2017-09-15 15:41:45 -04:00
tc-dwc-g210.h
ufs_quirks.h
ufs-qcom.c SCSI misc on 20171114 2017-11-14 16:23:44 -08:00
ufs-qcom.h scsi: ufs-qcom: Remove uses of UFS_BIT() macro 2017-10-11 13:44:31 -04:00
ufs-sysfs.c scsi: ufs: Add support for Auto-Hibernate Idle Timer 2018-03-21 21:21:25 -04:00
ufs-sysfs.h scsi: ufs: sysfs: attributes 2018-02-15 18:35:05 -05:00
ufs.h scsi: ufs: sysfs: attributes 2018-02-15 18:35:05 -05:00
ufshcd-dwc.c
ufshcd-dwc.h
ufshcd-pci.c scsi: ufs: Fix kernel-doc errors and warnings 2018-03-01 21:00:23 -05:00
ufshcd-pltfrm.c
ufshcd-pltfrm.h
ufshcd.c scsi: ufs: add reference counting for scsi block requests 2018-05-18 12:20:48 -04:00
ufshcd.h scsi: ufs: add reference counting for scsi block requests 2018-05-18 12:20:48 -04:00
ufshci-dwc.h
ufshci.h scsi: ufs: Add support for Auto-Hibernate Idle Timer 2018-03-21 21:21:25 -04:00
unipro.h