Jan Höppner 9ab4bc95f4 s390/dasd: Fix zero write for FBA devices ...

commit 709192d531e5b0a91f20aa14abfe2fc27ddd47af 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 13:14:53 +02:00

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dasd_3990_erp.c

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dasd_alias.c

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dasd_devmap.c

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dasd_diag.c

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dasd_diag.h

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dasd_eckd.c

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dasd_eckd.h

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dasd_eer.c

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dasd_erp.c

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dasd_fba.c

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dasd_fba.h

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dasd_genhd.c

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dasd_int.h

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dasd_ioctl.c

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dasd_proc.c

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dasd.c

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dcssblk.c

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Kconfig

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Makefile

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scm_blk.c

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scm_blk.h

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scm_drv.c

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xpram.c

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