diff options
| author | Ming Lei <ming.lei@redhat.com> | 2019-06-18 09:37:56 +0800 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2019-06-20 15:21:33 -0400 |
| commit | c3c0fd9b108f6360ceaade790571be097df1f3ef (patch) | |
| tree | d88abce8136c9a1055f2aee801cee27b0ab65201 /drivers/scsi/wd33c93.c | |
| parent | 57ef4e510939e305ad905cc54b8031401ff5450e (diff) | |
| download | linux-c3c0fd9b108f6360ceaade790571be097df1f3ef.tar.gz linux-c3c0fd9b108f6360ceaade790571be097df1f3ef.tar.bz2 linux-c3c0fd9b108f6360ceaade790571be097df1f3ef.zip | |
scsi: wd33c93: use sg helper to iterate over scatterlist
Unlike the legacy I/O path, scsi-mq preallocates a large array to hold
the scatterlist for each request. This static allocation can consume
substantial amounts of memory on modern controllers which support a
large number of concurrently outstanding requests.
To facilitate a switch to a smaller static allocation combined with a
dynamic allocation for requests that need it, we need to make sure all
SCSI drivers handle chained scatterlists correctly.
Convert remaining drivers that directly dereference the scatterlist
array to using the iterator functions.
[mkp: clarified commit message]
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/wd33c93.c')
| -rw-r--r-- | drivers/scsi/wd33c93.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/scsi/wd33c93.c b/drivers/scsi/wd33c93.c index 74be04f2357c..ae5935c0a149 100644 --- a/drivers/scsi/wd33c93.c +++ b/drivers/scsi/wd33c93.c @@ -744,7 +744,7 @@ transfer_bytes(const wd33c93_regs regs, struct scsi_cmnd *cmd, * source or destination for THIS transfer. */ if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { - ++cmd->SCp.buffer; + cmd->SCp.buffer = sg_next(cmd->SCp.buffer); --cmd->SCp.buffers_residual; cmd->SCp.this_residual = cmd->SCp.buffer->length; cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); |