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scsi: arcmsr: Fix doorbell status being updated late on ARC-1886
[ Upstream commit d9a2312 ] It is possible for the IOP to be delayed in updating the doorbell status. The doorbell status should not be 0 so loop until the value changes. Link: https://lore.kernel.org/r/afdfdf7eabecf14632492c4987a6b9ac6312a7ad.camel@areca.com.tw Signed-off-by: ching Huang <ching2048@areca.com.tw> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
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