scsi: ufs: Remove locking from around single register writes

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Single register writes are atomic and hence do not need to be surrounded by
locking. Additionally, MMIO writes are typically posted asynchronously.
Hence, there is no guarantee that these have finished by the time the
spin_unlock*() call has finished. See also the nonposted-mmio property of
the Open Firmware tree. See also pci_iomap().

Link: https://lore.kernel.org/r/20220419225811.4127248-21-bvanassche@acm.org
Tested-by: Bean Huo <beanhuo@micron.com>
Reviewed-by: Avri Altman <avri.altman@wdc.com>
Reviewed-by: Bean Huo <beanhuo@micron.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

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Bart Van Assche 2022-04-19 15:58:03 -07:00 • committed by Martin K. Petersen

parent 21c2e3418d

commit 3fb20fcd93

2 changed files with 0 additions and 12 deletions

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8

drivers/scsi/ufs/ufs-mediatek.c

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4

drivers/scsi/ufs/ufshcd.c

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