6.6-stable review patch. If anyone has any objections, please let me know.
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From: Stefan Haberland sth@linux.ibm.com
commit c943bfc6afb8d0e781b9b7406f36caa8bbf95cb9 upstream.
After a copy pair swap the block device's "device" symlink points to the secondary CCW device, but the gendisk's parent remained the primary, leaving /sys/block/<dasdx> under the wrong parent.
Move the gendisk to the secondary's device with device_move(), keeping the sysfs topology consistent after the swap.
Fixes: 413862caad6f ("s390/dasd: add copy pair swap capability") Cc: stable@vger.kernel.org #6.1 Reviewed-by: Jan Hoeppner hoeppner@linux.ibm.com Signed-off-by: Stefan Haberland sth@linux.ibm.com Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/s390/block/dasd_eckd.c | 8 ++++++++ 1 file changed, 8 insertions(+)
--- a/drivers/s390/block/dasd_eckd.c +++ b/drivers/s390/block/dasd_eckd.c @@ -6189,6 +6189,7 @@ static int dasd_eckd_copy_pair_swap(stru struct dasd_copy_relation *copy; struct dasd_block *block; struct gendisk *gdp; + int rc;
copy = device->copy; if (!copy) @@ -6223,6 +6224,13 @@ static int dasd_eckd_copy_pair_swap(stru /* swap blocklayer device link */ gdp = block->gdp; dasd_add_link_to_gendisk(gdp, secondary); + rc = device_move(disk_to_dev(gdp), &secondary->cdev->dev, DPM_ORDER_NONE); + if (rc) { + dev_err(&primary->cdev->dev, + "copy_pair_swap: moving blockdevice parent %s->%s failed (%d)\n", + dev_name(&primary->cdev->dev), + dev_name(&secondary->cdev->dev), rc); + }
/* re-enable device */ dasd_device_remove_stop_bits(primary, DASD_STOPPED_PPRC);