Commit e2c7b433 authored Jun 23, 2017 by Yadan Fan Committed by Martin K. Petersen Jul 17, 2017

scsi: hpsa: limit transfer length to 1MB



The hpsa firmware will bypass the cache for any request larger than 1MB,
so we should cap the request size to avoid any performance degradation
in kernels later than v4.3

This degradation is caused from d2be537c,
which changed max_sectors_kb to 1280k, but the hardware is able to work
fine with it, so the true fix should be from hpsa driver.

Signed-off-by: Yadan Fan <ydfan@suse.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Acked-by: Don Brace <don.brace@microsemi.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

parent 6f37e210

drivers/scsi/hpsa.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -938,7 +938,7 @@ static struct scsi_host_template hpsa_driver_template = {
		#endif
		.sdev_attrs = hpsa_sdev_attrs,
		.shost_attrs = hpsa_shost_attrs,
		.max_sectors = 8192,
		.max_sectors = 1024,
		.no_write_same = 1,
		};

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