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Jan Höppner f176cd6084 s390/dasd: Fix zero write for FBA devices

commit 709192d531 upstream.

A discard request that writes zeros using the global kernel internal
ZERO_PAGE will fail for machines with more than 2GB of memory due to the
location of the ZERO_PAGE.

Fix this by using a driver owned global zero page allocated with GFP_DMA
flag set.

Fixes: 28b841b3a7 ("s390/dasd: Add discard support for FBA devices")
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
Reviewed-by: Stefan Haberland <sth@linux.ibm.com>
Cc: <stable@vger.kernel.org> # 4.14+
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2020-10-01 17:36:33 +02:00

dasd_3990_erp.c

s390/dasd: Fix comment spelling

2020-03-17 20:50:19 +01:00

dasd_alias.c

s390/dasd: fix endless loop after read unit address configuration

2019-08-01 20:46:14 -06:00

dasd_devmap.c

…

dasd_diag.c

s390/dasd: fix inability to use DASD with DIAG driver

2020-08-19 08:27:09 +02:00