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| author | Finn Thain <fthain@telegraphics.com.au> | 2016-10-10 00:46:52 -0400 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2016-11-08 17:29:48 -0500 |
| commit | 4822827a69d7cd3bc5a07b7637484ebd2cf88db6 (patch) | |
| tree | f34e1a764d477da5cd1fdc0bf08bd737e95c9a71 /drivers/scsi/NCR5380.h | |
| parent | d4408dd7ecff6ed3561f155923738474c585f31d (diff) | |
| download | linux-4822827a69d7cd3bc5a07b7637484ebd2cf88db6.tar.gz linux-4822827a69d7cd3bc5a07b7637484ebd2cf88db6.tar.bz2 linux-4822827a69d7cd3bc5a07b7637484ebd2cf88db6.zip | |
scsi: ncr5380: Increase register polling limit
If NCR5380_poll_politely() is called under irq lock, the polling time
limit is clamped to avoid a spike in interrupt latency. When not under
irq lock, the same polling time limit acts as the worst case delay
between schedule() calls.
During PDMA (under irq lock) I've found that the 10 ms time limit is
sometimes too short, and leads to the error message,
sd 0:0:0:0: [sda] tag#1 macscsi_pread: !REQ and !ACK
This particular target identifies itself as a QUANTUM DAYTONA514S. It
seems to be slower to assert ACK than the other targets I've tested.
This patch solves the problem by increasing the polling timeout.
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Tested-by: Ondrej Zary <linux@rainbow-software.org>
Tested-by: Michael Schmitz <schmitzmic@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/NCR5380.h')
| -rw-r--r-- | drivers/scsi/NCR5380.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/scsi/NCR5380.h b/drivers/scsi/NCR5380.h index cbb29d604fe0..f0eea44107d2 100644 --- a/drivers/scsi/NCR5380.h +++ b/drivers/scsi/NCR5380.h @@ -253,7 +253,7 @@ struct NCR5380_cmd { #define NCR5380_PIO_CHUNK_SIZE 256 /* Time limit (ms) to poll registers when IRQs are disabled, e.g. during PDMA */ -#define NCR5380_REG_POLL_TIME 10 +#define NCR5380_REG_POLL_TIME 15 static inline struct scsi_cmnd *NCR5380_to_scmd(struct NCR5380_cmd *ncmd_ptr) { |