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dm ioctl: restore __GFP_HIGH in copy_params() 

Commit d224e93818 ("drivers/md/dm-ioctl.c: use kvmalloc rather than
opencoded variant") left out the __GFP_HIGH flag when converting from
__vmalloc to kvmalloc.  This can cause the DM ioctl to fail in some low
memory situations where it wouldn't have failed earlier.  Add __GFP_HIGH
back to avoid any potential regression.

Fixes: d224e93818 ("drivers/md/dm-ioctl.c: use kvmalloc rather than opencoded variant")
Signed-off-by: Junaid Shahid <junaids@google.com>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Junaid Shahid 2017-05-18 12:00:51 -07:00 committed by Mike Snitzer
parent 702a6204f8
commit 8c1e2162f2
1 changed files with 3 additions and 2 deletions
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5
drivers/md/dm-ioctl.c
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@ -1710,12 +1710,13 @@ static int copy_params(struct dm_ioctl __user *user, struct dm_ioctl *param_kern
}
/*
* Try to avoid low memory issues when a device is suspended.
* Use __GFP_HIGH to avoid low memory issues when a device is
* suspended and the ioctl is needed to resume it.
* Use kmalloc() rather than vmalloc() when we can.
*/
dmi = NULL;
noio_flag = memalloc_noio_save();
dmi = kvmalloc(param_kernel->data_size, GFP_KERNEL);
dmi = kvmalloc(param_kernel->data_size, GFP_KERNEL | __GFP_HIGH);
memalloc_noio_restore(noio_flag);
if (!dmi) {