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author | 2020-03-05 11:03:23 +0100 | |
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committer | 2020-03-05 09:42:23 -0600 | |
commit | 2f69a110e7bba3ec6bc089a2f736ca0941d887ed (patch) | |
tree | 57ffc62e0497d2f1be6ad89f9abd7c8adbdde722 /drivers/block/xen-blkfront.c | |
parent | xenbus: req->err should be updated before req->state (diff) | |
download | linux-dev-2f69a110e7bba3ec6bc089a2f736ca0941d887ed.tar.xz linux-dev-2f69a110e7bba3ec6bc089a2f736ca0941d887ed.zip |
xen/xenbus: fix locking
Commit 060eabe8fbe726 ("xenbus/backend: Protect xenbus callback with
lock") introduced a bug by holding a lock while calling a function
which might schedule.
Fix that by using a semaphore instead.
Fixes: 060eabe8fbe726 ("xenbus/backend: Protect xenbus callback with lock")
Signed-off-by: Juergen Gross <jgross@suse.com>
Link: https://lore.kernel.org/r/20200305100323.16736-1-jgross@suse.com
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
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