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ia64/err-inject: Use get_user_pages_fast()
[ Upstream commit 69c907022a
]
At the point of sysfs callback, the call to gup is
done without mmap_sem (or any lock for that matter).
This is racy. As such, use the get_user_pages_fast()
alternative and safely avoid taking the lock, if possible.
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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1 changed files with 1 additions and 1 deletions
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@ -142,7 +142,7 @@ store_virtual_to_phys(struct device *dev, struct device_attribute *attr,
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u64 virt_addr=simple_strtoull(buf, NULL, 16);
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int ret;
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ret = get_user_pages(virt_addr, 1, FOLL_WRITE, NULL, NULL);
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ret = get_user_pages_fast(virt_addr, 1, FOLL_WRITE, NULL);
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if (ret<=0) {
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#ifdef ERR_INJ_DEBUG
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printk("Virtual address %lx is not existing.\n",virt_addr);
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