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ioat_reserve_space: Recheck quiescing flag after dropping submit lock

Description

ioat_reserve_space: Recheck quiescing flag after dropping submit lock

Fix a minor bound check error while here (ring can only hold 1 <<
MAX_ORDER - 1 entries).

Details

Provenance
cemAuthored on
Parents
rS302681: ioat(4): Remove force_hw_error sysctl; it does not work reliably
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