[SCSI] qla4xxx: Reduce rom-lock contention during reset recovery.

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Issue:
Driver holds rom-lock for too long during reset recovery.

During adapter reset testing, it was found that the driver
holds the rom-lock for too long, because of which other
drivers fail to acquire the rom-lock, leading to reset
failures.
The primary cause is, in the bootstrap code, while
holding the rom-lock, the driver checks if the peg is
halted, causing a 2 second contention.

Fix:
When a reset recovery starts, the driver deduces the cause, and
sets appropriate flags in watchdog & recover_adapter routines.
This flag should be used to determine if bootstrap is invoked
from probe or reset context, reducing the rom-lock footprint of
the drivers.

Signed-off-by: Vikas Chaudhary <vikas.chaudhary@qlogic.com>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

...

This commit is contained in:

Vikas Chaudhary 2013-12-16 06:49:45 -05:00 • committed by James Bottomley

parent 58e2bbe985

commit 4ebbb5cf64

1 changed files with 12 additions and 21 deletions

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33

drivers/scsi/qla4xxx/ql4_nx.c

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